[gdal-dev] raster to polygon

[Xiaodong Zhang]

Hi,

Currently, I'm using gdal and ogr to convert a map after classification 
into a point shape file. Since the classification map typically consists 
of zones, a polygon shape file would make more sense. I'm wondering if 
anyone would know or share the idea of how to convert a map into a 
polygon shape file directly.

Thanks
Xiaodong