>I' m looking for stuff and advice about GIS (Geographic Information System).
>Google can give me stuff, so I' m asking for advice (but stuff too) about integrating GIS with VFP.
>Mainly, I' ve the need of extracting information from Esri-shapefiles from two different files and be able to determine the common area (if exists) between the two polygons: one belonging to the first shapefile and one (polygon) to the second, which may or not (or partially) cover the first one.
>TIA
>
>Bruno Maddalozzo

Bruno,
Then checkout ESRI Mapobjects activex control.
PS: If you can't afford it there are others that can read/write (check blue marble, mapinfo etc - I don't know which ones support shp files.)

Another hard solution is to decode polygons from shp files. ESRI whitepaper gives the details of how they're stored in shp files.
Cetin