Bug report #11452
OSM Vector tool export different number of features compared to loading the same osm data with ogr
|Affected QGIS version:
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|Crashes QGIS or corrupts data:
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refer attached osm file that was downloaded with the Vector OSM tool, then imported into spatialite with the same tool.
Open the file directly with the normal vector layer tool and compare the lines, points and multipolygons layers with the Points, Polylines and Polygons layers generated by the "export topology to spatialite" tool.
In this case the OSM tool created subsets of lines and polygons and additional points.
I would imagine these two methods should produce the same, correct output. If one is correct, which one is it? Or am I missing something....
#2 Updated by Jukka Rahkonen over 9 years ago
GDAL OSM driver and the native QGIS OSM tools are different implementations. A well educated user might get the same result with both those tools at least with points but perhaps still not with polylines and polygons. That's because implementations probably use different logic when they interpret if a closed ring should go to lines or polygons.
I would say that this issue won't fix so that those two tools would ever yield similar results. The fix would rather be to document how the tools behave and what are the differences between them. A quick start would be to point users to read carefully http://www.gdal.org/drv_osm.html and understand at least the importance of the osmconf.ini file.