Paul, > But at the red asterix, I have an invalid shape. The reason is according to > GEOS: > Polygon must be clockwise
I can't see such error emitted by GEOS source code. even@even-i700:~$ grep -r "must be clockwise" geos/ even@even-i700:~$ Are you sure this comes from it ? As far as I know, GDAL and GEOS are pretty much indifferent regarding the winding order of polygons. Other tools might be more sensitive. You could possibly use the ST_ForceLHR() function of spatialite (through the SQL SQLite dialect) to post process your result: http://www.gaia-gis.it/gaia-sins/spatialite-sql-4.2.0.html Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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