[geos-devel] GEOSPolygonize() ERROR: Shell is not a LinearRing
woodbri at swoodbridge.com
Wed Dec 28 19:39:43 EST 2005
I am trying to write a simple utility that will read a shapefile of
polygons, decompose them into simple linestrings and feed them to
GEOSPolygonize() so I can take the results and write a new shapefile
with good polygons.
So, I have this coded using geos_c.h. I used postgis buildarea() as an
example of how to process the output of GEOSPolygonize(), but get the
following ERROR thrown by GEOS from this statement:
g = GEOSPolygonize(geoms, nedge);
if (! g || GEOSGeomTypeId(g) != GEOS_GEOMETRYCOLLECTION)
ngeoms = GEOSGetNumGeometries(g);
printf("GEOSPolygonize returned %d geoms\n", ngeoms);
extring = GEOSGeom_createPolygon(
GEOSPolygonize returned 6 geoms
Processing Geom 0
ERROR: Shell is not a LinearRing
I guess, my question is what does this error mean? And why would
GEOSPolygonize return something that is not a polygon or LinearRing?
If it would by helpful, I can post fixpoly.c and the shapefile.
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