Re: [Qgis-user] True North

2018-04-04 Thread Alexandre Neto 
Hi,

Is this what you need?

http://plugins.qgis.org/plugins/AzimuthDistanceCalculator/version/2.0/

Just stumbled on the description of this plugin and it mention that it can
calculate the convergence for UTM.

Hope it helps.

Alexandre Neto

A qua, 4/04/2018, 22:56, Springfield Harrison 
escreveu:

> hello Kristian,
>
> Thanks again for your help, I was partially successful. The second grid,
> the custom Mercator one that you described is not happy in the print
> composer. It does not persist but seems to revert back to the UTM grid with
> the word change on the CRS button.
>
> Not sure what that is all about but my main requirement is to be able to
> draw lines at specific angles with reference to true north. They will then
> be re -projected correctly based on the display projection. Unfortunately,
> the advanced digitizing tool does not work with Geographic projections, IE
> un projected Maps.
>
> If I can get lines that are guaranteed to be related to Geographic
> bearings, I could let the projection quirks sort themselves out on their
> own.
>
> If you have any thoughts on this I would be most appreciative...
>
> Cheers . . . . .   Spring
> Samsung Tab 4
> On Apr 4, 2018 9:41 AM, "Springfield Harrison" 
> wrote:
>
>> Okay, great. That is very helpful, I will work in the map composer. I
>> know what you are referring to there. Thanks again...
>>
>> Cheers . . . . .   Spring
>> Samsung Tab 4
>> On Apr 4, 2018 9:36 AM, "Kristian Evers"  wrote:
>>
>>> I made it within the Layout Composer/Editor (what it’s called in QGIS3
>>> escapes me now – it used to be Map Composer in 2.x). That was the simplest
>>> way to achieve it quickly I found. You have the possibility to add more
>>> than one graticule and you can also change the CRS of the graticule. That
>>> is what I did. One was kept in UTM, the other used my custom Mercator CRS.
>>>
>>>
>>>
>>> This is just one way of doing it. There many ways to achieve the same
>>> thing, but this should outline the general idea at least.
>>>
>>>
>>>
>>> My last post was not let through to the mailing list, so here’s a copy
>>> of the image I attached in the previous mail. Should anyone be interested…
>>>
>>>
>>>
>>> /Kristian
>>>
>>>
>>>
>>>
>>>
>>> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
>>> *Sendt:* 4. april 2018 16:19
>>> *Til:* Kristian Evers 
>>> *Cc:* qgis-user 
>>> *Emne:* Re: SV: [Qgis-user] True North
>>>
>>>
>>>
>>> Right, this looks promising.
>>>
>>> I have been changing projections and then enabling the grid decoration
>>> which is always oriented straight up regardless of the projection.
>>>
>>> I assume that you were inserting your grids as a vector feature using a
>>> drawing tool?
>>>
>>> What was the CRS of the grid layer? I have been changing the project
>>> projection with OTF on. Maybe I should be adjusting the projection of the
>>> layer in question?
>>>
>>> Thanks again . . .
>>>
>>> Cheers . . . . .   Spring
>>> Samsung Tab 4
>>>
>>> On Apr 4, 2018 5:23 AM, "Kristian Evers"  wrote:
>>>
>>> I had a quick go at it after I wrote the email. What I did was to first
>>> create a custom projection with the proj-string “+proj=merc”. Then I opened
>>> the layout editor, inserted my map and added to sets of grid lines to the
>>> map. One of them was left with the original CRS (the UTM one) and for the
>>> other I used my custom CRS. This immediately gave me two grids, one where
>>> the meridians is oriented at the grid north (black in the attached image)
>>> and one oriented at true north (red in the attached image).
>>>
>>>
>>>
>>> /Kristian
>>>
>>>
>>>
>>> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
>>> *Sendt:* 3. april 2018 22:52
>>> *Til:* qgis-user@lists.osgeo.org; Kristian Evers 
>>> *Emne:* Re: [Qgis-user] True North
>>>
>>>
>>>
>>> OK, that sounds like the solution I'm looking for.
>>>
>>> It sounds like the answer is to draw the lines in one projection and
>>> then transform it to the other, depending upon which orientation is desired
>>> for those lines.
>>>
>>> I hope I have this correct…
>>>
>>> Cheers . . . . . Springfield Harrison
>>>

Re: [Qgis-user] True North

2018-04-04 Thread Springfield Harrison 
hello Kristian,

Thanks again for your help, I was partially successful. The second grid,
the custom Mercator one that you described is not happy in the print
composer. It does not persist but seems to revert back to the UTM grid with
the word change on the CRS button.

Not sure what that is all about but my main requirement is to be able to
draw lines at specific angles with reference to true north. They will then
be re -projected correctly based on the display projection. Unfortunately,
the advanced digitizing tool does not work with Geographic projections, IE
un projected Maps.

If I can get lines that are guaranteed to be related to Geographic
bearings, I could let the projection quirks sort themselves out on their
own.

If you have any thoughts on this I would be most appreciative...

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 9:41 AM, "Springfield Harrison"  wrote:

> Okay, great. That is very helpful, I will work in the map composer. I know
> what you are referring to there. Thanks again...
>
> Cheers . . . . .   Spring
> Samsung Tab 4
> On Apr 4, 2018 9:36 AM, "Kristian Evers"  wrote:
>
>> I made it within the Layout Composer/Editor (what it’s called in QGIS3
>> escapes me now – it used to be Map Composer in 2.x). That was the simplest
>> way to achieve it quickly I found. You have the possibility to add more
>> than one graticule and you can also change the CRS of the graticule. That
>> is what I did. One was kept in UTM, the other used my custom Mercator CRS.
>>
>>
>>
>> This is just one way of doing it. There many ways to achieve the same
>> thing, but this should outline the general idea at least.
>>
>>
>>
>> My last post was not let through to the mailing list, so here’s a copy of
>> the image I attached in the previous mail. Should anyone be interested…
>>
>>
>>
>> /Kristian
>>
>>
>>
>>
>>
>> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
>> *Sendt:* 4. april 2018 16:19
>> *Til:* Kristian Evers 
>> *Cc:* qgis-user 
>> *Emne:* Re: SV: [Qgis-user] True North
>>
>>
>>
>> Right, this looks promising.
>>
>> I have been changing projections and then enabling the grid decoration
>> which is always oriented straight up regardless of the projection.
>>
>> I assume that you were inserting your grids as a vector feature using a
>> drawing tool?
>>
>> What was the CRS of the grid layer? I have been changing the project
>> projection with OTF on. Maybe I should be adjusting the projection of the
>> layer in question?
>>
>> Thanks again . . .
>>
>> Cheers . . . . .   Spring
>> Samsung Tab 4
>>
>> On Apr 4, 2018 5:23 AM, "Kristian Evers"  wrote:
>>
>> I had a quick go at it after I wrote the email. What I did was to first
>> create a custom projection with the proj-string “+proj=merc”. Then I opened
>> the layout editor, inserted my map and added to sets of grid lines to the
>> map. One of them was left with the original CRS (the UTM one) and for the
>> other I used my custom CRS. This immediately gave me two grids, one where
>> the meridians is oriented at the grid north (black in the attached image)
>> and one oriented at true north (red in the attached image).
>>
>>
>>
>> /Kristian
>>
>>
>>
>> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
>> *Sendt:* 3. april 2018 22:52
>> *Til:* qgis-user@lists.osgeo.org; Kristian Evers 
>> *Emne:* Re: [Qgis-user] True North
>>
>>
>>
>> OK, that sounds like the solution I'm looking for.
>>
>> It sounds like the answer is to draw the lines in one projection and then
>> transform it to the other, depending upon which orientation is desired for
>> those lines.
>>
>> I hope I have this correct…
>>
>> Cheers . . . . . Springfield Harrison
>>
>>
>>
>> On 03-Apr-2018 02:46, Kristian Evers wrote:
>>
>> You can use the Mercator projection to digitize true north lines. It is
>> conformal and thus preserves angles. The meridian convergence is 0 (that
>> is, true north == grid north) all over the map. If you then transform those
>> lines to your chosen CRS you should have a set of lines pointing towards
>> true north instead of grid north.
>>
>>
>>
>> /Kristian
>>
>>
>>
>> *Fra:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org
>> ] *På vegne af *Alexandre Neto
>> *Sendt:* 3. april 2018 11:15
>> *Til:* Springfield Harrison  
>> *Cc:* qgis-user  
>> *Emne:* Re: [Qgis-user] True

Re: [Qgis-user] True North

2018-04-04 Thread Kristian Evers 
And the image… https://imgur.com/a/l8Zpq

Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Kristian 
Evers
Sendt: 4. april 2018 16:37
Til: qgis-user@lists.osgeo.org
Emne: Re: [Qgis-user] True North

I made it within the Layout Composer/Editor (what it’s called in QGIS3 escapes 
me now – it used to be Map Composer in 2.x). That was the simplest way to 
achieve it quickly I found. You have the possibility to add more than one 
graticule and you can also change the CRS of the graticule. That is what I did. 
One was kept in UTM, the other used my custom Mercator CRS.

This is just one way of doing it. There many ways to achieve the same thing, 
but this should outline the general idea at least.

My last post was not let through to the mailing list, so here’s a copy of the 
image I attached in the previous mail. Should anyone be interested…

/Kristian


Fra: Springfield Harrison [mailto:stellar...@gmail.com]
Sendt: 4. april 2018 16:19
Til: Kristian Evers mailto:kr...@sdfe.dk>>
Cc: qgis-user mailto:qgis-user@lists.osgeo.org>>
Emne: Re: SV: [Qgis-user] True North


Right, this looks promising.

I have been changing projections and then enabling the grid decoration which is 
always oriented straight up regardless of the projection.

I assume that you were inserting your grids as a vector feature using a drawing 
tool?

What was the CRS of the grid layer? I have been changing the project projection 
with OTF on. Maybe I should be adjusting the projection of the layer in 
question?

Thanks again . . .

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 5:23 AM, "Kristian Evers" mailto:kr...@sdfe.dk>> 
wrote:
I had a quick go at it after I wrote the email. What I did was to first create 
a custom projection with the proj-string “+proj=merc”. Then I opened the layout 
editor, inserted my map and added to sets of grid lines to the map. One of them 
was left with the original CRS (the UTM one) and for the other I used my custom 
CRS. This immediately gave me two grids, one where the meridians is oriented at 
the grid north (black in the attached image) and one oriented at true north 
(red in the attached image).

/Kristian

Fra: Springfield Harrison 
[mailto:stellar...@gmail.com<mailto:stellar...@gmail.com>]
Sendt: 3. april 2018 22:52
Til: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org>; Kristian 
Evers mailto:kr...@sdfe.dk>>
Emne: Re: [Qgis-user] True North

OK, that sounds like the solution I'm looking for.

It sounds like the answer is to draw the lines in one projection and then 
transform it to the other, depending upon which orientation is desired for 
those lines.

I hope I have this correct…
Cheers . . . . . Springfield Harrison


On 03-Apr-2018 02:46, Kristian Evers wrote:
You can use the Mercator projection to digitize true north lines. It is 
conformal and thus preserves angles. The meridian convergence is 0 (that is, 
true north == grid north) all over the map. If you then transform those lines 
to your chosen CRS you should have a set of lines pointing towards true north 
instead of grid north.

/Kristian

Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Alexandre 
Neto
Sendt: 3. april 2018 11:15
Til: Springfield Harrison <mailto:stellar...@gmail.com>
Cc: qgis-user <mailto:qgis-user@lists.osgeo.org>
Emne: Re: [Qgis-user] True North

Maybe something like this :

https://gis.stackexchange.com/q/115531/6191

Alexandre
A ter, 3/04/2018, 10:11, Alexandre Neto 
mailto:senhor.n...@gmail.com>> escreveu:
Ah sorry,

I got lost in translation. You are right, I was talking about the magnetic 
north, not the geodetic one.

Meanwhile,  remembering that all UTM are Transverse Mercator, I don't think 
there's a CRS that will solve you question.

I think you need to use some formula to convert the grid north measures to true 
north according to the CRS, and the latitude and longitude of the place.

Alexandre

A ter, 3/04/2018, 09:25, Springfield Harrison 
mailto:stellar...@gmail.com>> escreveu:

Alexandre,

I believe that true north is actually a constant oriented towards the North 
Pole, i e 90 degrees north latitude. Also where all meridians converge in the 
northern hemisphere.

The other North orientations are magnetic north and grid North and these do 
vary as you suggested.

I do need to use a UTM projection but need bearings to be in degrees true north.

Thanks Alexandre...

Cheers . . . . .   Spring

Samsung Tab 4
On Apr 2, 2018 4:27 PM, "Alexandre Neto" 
mailto:senhor.n...@gmail.com>> wrote:
AFAIK, true bearing differs in time and location because of magnetic 
declination. So I don't think there is a such thing as a CRS with true bearings.

Assuming you are working at regional level, find the magnetic declination for 
that region and remove it from your observations. Then draw the azimuth using 
the chosen CRS. I think 26910 will work just fin

Re: [Qgis-user] True North

2018-04-04 Thread Springfield Harrison 
Okay, great. That is very helpful, I will work in the map composer. I know
what you are referring to there. Thanks again...

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 9:36 AM, "Kristian Evers"  wrote:

> I made it within the Layout Composer/Editor (what it’s called in QGIS3
> escapes me now – it used to be Map Composer in 2.x). That was the simplest
> way to achieve it quickly I found. You have the possibility to add more
> than one graticule and you can also change the CRS of the graticule. That
> is what I did. One was kept in UTM, the other used my custom Mercator CRS.
>
>
>
> This is just one way of doing it. There many ways to achieve the same
> thing, but this should outline the general idea at least.
>
>
>
> My last post was not let through to the mailing list, so here’s a copy of
> the image I attached in the previous mail. Should anyone be interested…
>
>
>
> /Kristian
>
>
>
>
>
> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
> *Sendt:* 4. april 2018 16:19
> *Til:* Kristian Evers 
> *Cc:* qgis-user 
> *Emne:* Re: SV: [Qgis-user] True North
>
>
>
> Right, this looks promising.
>
> I have been changing projections and then enabling the grid decoration
> which is always oriented straight up regardless of the projection.
>
> I assume that you were inserting your grids as a vector feature using a
> drawing tool?
>
> What was the CRS of the grid layer? I have been changing the project
> projection with OTF on. Maybe I should be adjusting the projection of the
> layer in question?
>
> Thanks again . . .
>
> Cheers . . . . .   Spring
> Samsung Tab 4
>
> On Apr 4, 2018 5:23 AM, "Kristian Evers"  wrote:
>
> I had a quick go at it after I wrote the email. What I did was to first
> create a custom projection with the proj-string “+proj=merc”. Then I opened
> the layout editor, inserted my map and added to sets of grid lines to the
> map. One of them was left with the original CRS (the UTM one) and for the
> other I used my custom CRS. This immediately gave me two grids, one where
> the meridians is oriented at the grid north (black in the attached image)
> and one oriented at true north (red in the attached image).
>
>
>
> /Kristian
>
>
>
> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
> *Sendt:* 3. april 2018 22:52
> *Til:* qgis-user@lists.osgeo.org; Kristian Evers 
> *Emne:* Re: [Qgis-user] True North
>
>
>
> OK, that sounds like the solution I'm looking for.
>
> It sounds like the answer is to draw the lines in one projection and then
> transform it to the other, depending upon which orientation is desired for
> those lines.
>
> I hope I have this correct…
>
> Cheers . . . . . Springfield Harrison
>
>
>
> On 03-Apr-2018 02:46, Kristian Evers wrote:
>
> You can use the Mercator projection to digitize true north lines. It is
> conformal and thus preserves angles. The meridian convergence is 0 (that
> is, true north == grid north) all over the map. If you then transform those
> lines to your chosen CRS you should have a set of lines pointing towards
> true north instead of grid north.
>
>
>
> /Kristian
>
>
>
> *Fra:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org
> ] *På vegne af *Alexandre Neto
> *Sendt:* 3. april 2018 11:15
> *Til:* Springfield Harrison  
> *Cc:* qgis-user  
> *Emne:* Re: [Qgis-user] True North
>
>
>
> Maybe something like this :
>
>
>
> https://gis.stackexchange.com/q/115531/6191
>
>
>
> Alexandre
>
> A ter, 3/04/2018, 10:11, Alexandre Neto  escreveu:
>
> Ah sorry,
>
>
>
> I got lost in translation. You are right, I was talking about the magnetic
> north, not the geodetic one.
>
>
>
> Meanwhile,  remembering that all UTM are Transverse Mercator, I don't
> think there's a CRS that will solve you question.
>
>
>
> I think you need to use some formula to convert the grid north measures to
> true north according to the CRS, and the latitude and longitude of the
> place.
>
>
>
> Alexandre
>
>
>
> A ter, 3/04/2018, 09:25, Springfield Harrison 
> escreveu:
>
> Alexandre,
>
> I believe that true north is actually a constant oriented towards the
> North Pole, i e 90 degrees north latitude. Also where all meridians
> converge in the northern hemisphere.
>
> The other North orientations are magnetic north and grid North and these
> do vary as you suggested.
>
> I do need to use a UTM projection but need bearings to be in degrees true
> north.
>
> Thanks Alexandre...
>
> Cheers . . . . .   Spring
>
> Samsung Tab 4
>
> On Apr 2, 2018 4:27

Re: [Qgis-user] True North

2018-04-04 Thread Kristian Evers 
I made it within the Layout Composer/Editor (what it’s called in QGIS3 escapes 
me now – it used to be Map Composer in 2.x). That was the simplest way to 
achieve it quickly I found. You have the possibility to add more than one 
graticule and you can also change the CRS of the graticule. That is what I did. 
One was kept in UTM, the other used my custom Mercator CRS.

This is just one way of doing it. There many ways to achieve the same thing, 
but this should outline the general idea at least.

My last post was not let through to the mailing list, so here’s a copy of the 
image I attached in the previous mail. Should anyone be interested…

/Kristian


Fra: Springfield Harrison [mailto:stellar...@gmail.com]
Sendt: 4. april 2018 16:19
Til: Kristian Evers 
Cc: qgis-user 
Emne: Re: SV: [Qgis-user] True North


Right, this looks promising.

I have been changing projections and then enabling the grid decoration which is 
always oriented straight up regardless of the projection.

I assume that you were inserting your grids as a vector feature using a drawing 
tool?

What was the CRS of the grid layer? I have been changing the project projection 
with OTF on. Maybe I should be adjusting the projection of the layer in 
question?

Thanks again . . .

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 5:23 AM, "Kristian Evers" mailto:kr...@sdfe.dk>> 
wrote:
I had a quick go at it after I wrote the email. What I did was to first create 
a custom projection with the proj-string “+proj=merc”. Then I opened the layout 
editor, inserted my map and added to sets of grid lines to the map. One of them 
was left with the original CRS (the UTM one) and for the other I used my custom 
CRS. This immediately gave me two grids, one where the meridians is oriented at 
the grid north (black in the attached image) and one oriented at true north 
(red in the attached image).

/Kristian

Fra: Springfield Harrison 
[mailto:stellar...@gmail.com<mailto:stellar...@gmail.com>]
Sendt: 3. april 2018 22:52
Til: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org>; Kristian 
Evers mailto:kr...@sdfe.dk>>
Emne: Re: [Qgis-user] True North

OK, that sounds like the solution I'm looking for.

It sounds like the answer is to draw the lines in one projection and then 
transform it to the other, depending upon which orientation is desired for 
those lines.

I hope I have this correct…
Cheers . . . . . Springfield Harrison


On 03-Apr-2018 02:46, Kristian Evers wrote:
You can use the Mercator projection to digitize true north lines. It is 
conformal and thus preserves angles. The meridian convergence is 0 (that is, 
true north == grid north) all over the map. If you then transform those lines 
to your chosen CRS you should have a set of lines pointing towards true north 
instead of grid north.

/Kristian

Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Alexandre 
Neto
Sendt: 3. april 2018 11:15
Til: Springfield Harrison <mailto:stellar...@gmail.com>
Cc: qgis-user <mailto:qgis-user@lists.osgeo.org>
Emne: Re: [Qgis-user] True North

Maybe something like this :

https://gis.stackexchange.com/q/115531/6191

Alexandre
A ter, 3/04/2018, 10:11, Alexandre Neto 
mailto:senhor.n...@gmail.com>> escreveu:
Ah sorry,

I got lost in translation. You are right, I was talking about the magnetic 
north, not the geodetic one.

Meanwhile,  remembering that all UTM are Transverse Mercator, I don't think 
there's a CRS that will solve you question.

I think you need to use some formula to convert the grid north measures to true 
north according to the CRS, and the latitude and longitude of the place.

Alexandre

A ter, 3/04/2018, 09:25, Springfield Harrison 
mailto:stellar...@gmail.com>> escreveu:

Alexandre,

I believe that true north is actually a constant oriented towards the North 
Pole, i e 90 degrees north latitude. Also where all meridians converge in the 
northern hemisphere.

The other North orientations are magnetic north and grid North and these do 
vary as you suggested.

I do need to use a UTM projection but need bearings to be in degrees true north.

Thanks Alexandre...

Cheers . . . . .   Spring

Samsung Tab 4
On Apr 2, 2018 4:27 PM, "Alexandre Neto" 
mailto:senhor.n...@gmail.com>> wrote:
AFAIK, true bearing differs in time and location because of magnetic 
declination. So I don't think there is a such thing as a CRS with true bearings.

Assuming you are working at regional level, find the magnetic declination for 
that region and remove it from your observations. Then draw the azimuth using 
the chosen CRS. I think 26910 will work just fine.

If you are at a larger scale, then you may need to use different magnetic 
declination values for each observation.

This may help:

https://www.ngdc.noaa.gov/geomag/declination.shtml

Best Regards,

Alexandre Neto
A seg, 2/04/2018, 23:54, Springfield Harrison 
mailto:stellar...@gmail.com&g

Re: [Qgis-user] True North

2018-04-04 Thread Springfield Harrison 
Right, this looks promising.

I have been changing projections and then enabling the grid decoration
which is always oriented straight up regardless of the projection.

I assume that you were inserting your grids as a vector feature using a
drawing tool?

What was the CRS of the grid layer? I have been changing the project
projection with OTF on. Maybe I should be adjusting the projection of the
layer in question?

Thanks again . . .

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 5:23 AM, "Kristian Evers"  wrote:

> I had a quick go at it after I wrote the email. What I did was to first
> create a custom projection with the proj-string “+proj=merc”. Then I opened
> the layout editor, inserted my map and added to sets of grid lines to the
> map. One of them was left with the original CRS (the UTM one) and for the
> other I used my custom CRS. This immediately gave me two grids, one where
> the meridians is oriented at the grid north (black in the attached image)
> and one oriented at true north (red in the attached image).
>
>
>
> /Kristian
>
>
>
> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
> *Sendt:* 3. april 2018 22:52
> *Til:* qgis-user@lists.osgeo.org; Kristian Evers 
> *Emne:* Re: [Qgis-user] True North
>
>
>
> OK, that sounds like the solution I'm looking for.
>
> It sounds like the answer is to draw the lines in one projection and then
> transform it to the other, depending upon which orientation is desired for
> those lines.
>
> I hope I have this correct…
>
> Cheers . . . . . Springfield Harrison
>
>
>
> On 03-Apr-2018 02:46, Kristian Evers wrote:
>
> You can use the Mercator projection to digitize true north lines. It is
> conformal and thus preserves angles. The meridian convergence is 0 (that
> is, true north == grid north) all over the map. If you then transform those
> lines to your chosen CRS you should have a set of lines pointing towards
> true north instead of grid north.
>
>
>
> /Kristian
>
>
>
> *Fra:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org
> ] *På vegne af *Alexandre Neto
> *Sendt:* 3. april 2018 11:15
> *Til:* Springfield Harrison  
> *Cc:* qgis-user  
> *Emne:* Re: [Qgis-user] True North
>
>
>
> Maybe something like this :
>
>
>
> https://gis.stackexchange.com/q/115531/6191
>
>
>
> Alexandre
>
> A ter, 3/04/2018, 10:11, Alexandre Neto  escreveu:
>
> Ah sorry,
>
>
>
> I got lost in translation. You are right, I was talking about the magnetic
> north, not the geodetic one.
>
>
>
> Meanwhile,  remembering that all UTM are Transverse Mercator, I don't
> think there's a CRS that will solve you question.
>
>
>
> I think you need to use some formula to convert the grid north measures to
> true north according to the CRS, and the latitude and longitude of the
> place.
>
>
>
> Alexandre
>
>
>
> A ter, 3/04/2018, 09:25, Springfield Harrison 
> escreveu:
>
> Alexandre,
>
> I believe that true north is actually a constant oriented towards the
> North Pole, i e 90 degrees north latitude. Also where all meridians
> converge in the northern hemisphere.
>
> The other North orientations are magnetic north and grid North and these
> do vary as you suggested.
>
> I do need to use a UTM projection but need bearings to be in degrees true
> north.
>
> Thanks Alexandre...
>
> Cheers . . . . .   Spring
>
> Samsung Tab 4
>
> On Apr 2, 2018 4:27 PM, "Alexandre Neto"  wrote:
>
> AFAIK, true bearing differs in time and location because of magnetic
> declination. So I don't think there is a such thing as a CRS with true
> bearings.
>
>
>
> Assuming you are working at regional level, find the magnetic declination
> for that region and remove it from your observations. Then draw the azimuth
> using the chosen CRS. I think 26910 will work just fine.
>
>
>
> If you are at a larger scale, then you may need to use different magnetic
> declination values for each observation.
>
>
>
> This may help:
>
>
>
> https://www.ngdc.noaa.gov/geomag/declination.shtml
>
>
>
> Best Regards,
>
>
>
> Alexandre Neto
>
> A seg, 2/04/2018, 23:54, Springfield Harrison 
> escreveu:
>
> Hello,
>
> I am using CRS 26910, NAD83 / UTM zone 10N, and need to draw lines at
> exact true bearings.  The Advanced Digitizing Tool seems to do this but
> which CRS would I use to ensure that the bearing is True?
>
> Thanks very much . . .
>
>
> Cheers . . . . . Springfield Harrison
>
>
> ___
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>

Re: [Qgis-user] True North

2018-04-04 Thread Andreas Neumann 
Hi Daniel, 

Just do not reply to this e-mail thread, but send a plain new e-mail to
"qgis@u...@lists.osgeo.org" describing your problem with enough detail
that others can follow. 

Note also that this is an english language e-mail list - there may be
some spanish speaking subscribers on the list, but you are more likely
to get replies if you write in english. Or - alternatively - if you want
to write in spanish - you may use a localized e-mail list in a different
language. See https://wiki.osgeo.org/wiki/Local_Chapters or
https://www.qgis.org/en/site/forusers/usergroups.html as a starter. 

Going back to your "Update column" question - please have a look a the
"Field Calculator" - see the corresponding section in the QGIS manual:
https://docs.qgis.org/2.18/en/docs/user_manual/working_with_vector/field_calculator.html
 

Greetings, 

Andreas 

On 2018-04-04 13:45, Daniel Alejandro Montecinos Rubilar wrote:

> Ok, entonces podría indicarme en que correo solucionan ese problema, por 
> favor? Necesito hacer ese cruce con urgencia y no encuentro la solucion. 
> 
> Desde ya muchas gracias 
> 
> DE: Qgis-user  en nombre de Andreas 
> Neumann 
> FECHA: miércoles, 4 de abril de 2018, 08:41
> PARA: 
> ASUNTO: Re: [Qgis-user] True North 
> 
> Dear Daniel, 
> 
> Harrison just meant that is not nice to "hijack" an existing topic thread. If 
> you have a different issue, you should start a new e-mail thread just for 
> that new issue. 
> 
> Andreas 
> 
> On 04.04.2018 13:38, Daniel Alejandro Montecinos Rubilar wrote: 
> 
> Dear, what you refered?  The question is not understood or there is no 
> solution? 
> 
> DE: Springfield Harrison 
> ORGANIZACIÓN: Stellar GPS & Mapping
> FECHA: martes, 3 de abril de 2018, 17:53
> PARA: Daniel Alejandro Montecinos Rubilar 
> CC: 
> ASUNTO: Re: [Qgis-user] True North 
> 
> Hello Daniel,
> 
> You are on quite a different topic here.
> 
> I think you should repost your inquiry using a different subject...
> 
> Cheers . . . . . Springfield Harrison 
> 
> On 03-Apr-2018 06:35, Daniel Alejandro Montecinos Rubilar wrote: 
> 
> GOOD MORNING, 
> 
> I have a query, I have use Mapinfo for several years and I was discover QGIS 
> program and I want change me, but I'am searching one similar function but I 
> dont found. This function, in Mapinfo, his name is "Update Column". Below I 
> leave an image 
> 
> I appreciate your help, it is urgent!!!
> 
> [2] 
> 
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Re: [Qgis-user] True North

2018-04-04 Thread Daniel Alejandro Montecinos Rubilar 
Ok, entonces podría indicarme en que correo solucionan ese problema, por favor? 
Necesito hacer ese cruce con urgencia y no encuentro la solucion.

 

Desde ya muchas gracias

 

De: Qgis-user  en nombre de Andreas Neumann 

Fecha: miércoles, 4 de abril de 2018, 08:41
Para: 
Asunto: Re: [Qgis-user] True North

 

Dear Daniel,

Harrison just meant that is not nice to "hijack" an existing topic thread. If 
you have a different issue, you should start a new e-mail thread just for that 
new issue.

Andreas

 

On 04.04.2018 13:38, Daniel Alejandro Montecinos Rubilar wrote:

Dear, what you refered?  The question is not understood or there is no solution?

 

De: Springfield Harrison 
Organización: Stellar GPS & Mapping
Fecha: martes, 3 de abril de 2018, 17:53
Para: Daniel Alejandro Montecinos Rubilar 
CC: 
Asunto: Re: [Qgis-user] True North

 

Hello Daniel,

You are on quite a different topic here.

I think you should repost your inquiry using a different subject…

Cheers . . . . . Springfield Harrison




On 03-Apr-2018 06:35, Daniel Alejandro Montecinos Rubilar wrote:

Good Morning,

 

I have a query, I have use Mapinfo for several years and I was discover QGIS 
program and I want change me, but I’am searching one similar function but I 
dont found. This function, in Mapinfo, his name is “Update Column”. Below I 
leave an image

 

 

I appreciate your help, it is urgent!!!

 

Virus-free. www.avg.com 




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Re: [Qgis-user] True North

2018-04-04 Thread Andreas Neumann 

Dear Daniel,

Harrison just meant that is not nice to "hijack" an existing topic 
thread. If you have a different issue, you should start a new e-mail 
thread just for that new issue.


Andreas


On 04.04.2018 13:38, Daniel Alejandro Montecinos Rubilar wrote:


Dear, what you refered?  The question is not understood or there is no 
solution?


*De: *Springfield Harrison 
*Organización: *Stellar GPS & Mapping
*Fecha: *martes, 3 de abril de 2018, 17:53
*Para: *Daniel Alejandro Montecinos Rubilar 


*CC: *
*Asunto: *Re: [Qgis-user] True North

Hello Daniel,

You are on quite a different topic here.

I think you should repost your inquiry using a different subject…

Cheers . . . . . Springfield Harrison




On 03-Apr-2018 06:35, Daniel Alejandro Montecinos Rubilar wrote:

*Good Morning,*

**

I have a query, I have use Mapinfo for several years and I was
discover QGIS program and I want change me, but I’am searching one
similar function but I dont found. This function, in Mapinfo, his
name is “Update Column”. Below I leave an image

cid:image001.png@01D3CB37.7072D510

I appreciate your help, it is urgent!!!

Imagen quitada por el remitente.

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Re: [Qgis-user] True North

2018-04-04 Thread Daniel Alejandro Montecinos Rubilar 
Dear, what you refered?  The question is not understood or there is no solution?

 

De: Springfield Harrison 
Organización: Stellar GPS & Mapping
Fecha: martes, 3 de abril de 2018, 17:53
Para: Daniel Alejandro Montecinos Rubilar 
CC: 
Asunto: Re: [Qgis-user] True North

 

Hello Daniel,

You are on quite a different topic here.

I think you should repost your inquiry using a different subject…

Cheers . . . . . Springfield Harrison




On 03-Apr-2018 06:35, Daniel Alejandro Montecinos Rubilar wrote:

Good Morning,

 

I have a query, I have use Mapinfo for several years and I was discover QGIS 
program and I want change me, but I’am searching one similar function but I 
dont found. This function, in Mapinfo, his name is “Update Column”. Below I 
leave an image

 

 

I appreciate your help, it is urgent!!!

 

Virus-free. www.avg.com 



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Re: [Qgis-user] True North

2018-04-03 Thread Springfield Harrison 

Hello Daniel,

You are on quite a different topic here.

I think you should repost your inquiry using a different subject…

Cheers . . . . . Springfield Harrison



On 03-Apr-2018 06:35, Daniel Alejandro Montecinos Rubilar wrote:


*Good Morning,*

**

I have a query, I have use Mapinfo for several years and I was 
discover QGIS program and I want change me, but I’am searching one 
similar function but I dont found. This function, in Mapinfo, his name 
is “Update Column”. Below I leave an image


I appreciate your help, it is urgent!!!


 
	Virus-free. www.avg.com 
 



<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>


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Re: [Qgis-user] True North

2018-04-03 Thread Springfield Harrison 

OK, that sounds like the solution I'm looking for.

It sounds like the answer is to draw the lines in one projection and 
then transform it to the other, depending upon which orientation is 
desired for those lines.


I hope I have this correct…

Cheers . . . . . Springfield Harrison


On 03-Apr-2018 02:46, Kristian Evers wrote:


You can use the Mercator projection to digitize true north lines. It 
is conformal and thus preserves angles. The meridian convergence is 0 
(that is, true north == grid north) all over the map. If you then 
transform those lines to your chosen CRS you should have a set of 
lines pointing towards true north instead of grid north.


/Kristian

*Fra:*Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] *På vegne 
af *Alexandre Neto

*Sendt:* 3. april 2018 11:15
*Til:* Springfield Harrison 
*Cc:* qgis-user 
*Emne:* Re: [Qgis-user] True North

Maybe something like this :

https://gis.stackexchange.com/q/115531/6191

Alexandre

A ter, 3/04/2018, 10:11, Alexandre Neto <mailto:senhor.n...@gmail.com>> escreveu:


Ah sorry,

I got lost in translation. You are right, I was talking about the
magnetic north, not the geodetic one.

Meanwhile,  remembering that all UTM are Transverse Mercator, I
don't think there's a CRS that will solve you question.

I think you need to use some formula to convert the grid north
measures to true north according to the CRS, and the latitude and
longitude of the place.

Alexandre

A ter, 3/04/2018, 09:25, Springfield Harrison
mailto:stellar...@gmail.com>> escreveu:

Alexandre,

I believe that true north is actually a constant oriented
towards the North Pole, i e 90 degrees north latitude. Also
where all meridians converge in the northern hemisphere.

The other North orientations are magnetic north and grid North
and these do vary as you suggested.

I do need to use a UTM projection but need bearings to be in
degrees true north.

Thanks Alexandre...

Cheers . . . . .   Spring

Samsung Tab 4

On Apr 2, 2018 4:27 PM, "Alexandre Neto"
mailto:senhor.n...@gmail.com>> wrote:

AFAIK, true bearing differs in time and location because
of magnetic declination. So I don't think there is a such
thing as a CRS with true bearings.

Assuming you are working at regional level, find the
magnetic declination for that region and remove it from
your observations. Then draw the azimuth using the chosen
CRS. I think 26910 will work just fine.

If you are at a larger scale, then you may need to use
different magnetic declination values for each observation.

This may help:

https://www.ngdc.noaa.gov/geomag/declination.shtml

Best Regards,

Alexandre Neto

A seg, 2/04/2018, 23:54, Springfield Harrison
mailto:stellar...@gmail.com>> escreveu:

Hello,

I am using CRS 26910, NAD83 / UTM zone 10N, and need
to draw lines at
exact true bearings.  The Advanced Digitizing Tool
seems to do this but
which CRS would I use to ensure that the bearing is True?

Thanks very much . . .


Cheers . . . . . Springfield Harrison


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Re: [Qgis-user] True North

2018-04-03 Thread Springfield Harrison 

OK, thank you.  That formula is useful.

I assume that "North" for any projection will be grid North so that a 
line drawn at 0° while using a UTM projection will point to grid North 
if the drawing is re-projected using an un-projected CRS (where 0° is 
true North)?


I wonder if I have that correct?  I will check some of the other 
responses also.


Thanks very much…

Cheers . . . . . Spring Harrison


On 03-Apr-2018 02:15, Alexandre Neto wrote:

Maybe something like this :

https://gis.stackexchange.com/q/115531/6191

Alexandre

A ter, 3/04/2018, 10:11, Alexandre Neto > escreveu:


Ah sorry,

I got lost in translation. You are right, I was talking about the
magnetic north, not the geodetic one.

Meanwhile,  remembering that all UTM are Transverse Mercator, I
don't think there's a CRS that will solve you question.

I think you need to use some formula to convert the grid north
measures to true north according to the CRS, and the latitude and
longitude of the place.

Alexandre


A ter, 3/04/2018, 09:25, Springfield Harrison
mailto:stellar...@gmail.com>> escreveu:

Alexandre,

I believe that true north is actually a constant oriented
towards the North Pole, i e 90 degrees north latitude. Also
where all meridians converge in the northern hemisphere.

The other North orientations are magnetic north and grid North
and these do vary as you suggested.

I do need to use a UTM projection but need bearings to be in
degrees true north.

Thanks Alexandre...

Cheers . . . . .   Spring

Samsung Tab 4

On Apr 2, 2018 4:27 PM, "Alexandre Neto"
mailto:senhor.n...@gmail.com>> wrote:

AFAIK, true bearing differs in time and location because
of magnetic declination. So I don't think there is a such
thing as a CRS with true bearings.

Assuming you are working at regional level, find the
magnetic declination for that region and remove it from
your observations. Then draw the azimuth using the chosen
CRS. I think 26910 will work just fine.

If you are at a larger scale, then you may need to use
different magnetic declination values for each observation.

This may help:

https://www.ngdc.noaa.gov/geomag/declination.shtml

Best Regards,

Alexandre Neto

A seg, 2/04/2018, 23:54, Springfield Harrison
mailto:stellar...@gmail.com>> escreveu:

Hello,

I am using CRS 26910, NAD83 / UTM zone 10N, and need
to draw lines at
exact true bearings.  The Advanced Digitizing Tool
seems to do this but
which CRS would I use to ensure that the bearing is True?

Thanks very much . . .


Cheers . . . . . Springfield Harrison


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Re: [Qgis-user] True North

2018-04-03 Thread Daniel Alejandro Montecinos Rubilar 
Good Morning,

 

I have a query, I have use Mapinfo for several years and I was discover QGIS 
program and I want change me, but I’am searching one similar function but I 
dont found. This function, in Mapinfo, his name is “Update Column”. Below I 
leave an image

 

 

I appreciate your help, it is urgent!!!

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Re: [Qgis-user] True North

2018-04-03 Thread Kirk Schmidt 
The central meridian in each utm zone is oriented directly at true north 
(Easting of 500,000 m).  The difference in angles when you move east of 
west of the meridian is referred to as convergence and the following 
link provides 2 formulas for calculating the convergence angles in utm 
projections.  A quick search on convergence calculators or methods 
should also provide some tools.


https://gis.stackexchange.com/questions/115531/how-to-calculate-grid-convergence-true-north-to-grid-north

Kirk


On 4/3/2018 5:25 AM, Springfield Harrison wrote:


Alexandre,

I believe that true north is actually a constant oriented towards the 
North Pole, i e 90 degrees north latitude. Also where all meridians 
converge in the northern hemisphere.


The other North orientations are magnetic north and grid North and 
these do vary as you suggested.


I do need to use a UTM projection but need bearings to be in degrees 
true north.


Thanks Alexandre...

Cheers . . . . .   Spring
Samsung Tab 4

On Apr 2, 2018 4:27 PM, "Alexandre Neto" > wrote:


AFAIK, true bearing differs in time and location because of
magnetic declination. So I don't think there is a such thing as a
CRS with true bearings.

Assuming you are working at regional level, find the magnetic
declination for that region and remove it from your observations.
Then draw the azimuth using the chosen CRS. I think 26910 will
work just fine.

If you are at a larger scale, then you may need to use different
magnetic declination values for each observation.

This may help:

https://www.ngdc.noaa.gov/geomag/declination.shtml


Best Regards,

Alexandre Neto

A seg, 2/04/2018, 23:54, Springfield Harrison
mailto:stellar...@gmail.com>> escreveu:

Hello,

I am using CRS 26910, NAD83 / UTM zone 10N, and need to draw
lines at
exact true bearings.  The Advanced Digitizing Tool seems to do
this but
which CRS would I use to ensure that the bearing is True?

Thanks very much . . .


Cheers . . . . . Springfield Harrison


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Re: [Qgis-user] True North

2018-04-03 Thread Kristian Evers 
You can use the Mercator projection to digitize true north lines. It is 
conformal and thus preserves angles. The meridian convergence is 0 (that is, 
true north == grid north) all over the map. If you then transform those lines 
to your chosen CRS you should have a set of lines pointing towards true north 
instead of grid north.

/Kristian

Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Alexandre 
Neto
Sendt: 3. april 2018 11:15
Til: Springfield Harrison 
Cc: qgis-user 
Emne: Re: [Qgis-user] True North

Maybe something like this :

https://gis.stackexchange.com/q/115531/6191

Alexandre
A ter, 3/04/2018, 10:11, Alexandre Neto 
mailto:senhor.n...@gmail.com>> escreveu:
Ah sorry,

I got lost in translation. You are right, I was talking about the magnetic 
north, not the geodetic one.

Meanwhile,  remembering that all UTM are Transverse Mercator, I don't think 
there's a CRS that will solve you question.

I think you need to use some formula to convert the grid north measures to true 
north according to the CRS, and the latitude and longitude of the place.

Alexandre

A ter, 3/04/2018, 09:25, Springfield Harrison 
mailto:stellar...@gmail.com>> escreveu:

Alexandre,

I believe that true north is actually a constant oriented towards the North 
Pole, i e 90 degrees north latitude. Also where all meridians converge in the 
northern hemisphere.

The other North orientations are magnetic north and grid North and these do 
vary as you suggested.

I do need to use a UTM projection but need bearings to be in degrees true north.

Thanks Alexandre...

Cheers . . . . .   Spring

Samsung Tab 4
On Apr 2, 2018 4:27 PM, "Alexandre Neto" 
mailto:senhor.n...@gmail.com>> wrote:
AFAIK, true bearing differs in time and location because of magnetic 
declination. So I don't think there is a such thing as a CRS with true bearings.

Assuming you are working at regional level, find the magnetic declination for 
that region and remove it from your observations. Then draw the azimuth using 
the chosen CRS. I think 26910 will work just fine.

If you are at a larger scale, then you may need to use different magnetic 
declination values for each observation.

This may help:

https://www.ngdc.noaa.gov/geomag/declination.shtml

Best Regards,

Alexandre Neto
A seg, 2/04/2018, 23:54, Springfield Harrison 
mailto:stellar...@gmail.com>> escreveu:
Hello,

I am using CRS 26910, NAD83 / UTM zone 10N, and need to draw lines at
exact true bearings.  The Advanced Digitizing Tool seems to do this but
which CRS would I use to ensure that the bearing is True?

Thanks very much . . .


Cheers . . . . . Springfield Harrison


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Re: [Qgis-user] True North

2018-04-03 Thread Alexandre Neto 
Maybe something like this :

https://gis.stackexchange.com/q/115531/6191

Alexandre

A ter, 3/04/2018, 10:11, Alexandre Neto  escreveu:

> Ah sorry,
>
> I got lost in translation. You are right, I was talking about the magnetic
> north, not the geodetic one.
>
> Meanwhile,  remembering that all UTM are Transverse Mercator, I don't
> think there's a CRS that will solve you question.
>
> I think you need to use some formula to convert the grid north measures to
> true north according to the CRS, and the latitude and longitude of the
> place.
>
> Alexandre
>
>
> A ter, 3/04/2018, 09:25, Springfield Harrison 
> escreveu:
>
>> Alexandre,
>>
>> I believe that true north is actually a constant oriented towards the
>> North Pole, i e 90 degrees north latitude. Also where all meridians
>> converge in the northern hemisphere.
>>
>> The other North orientations are magnetic north and grid North and these
>> do vary as you suggested.
>>
>> I do need to use a UTM projection but need bearings to be in degrees true
>> north.
>>
>> Thanks Alexandre...
>>
>> Cheers . . . . .   Spring
>>
>> Samsung Tab 4
>> On Apr 2, 2018 4:27 PM, "Alexandre Neto"  wrote:
>>
>>> AFAIK, true bearing differs in time and location because of magnetic
>>> declination. So I don't think there is a such thing as a CRS with true
>>> bearings.
>>>
>>> Assuming you are working at regional level, find the magnetic
>>> declination for that region and remove it from your observations. Then draw
>>> the azimuth using the chosen CRS. I think 26910 will work just fine.
>>>
>>> If you are at a larger scale, then you may need to use different
>>> magnetic declination values for each observation.
>>>
>>> This may help:
>>>
>>> https://www.ngdc.noaa.gov/geomag/declination.shtml
>>>
>>> Best Regards,
>>>
>>> Alexandre Neto
>>>
>>> A seg, 2/04/2018, 23:54, Springfield Harrison 
>>> escreveu:
>>>
 Hello,

 I am using CRS 26910, NAD83 / UTM zone 10N, and need to draw lines at
 exact true bearings.  The Advanced Digitizing Tool seems to do this but
 which CRS would I use to ensure that the bearing is True?

 Thanks very much . . .


 Cheers . . . . . Springfield Harrison


 ___
 Qgis-user mailing list
 Qgis-user@lists.osgeo.org
 List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
 Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>>
>>> --
>>> Alexandre Neto
>>> -
>>> @AlexNetoGeo
>>> http://sigsemgrilhetas.wordpress.com
>>> http://gisunchained.wordpress.com
>>>
>> --
> Alexandre Neto
> -
> @AlexNetoGeo
> http://sigsemgrilhetas.wordpress.com
> http://gisunchained.wordpress.com
>
-- 
Alexandre Neto
-
@AlexNetoGeo
http://sigsemgrilhetas.wordpress.com
http://gisunchained.wordpress.com
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Re: [Qgis-user] True North

2018-04-03 Thread Alexandre Neto 
Ah sorry,

I got lost in translation. You are right, I was talking about the magnetic
north, not the geodetic one.

Meanwhile,  remembering that all UTM are Transverse Mercator, I don't think
there's a CRS that will solve you question.

I think you need to use some formula to convert the grid north measures to
true north according to the CRS, and the latitude and longitude of the
place.

Alexandre

A ter, 3/04/2018, 09:25, Springfield Harrison 
escreveu:

> Alexandre,
>
> I believe that true north is actually a constant oriented towards the
> North Pole, i e 90 degrees north latitude. Also where all meridians
> converge in the northern hemisphere.
>
> The other North orientations are magnetic north and grid North and these
> do vary as you suggested.
>
> I do need to use a UTM projection but need bearings to be in degrees true
> north.
>
> Thanks Alexandre...
>
> Cheers . . . . .   Spring
>
> Samsung Tab 4
> On Apr 2, 2018 4:27 PM, "Alexandre Neto"  wrote:
>
>> AFAIK, true bearing differs in time and location because of magnetic
>> declination. So I don't think there is a such thing as a CRS with true
>> bearings.
>>
>> Assuming you are working at regional level, find the magnetic declination
>> for that region and remove it from your observations. Then draw the azimuth
>> using the chosen CRS. I think 26910 will work just fine.
>>
>> If you are at a larger scale, then you may need to use different magnetic
>> declination values for each observation.
>>
>> This may help:
>>
>> https://www.ngdc.noaa.gov/geomag/declination.shtml
>>
>> Best Regards,
>>
>> Alexandre Neto
>>
>> A seg, 2/04/2018, 23:54, Springfield Harrison 
>> escreveu:
>>
>>> Hello,
>>>
>>> I am using CRS 26910, NAD83 / UTM zone 10N, and need to draw lines at
>>> exact true bearings.  The Advanced Digitizing Tool seems to do this but
>>> which CRS would I use to ensure that the bearing is True?
>>>
>>> Thanks very much . . .
>>>
>>>
>>> Cheers . . . . . Springfield Harrison
>>>
>>>
>>> ___
>>> Qgis-user mailing list
>>> Qgis-user@lists.osgeo.org
>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>> --
>> Alexandre Neto
>> -
>> @AlexNetoGeo
>> http://sigsemgrilhetas.wordpress.com
>> http://gisunchained.wordpress.com
>>
> --
Alexandre Neto
-
@AlexNetoGeo
http://sigsemgrilhetas.wordpress.com
http://gisunchained.wordpress.com
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Re: [Qgis-user] True North

2018-04-03 Thread Springfield Harrison 
Alexandre,

I believe that true north is actually a constant oriented towards the North
Pole, i e 90 degrees north latitude. Also where all meridians converge in
the northern hemisphere.

The other North orientations are magnetic north and grid North and these do
vary as you suggested.

I do need to use a UTM projection but need bearings to be in degrees true
north.

Thanks Alexandre...

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 2, 2018 4:27 PM, "Alexandre Neto"  wrote:

> AFAIK, true bearing differs in time and location because of magnetic
> declination. So I don't think there is a such thing as a CRS with true
> bearings.
>
> Assuming you are working at regional level, find the magnetic declination
> for that region and remove it from your observations. Then draw the azimuth
> using the chosen CRS. I think 26910 will work just fine.
>
> If you are at a larger scale, then you may need to use different magnetic
> declination values for each observation.
>
> This may help:
>
> https://www.ngdc.noaa.gov/geomag/declination.shtml
>
> Best Regards,
>
> Alexandre Neto
>
> A seg, 2/04/2018, 23:54, Springfield Harrison 
> escreveu:
>
>> Hello,
>>
>> I am using CRS 26910, NAD83 / UTM zone 10N, and need to draw lines at
>> exact true bearings.  The Advanced Digitizing Tool seems to do this but
>> which CRS would I use to ensure that the bearing is True?
>>
>> Thanks very much . . .
>>
>>
>> Cheers . . . . . Springfield Harrison
>>
>>
>> ___
>> Qgis-user mailing list
>> Qgis-user@lists.osgeo.org
>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
> --
> Alexandre Neto
> -
> @AlexNetoGeo
> http://sigsemgrilhetas.wordpress.com
> http://gisunchained.wordpress.com
>
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Re: [Qgis-user] True North

2018-04-02 Thread Alexandre Neto 
AFAIK, true bearing differs in time and location because of magnetic
declination. So I don't think there is a such thing as a CRS with true
bearings.

Assuming you are working at regional level, find the magnetic declination
for that region and remove it from your observations. Then draw the azimuth
using the chosen CRS. I think 26910 will work just fine.

If you are at a larger scale, then you may need to use different magnetic
declination values for each observation.

This may help:

https://www.ngdc.noaa.gov/geomag/declination.shtml

Best Regards,

Alexandre Neto

A seg, 2/04/2018, 23:54, Springfield Harrison 
escreveu:

> Hello,
>
> I am using CRS 26910, NAD83 / UTM zone 10N, and need to draw lines at
> exact true bearings.  The Advanced Digitizing Tool seems to do this but
> which CRS would I use to ensure that the bearing is True?
>
> Thanks very much . . .
>
>
> Cheers . . . . . Springfield Harrison
>
>
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-- 
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-
@AlexNetoGeo
http://sigsemgrilhetas.wordpress.com
http://gisunchained.wordpress.com
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