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

[Harish]

I also faced the similar problem and the approach suggested is a good
solution.
Regards
Harish​

On Tue, Jun 2, 2015 at 8:04 PM, Sashikumar N <sashikumar.n at gmail.com> wrote:

> 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.neumann at 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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