#168 Intersecting line and polygon produces errors

[Johan Van de Wauw]

I bumped on this blogpost:

SAGA GIS Intersect Line-Polygon
~15min — acceptable but still 7x slower than ArcGIS and produces wrong results? The images below show SAGA GIS Intersect(with dangles removed) and same area with ArcGIS Intersect – Clearly SAGA did not intersect the line and polygon correctly as there should be no connection of the lines. These errors are scattered throughout the new output!!! In addition Line-Polygon does not retain the polygon intersect attributes to the line unlike the other methods mentioned above…

Full data to test is available.

http://qandasys.info/grass-v-overlayqgis-intersect-speed-intersecting-line-and-polygon/

[Volker Wichmann]

I'm closing this as the link to the data is broken. In the meantime the clipper library has been updated several times, hopefully performing better. Please reopen if this problem still persists.