Wrong measurements when background is from a tiled service #20337
Labels
Bug
Either a bug report, or a bug fix. Let's hope for the latter!
Projections/Transformations
Related to coordinate reference systems or coordinate transformation
Author Name: Paolo Cavallini (@pcav)
Original Redmine Issue: 12143
Affected QGIS version: 2.6.0
Redmine category:projection_support
The scale gets wrong if one adds a tiled baselayer (e.g. Google or OSM via OpenLayers plugin, or via GDAL XML). E.g. at 1:2257 scale, on the video a 100 m line is 4.8 cm; adding a baselayer it becomes 6.9 cm, without changing the scale.
If I load a EPSG:3003 layer, add an OpenLayers plugin layer, the scale gets wrong and the project projection is set at 3857. Changing the projection back to 3003 makes things right again.
Apparently GDAL does not choose the correct zoom level to display the tiles. It does not seem related to the OL plugin, as it behaves the same on the server (seen through LizMap, with the same baselayer).
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