Is there an efficient way to calculate areas of polygons in one vector layer (shapefile) that intersect polygons in another vector layer?
For example, overlaying a nature preserve shapefile onto a land ownership shapefile, I want to know the summed areas (e.g., ha) of each preserve in each ownership. For example, Preserve-1 is 10,000 ha private, 1000 ha government, etc. One way to do this is to intersect the two shapefiles (Vector > Geoprocessing Tools > Intersect), which creates a new shapefile, and then extract results from the new shapefile's attribute table. However, this is time consuming. There is a Tabulate Areas function in ArcGIS that performs a similar function, where you can choose the fields to sum on (e.g., preserve name, ownership), that performs an internal raster overlay and outputs a table. But it is typically for rasters. Also, someone previously asked if a similar function exists in QGIS, but so far there were no replies. Thanks! Steven Yanoff -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Calculate-Areas-for-Vector-Overlays-tp5185581.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
