[Qgis-user] Qgis Map composer scale distorted in hard copy (printout)

[Sashikumar N]

Dear All,
This is my first post to the forum as a new member. I seemed to be jinxed
by a scale distortion problem. I am using windows 8.1 version, Qgis 2.8.1,
installed as standalone version.

Here is my problem, I am setting the scale in the Map composer as 1:250,000
for a test print of A4 size sheet. i know the  straight line distance of
two points in the vector layers of map view. The distance is 52.5 km
approximately. For the above scale it means 1cm = 2500 m (2.5 km). For the
distance between the known points it should measure as 21 cm in a printout.
I exported the map composer sheet to pdf file and then printed it. Now when
i measure the distance between the known points, it measures only 17.8 cm
instead of 21 cm or the distance on ground is calculated as only
44.5 km. So for the printed map, the scale is not 1:250,000 as fixed in the
map composer, but 1:295000

While printing i have taken care that, auto scaling / fit to page etc from
printer setting is disabled. So i guess i print as it came out of the map
composer.

My question in simple terms: does the map composer scale and printed map
scale match in a normal course? What is the mistake i am doing. Am i
ignoring the projection effects or any other basic criteria in creating the
map composition? How do i make sure that the scale in the printout is same
as the map composer scale?


Thanks for your help

ps: All my layers CRS is EPSG 24343 (Kalainpur 1975 / UTM zone 43 N), I am
using EPSG 4326 OTF to get lat long to be printed on the map. The distance
between points is measured horizontally across the map.

-- 
Thankyou
regards
sashi
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Re: [Qgis-user] Qgis Map composer scale distorted in hard copy (printout)

[Sashikumar N]

Hi Andreas,
Thankyou for the reply, I had similar thoughts on the projection, your mail
made me to go for it. I removed the 4326 OTF projection in the layers and
applied it only for the grid.  Tested it for a A4 sheet for the scale and
went for an A0 full color sheet.  I verified the measurements on the sheet,
its very close to the real distance. Thankyou very much for sharing your
thoughts on the problem.

Regards
Sashi

On Tue, 2 Jun 2015 09:31 Andreas Neumann a.neum...@carto.net wrote:

  Hi Sashi,

 First when I read your mail I thought - ok, this guy did not print out the
 PDF on  a 100% scale. Forgive me, but I lot of people ignore this option
 and then complain.

 But your case seems to be a bit more complex.

 What I propose is that you do not use EPSG 4326. Keep using your meter
 based projection and use a different CRS (e.g. EPSG 4326) just for your map
 grid. Since 2.6 (I believe), it is possible to define the CRS for the map
 grid separately and even have multiple grids on the same map. Please use
 this approach and see if it works better.

 Getting a correct map scale for CRS 4326 (Plate Caree projection) is hard
 - since at every latitude the scale is different.

 Hope this helps,
 Andreas


 On 01.06.2015 22:49, Sashikumar N wrote:

 Dear All,
 This is my first post to the forum as a new member. I seemed to be jinxed
 by a scale distortion problem. I am using windows 8.1 version, Qgis 2.8.1,
 installed as standalone version.

  Here is my problem, I am setting the scale in the Map composer as
 1:250,000 for a test print of A4 size sheet. i know the  straight line
 distance of two points in the vector layers of map view. The distance is
 52.5 km approximately. For the above scale it means 1cm = 2500 m (2.5 km).
 For the distance between the known points it should measure as 21 cm in a
 printout. I exported the map composer sheet to pdf file and then printed
 it. Now when i measure the distance between the known points, it measures
 only 17.8 cm instead of 21 cm or the distance on ground is calculated as
 only
 44.5 km. So for the printed map, the scale is not 1:250,000 as fixed in
 the map composer, but 1:295000

  While printing i have taken care that, auto scaling / fit to page etc
 from printer setting is disabled. So i guess i print as it came out of the
 map composer.

  My question in simple terms: does the map composer scale and printed map
 scale match in a normal course? What is the mistake i am doing. Am i
 ignoring the projection effects or any other basic criteria in creating the
 map composition? How do i make sure that the scale in the printout is same
 as the map composer scale?


  Thanks for your help

  ps: All my layers CRS is EPSG 24343 (Kalainpur 1975 / UTM zone 43 N), I
 am using EPSG 4326 OTF to get lat long to be printed on the map. The
 distance between points is measured horizontally across the map.

  --
 Thankyou
 regards
 sashi


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Re: [Qgis-user] image export ?

[Sashikumar N]

Hi,
You should try "Print Composer" to export all layers as an image, it has
option for setting resolution. Have to check if it has options for
compression.

regards
sashi

On Fri, Sep 11, 2015 at 4:50 PM, image93  wrote:

> Good afternoon,
>
> In input, i have a raster *tif file (resolution : 50 cms / compress mode
> JPEG with compress quality 75/100).
>
> I would like to do an georeferenced export representing the raster file and
> several vector files that i added the in map canvas
>
> Idealy,in output, i would like create a file with the same input parameters
> (tif format, 50 cms resolution, compress mode jpef 75/100) .
>
> Is it possible to do that with qgis?
>
> Thanks.
>
>
>
> --
> View this message in context:
> http://osgeo-org.1560.x6.nabble.com/image-export-tp5223779.html
> Sent from the Quantum GIS - User mailing list archive at Nabble.com.
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sashi
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[Qgis-user] Query on Expressions

[Sashikumar N]

Dear All,
I am using QGIS Map composition and for an Attribute feature filtering, i
am  trying to use two functions at the same time in the filter expressions,
i dont know how to combine them.
One function is for filtering records with field id > 29 and other function
is to wrap text of the field Village with more than 25 characters

I am familiar with a expression like :

upper(title('Town'))

How do i combine two functions like this (from Records and Strings) in an
expression ?

$id > 29 and wordwrap( "Village",25)


thankyou

regards
sashi
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regards
sashi
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Re: [Qgis-user] QGIS Plugin Repositories not available?

[Sashikumar N]

Hi Heather,
I just found out today that the repositories are not loading for me, i
thought its something to do with my qgis installation. The url
plugins.qgis.org/ shows 502 bad gateway error. After a bit of search i
found that server might be down, the site http://isup.me/ checks that out.

regards
sashi



On Fri, Sep 2, 2016 at 3:41 PM, Hillers Heather <
heather.hill...@erftverband.de> wrote:

>
> The last few days we have lost the ability to load the QGIS Plugin
> Repositories at
> https://plugins.qgis.org/plugins/plugins.xml?qgis=2.14
>
> The same is happening for versions 2.8 and 2.16.  Their Status is
> unavailable.  We haven't changed our system (that I am aware of) and we can
> load WMS Services fine.  The problem comes with both Default Proxy and Http
> Proxy.  Is there something going on with the system or the paths or is it
> just us?
>
> Thanks,
>
> Heather
>
> Heather Hillers
> Abteilung: Informationstechnologie
> Erftverband, Am Erftverband 6 , D 50126 Bergheim
>
>
> Für die Programmierung von Navigationsgeräten empfehlen wir noch für
> einige Zeit die Eingabe Paffendorfer Weg 42 zu verwenden.
>
> Erftverband: Wasserwirtschaft für unsere Region - mit zertifiziertem
> Qualitäts-, Umwelt- und technischem Sicherheitsmanagement.
>
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regards
sashi
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