I have a map of drainage basins and another of the project property boundary. Of the 4200+ basins in the map, the property is in only a dozen or so. I'm trying to overlay these maps to produce a union that has only those basins that drain the property. v.overlay with operator=or yields a combined map of _all_ basins and the property[1] so either I'm not correctly applying the module, or the resulting map needs more processing with a different module. Please point me in the right direction to get the results I want.
After I have a map containing only those basins overlaid by the property boundary I want to use v.overlay to clip the stream networks in these same basins. I assume that v.overlay with op=and will do this nicely. My question is then what process will allow me to extract each drainage basin with its stream network and portion of the property for terrain and hydrological analyses and modeling. I have another issue with the DEM, but that will be on a separate thread. Rich [1] Using the wxPython GUI with v.overlay I did not see a data entry widget to select the operator. It apparently defaults to 'or' but if there's a radiobox to select 'or,' 'and,' 'not,' or 'xor' I did not see it. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
