I created this issue https://issues.qgis.org/issues/20489
Le mer. 14 nov. 2018 à 11:56, kimaidou <kimai...@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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