Winkel Tripel projection - high geometry simplification at low scale #36898
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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
Vectors
Related to general vector layer handling (not specific data formats)
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domlysz
added
the
Bug
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layer properties > rendering > simplify geometry (to disable) |
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that's it ! sorry to annoy the team with an invalid bug report. Have a nice day |
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I don't know that this is not a bug here. Disabling the simplification is merely a workaround to not suffer from what appears to be a bug here. @nyalldawson , thoughts? |
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I think it's a bug -- we should automatically disable the simplification when this situation occurs |
gioman
added
Projections/Transformations
nyalldawson
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to nyalldawson/QGIS
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this issue
Jun 11, 2020
More numerically stable in the case of massive rectangles. This is the ultimate cause behind qgis#36898 -- during rendering of the worldwide layer in Winkel Tripel the inverse transform fails, so the renderer sets a "maximal" filter extent for the layer (+/- double max). The previous method for calculating the rectangles center would fail, because it would overflow. The new method handles this case and correctly returns 0,0. Fixes bounding boxes show incorrectly when simplication is enabled for a layer in certain projections. Fixes qgis#36898 Refs qgis#30686 (partial fix -- this report includes two different bugs)
nyalldawson
added a commit
that referenced
this issue
Jun 11, 2020
More numerically stable in the case of massive rectangles. This is the ultimate cause behind #36898 -- during rendering of the worldwide layer in Winkel Tripel the inverse transform fails, so the renderer sets a "maximal" filter extent for the layer (+/- double max). The previous method for calculating the rectangles center would fail, because it would overflow. The new method handles this case and correctly returns 0,0. Fixes bounding boxes show incorrectly when simplication is enabled for a layer in certain projections. Fixes #36898 Refs #30686 (partial fix -- this report includes two different bugs)
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Describe the bug
When using the Winkel Tripel projection at low scale, feature are displayed as simplified tetragone instead of full geometry. Screenshoots bellow :
How to Reproduce
QGIS and OS versions
QGIS 3.13, GDAL 3.2, PROJ 7.1, bug appears both on Windows and Linux
Additional context
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