[QGIS-Developer] QGIS composer export - issue with projection, scale & scalebar ?

[kimaidou]

Hi all,

Sorry for my previous message, which (I just realize) can appear rude if
you have not received the first one. In fact I sent a "normal" first
message with my Gmail account, and attached some files. Wich obviously was
not allowed by the mailing list. So I decided to create a issue in the QGIS
hub instead. I should have done that first.
Let continue the talk in the hub.

Sorry for this.
Michaël

Le mer. 14 nov. 2018 à 12:03, kimaidou <kimaidou at gmail.com> a écrit :

> I created this issue
> https://issues.qgis.org/issues/20489
>
> Le mer. 14 nov. 2018 à 11:56, kimaidou <kimaidou at gmail.com> a écrit :
>
>> Hi !
>>
>> I am facing what seems to be an issue, or probably something well known
>> by anyone but me...
>>
>> I have created 2 very simple QGIS projects (attached with data)
>>
>> * 1 vector polygon grid 1km X 1km (GeoJSON), created with the Vector
>> processing tool.
>> * 1 OpenStreetMap TMS background layer (EPSG:3857)
>> * 1 A4 composer with a map taking full size, and a scale bar
>> * 1 project in EPSG:3857 & its brother in EPSG:2154 (French proj)
>>
>> Issues noted:
>>
>> * In the composer, the scale bar does not fit with the 1km grid, in both
>> projects.
>> * After defining the same scale (1:10 000) in the composers, the view are
>> really different in the 2 projects (see attached PDF)
>>
>> I know projections are biased representations of the reality, but as a
>> user perspective, this 2 behaviours really seem like issues. Every time a
>> user prints a map and take the A4 paper, he is condident he will be able to
>> use his ruler to measure things and convert to real distances according to
>> the scale. Or report N times the scale bar segments to get distances.
>>
>> I am like someone who just discovers the Earth is not flat...
>>
>> NB: I have tested this behaviour only in 2.18.
>>
>
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