I have been using the GDAL utilities. But ran into a snag. We create KML overlay files, basically KML file that geolocates a PNG on google maps. This PNG is a vector image as well as can have 1 or two colors other than the transparent background. We used gdal to convert this to a GEOTIFF using the gdal_contour and this work quite well, its ignores the colors for the most part, as all we want is a poly of the colored areas, don't care about what color. gedal_polygonize, sees all colors and seams much more rough.
in both cases, we generate a KML shapefile, but it appears they create line entries vs polygons. We also use ogr2ogr to simplify the KML as well. Can anyone give me some better method to get a pologyon for only the colored areas , ignoring changes in color.? Dennis Burgess,
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