On 5/23/20 11:21 AM, Jorge Gustavo Rocha wrote:
> Hi Seggie,
>
> Just one line of code to add a folder to browser panel:
>
> iface.browserModel().addFavoriteDirectory('/home/jgr/tmp')
And to add some more context: QGIS is build using Qt widgets, which has
a model/view programming paradigm:
Hi,
Please could someone remind me how to get round this problem. Having
upgraded to the latest version I get this message on trying to open:
*“QGIS3.12.app” can’t be opened because Apple cannot check it for malicious
software.*
THanks
Hamish
___
Hi Seggie,
Just one line of code to add a folder to browser panel:
iface.browserModel().addFavoriteDirectory('/home/jgr/tmp')
Regards,
Jorge
On 22/05/20 14:37, Seggie, Graeme wrote:
>
> Hello,
>
>
>
> I am struggling to get something to work, which would seem to be an
> easy thing to do,
One other thing that may or may not be of use but the USDA Forest
Service Publishes a GPS Receiver Report that covers phones - and that's
helped if I've had a client go "Well I have a Apple or a
Android ". At least I feel slightly better going "good enough" or
"no not good enough".
It
Hi,
This is a very interesting list. It basically confirms what I thought. Consumer
Point and shoot deceives are all around 2-6m with no canopy. The average
multiple positions basically give you a better idea as a gps may get lucky. It
would be nice to have the full methodology for this and
Ciao,è possibile farlo con il calcolatore campi. Si scrive una funzione che
assegna un categoria ad ogni elemento utilizzando un algoritmo come ad
esempio i quantili.Questo è un esempio che funziona con i quartili (4
categorie), da testare con gli altri quantili.CASEWHEN"POP_TOT" <
I actually got a response on Stack Exchange regarding this query, so in the
interests of sharing the response...
Code to run in QGIS Python console is:
browserModel = iface.browserModel()
dirs = ['U:\dir1', 'U:\dir2', 'U:\dir3', 'U:\dir4']
for dir in dirs:
If you don't want to attempt to engineer your own GNSS hardware + software,
you may want to check out the Bad Elf GNSS Surveyor. Yes, it's in the
neighborhood of $500 US, but gives relatively consistent positions within
about 1 meter with averaging, its data can be differentially
corrected using
abble.com/QGIS-Italian-User-f5250612.html
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I got involved in a project to locate the actual boundary monuments
which delimit our town. The USGS 7.5' topographic maps appeared to be
in error at some locations by several hundred feet. About 30 monument
locations were involved.
We are in rural NH which is mostly wooded, which results
Hi,
if the data is likely to change frequently, you might want to add a
virtual field. Thus, the MAX_AREA would always be up to date.
https://docs.qgis.org/3.10/en/docs/user_manual/working_with_vector/attribute_table.html?#creating-a-virtual-field
Regards
Jochen
Am 20.05.20 um 00:09 schrieb
Buon pomeriggio a tutti,
avrei per favore una richiesta: sto sviluppando un sistema di
visualizzazione web di progetti geografici che utilizza Django,
leaflet y Mapnick. Avete per caso idee di come sviluppare una
funzionalità, come in QGIS, che riesca a mostrare i vari tipi di
On 23.05.20 20:33, Pepijn Koops wrote:
Hi, can anyone explain how I can have QGIS transform a map consisting
of intersectioning lines into a map consisting of neighbouring polygons?
Many thanks in advance!
Pepijn Koops
errp ... please try to rephrase your question or give more info.
Hello all. Regarding GNSS precision, I also find useful the Trimble online GNSS
planning website:
https://www.gnssplanning.com/#/settings
Which lets you pick a location and timeframe, and it will show you the real
time status of each GNSS constellation, and lets you pick some or all. It will
Hi,
I looked at the page.It looks like a neat project! Buy time you buy a case,
antenna... (I don’t think they come with on), your back into the price range of
a forestry grade survey GPS unit. I think the Emild single band gps
(https://emlid.com/reachrs/ ) is probably a better choice unless
On 5/23/2020 11:51 AM, Bernd Vogelgesang wrote:
Unfortunately, the Forest Service Website went offline (maybe
this thread caused so much traffic that it broke down? ;) )
I've attached the spreadsheet from the link.
Hi Nicolas,
there are several potentially accurate GNSS modules available, even
sensitive choke ring antennas aren't that expensive. What's time
consuming and difficult is building a whole functioning system
(integration and software).
This would be a great university project - develop an open
Just one issue I did not see addressed so far.
The type of antenna a GPS uses makes a big difference. In forested landscapes,
the eTrex, for example, with its flat antenna (like a single penny) is
noticeable worse for receiving satellite data than a Garmin 60 series with an
antenna formed like
Unfortunately, the Forest Service Website went offline (maybe this
thread caused so much traffic that it broke down? ;) )
I'm also desperately searching for an affordable way to have at least
some decent accuracy. I do not need submeter, but it would be fantastic
if it was possible to achieve
Hi, can anyone explain how I can have QGIS transform a map consisting of
intersectioning lines into a map consisting of neighbouring polygons?
Many thanks in advance!
Pepijn Koops
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Hi Steve,
I think there are two different aspects to your question:
1) Accuracy of GPS Devices
I agree with others that you can't expect a better accuracy than the 10
to 30 feet you observed with a smartphone or a simple handheld GPS. This
might improve by averaging, but this takes time. Survey
Hi,
Some discussion here.
https://gis.stackexchange.com/questions/207463/convert-a-line-to-polygon
You will probably have to split the line where they intersect...
Nicolas Cadieux
Ça va bien aller!
> Le 23 mai 2020 à 14:33, Pepijn Koops a écrit :
>
>
> Hi, can anyone explain how I can
https://besjournals.onlinelibrary.wiley.com/doi/full/10./j.2041-210X.2011.00118.x
I did this quite a few years ago but in the graph in supplimentary material it
shows how the accuracy of one consumer grade gps varies over time (at a fixed
point). At the time I also did a lot more
Hi,
I see lot's of people are interested in this topic. I recommend reading
this basic Guide on GPS Positioning.
https://www.rncan.gc.ca/sites/www.nrcan.gc.ca/files/earthsciences/pdf/GPS_Guide_e/GPS_Guide_e.pdf
It's an older guide, (before waas, glonas, and even before GPS clock
signal was
I hate to plug my own… but my book on GNSS may also be of interest, not too
much either!
https://www.springer.com/gp/book/9781493926077
Scott
On May 23, 2020, at 8:27 PM, Nicolas Cadieux
wrote:
Hi,
I see lot's of people are interested in this topic. I recommend reading this
basic
Hi,
Well I don’t have much experience with the Emlid, but if you are interested, I
can place you in contact with someone who does. Write to me in private. The
important thing is to keep both units in proximity so that they both have the
same atmospheric errors. The advantage of the Emlid is
I have a raster image I would like to assign a value to the 3 RGB bands
that are equal to 255. I have several hundred raster images where the
image is overexposed (white) and band1=255, band2=255 and band3=255.
Is there a way to run a script that would assign a new value to each of the
three
One app that claims to do a lot of what high precions gps does is
https://play.google.com/store/apps/details?id=gr.stasta.mobiletopographer=en_GB
It does allow averaging and shows quite a lot of what is going on, but still
limited by the phone's antenna. May have to take some of the accuracy
This discussion is interesting and very helpful.
Some remarks from our experiences in a densely forested region with narrow
valleys and steep slopes, lots of water floating in creeks and abandoned rice
paddies -- water all around.
ANTENNA:
The antenna of Garmin 64 is a lot quicker in
Testing it in QGIS 3.4.
Processing (Toolbox) -> Vector geometry -> Polygonize
You give it the linestring layer and it will create polygons wherever there
is an enclosed area. The lines do not require common vertices at the
intersections.
It does allow the ability to create the same
Hi Scott, Nicolas,
that was helpful, as well as Nicolas' advice. Thanks to you both!
Maria
> Am 24.05.2020 um 10:09 schrieb Madry, Scott :
>
> I hate to plug my own… but my book on GNSS may also be of interest, not too
> much either!
>
> https://www.springer.com/gp/book/9781493926077
>
>
I think this is a great discussion. I have been working with GPS's for well
over 10 years and I have a modest paper with an image showing GPS tracks
from my phone (Galaxy Note), a Garmin Montana and my Trimble Geo7X that
shows these issues with accuracy. I happy to share if someone can explain
how
ANTENNA:
The antenna of Garmin 64 is a lot quicker in receiving signals than
that of the <100$ Garmin etrex10, but it was not more precise, just a lot
quicker,
The Garmin 64 is not more precise in environments where it gets the same
satellites as the etrex
In densely
The situation I was working with involved 30 points, some involving long
hikes through the woods, spread around the periphery of a 36 square mile
area with heavy foliage and poor or non-existent cell phone coverage.
This precluded the use of any real-time reference base signals.
My solution
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