[gdal-dev] curved polygon -> polygon

[Martin Landa]

Hi,

I wonder why curved polygons are not approximated to polygons somehow
automatically. Eg. conversion such data fails

$ ogr2ogr -f PostgreSQL PG:dbname=ruian_test
/vsicurl/http://vdp.cuzk.cz/vymenny_format/soucasna/20141031_OB_564567_UKSH.xml.gz
Parcely -overwrite
Warning 1: Geometry to be inserted is of type Curve Polygon, whereas
the layer geometry type is Polygon.
Insertion is likely to fail
ERROR 1: COPY statement failed.
ERROR:  Geometry type (CurvePolygon) does not match column type (Polygon)
CONTEXT:  COPY parcely, line 18, column originalnihranice:
"010A00002032BF0D000100000001090000000300000001020000000B0000008FC2F528750A27C11F85EB51933C2EC114AE47..."

because some features are curved polygons even geometry column is `polygon`:

$ ogrinfo /vsicurl/http://vdp.cuzk.cz/vymenny_format/soucasna/20141031_OB_564567_UKSH.xml.gz
Parcely -fid 2815 | grep OriginalniHranice
Geometry (OriginalniHranice): Polygon
  OriginalniHranice = CURVEPOLYGON (CIRCULARSTRING (-755129.01
-990678.86,-755126.27 -990676.99,-755123.39 -990678.25,-755123.18
-990678.53,-755123.14 -990682.18,-755125.92 -990683.76,-755128.53
-990682.62,-755129.22 -990679.38,-755129.01 -990678.86))

Thanks for clarification in advance, Martin

-- 
Martin Landa
http://geo.fsv.cvut.cz/gwiki/Landa
http://gismentors.eu/mentors/landa