Thanks Even and Jukka for the clarification.
Due to historical reasons, MapWinGIS is not using GDAL/OGR to read/write
shapefiles. It is using its own implementation.
For now, I will clip with OGR first and then fix with MapWinGIS, this will
produce valid shapes.
It does take a bit longer.
Should
On vendredi 13 octobre 2017 09:06:46 CEST Paul Meems wrote:
> Thanks Even for your quick reply.
>
> I was using MapWinGIS to perform the validation and I assumed it was just
> using GEOS.
> I did a closer look at the code and it is first doing some internal checks
> like the minimum number of poin
Even Rouault-2 wrote
> 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
Interesting, that ST_ForceLHR in Spatialite gives the same result than
ST_ForceRHR
Thanks Even for your quick reply.
I was using MapWinGIS to perform the validation and I assumed it was just
using GEOS.
I did a closer look at the code and it is first doing some internal checks
like the minimum number of points and the order of the points.
The code is checking if the polygon shap
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,
Hi list,
I have a very large shapefile, with almost 700k shapes which I want to clip
with a border shapefile (in red):
https://ibb.co/gKth1G
I'm using this command:
ogr2ogr -clipsrc "border.shp" -overwrite -explodecollections -f "ESRI
Shapefile" ogr_clipped.shp Fishnet.shp
with GDAL 2.1.3, relea
