[Qgis-developer] Open source API to convert raster to polygons?
Ricardo Scachetti Pereira
ricardo at tdwg.org
Wed Jan 9 10:15:04 EST 2008
Does anyone know of any open source geoprocessing APIs that I can
use to convert raster maps into polygons (as a shapefile or SQL for
PostGIS)? Does QGIS do that?
I know that GDAL (via gdal_contour utility) can turn a raster into
lines, but that's not good enough for me. I need closed polygons that I
later intend to import into PostGIS. Gdal_contour would give usable
intermediate results (i.e, it produces lines that I think can be turned
into closed polygons), if it wasn't for the open polygons that are
created where the grid values touch NODATA values.
I have considered using GRASS (r.poly) but I need to embed the
geoprocessing library on an research application that I will deploy to
Windows desktop computers. To be completely honest, I can't even
install GRASS on my Windows workstation, so I have no hopes of
deploying it via a neat installer :(( . That's probably due to the lack
of intelligence and patience, and is another story.
Any help with this would be greatly appreciated.
Software Engineer and GIS Application Developer
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