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

kimaidou kimaidou at gmail.com
Wed Nov 14 03:03:03 PST 2018


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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