[gdal-dev] GDAL and monster multipolygons

[Even Rouault]

On vendredi 25 octobre 2019 20:52:06 CET Rahkonen Jukka (MML) wrote:
> Hi,
> 
> This shapefile from the Inspire dataportal
> https://geospatial.jrc.ec.europa.eu/geoserver/wad/ows?service=WFS&version=1
> .0.0&request=GetFeature&typeName=wad%3Alpd_int2&outputFormat=SHAPE-ZIP
> 
> contains 226 (multi)polygons, one of them with 516716 ring. It seems that
> ogr2ogr can't explode the geometries in a reasonable time. Spatialite-gui
> did the job in 2 min 30 sec with
> 
> select elementarygeometries('lpd_int2','GEOMETRY','exploded','id_1','id_2');
> 
> Perhaps GDAL could be improved as well.

Indeed. I've just committed an improvement. 

ogr2ogr -explodecollections out.sqlite /vsizip/lpd_int2.zip

runs now in 6 min 50s with a debug build. The resulting file contains
3 185 596 features and weighs 778 MB. 

Even

-- 
Spatialys - Geospatial professional services
http://www.spatialys.com