Hi Chathura, For vector data try the fTools. Look under Vector -- Research Tools, there are several ie Random Selection & Random Selection within subsets. This would do for selecting already present polygon/point type features & export selected layer from table of contents as a new layer.
To select only a range of coordinates (point based data) you can add the x & y columns to attribute table. select layer for edit, add column of type real (remember to set precision to > 2) & from Geometry group in Function list window select $x or $y. Save & stop editing, you may notice that the columns go null -- this is a bug (i'm using 1.8 windows 7), close & reopen attribute table. You can now use the query builder to filter out a range of values, export selection & apply the fTools discussed above. For more advanced options I would look at the mangeR plugin. Plugins of interest: Point Sampling tool Spatial Data Analysis for point pattern -- very extensive functionality Cheers, Richard -- View this message in context: http://osgeo-org.1560.n6.nabble.com/random-locations-sample-from-the-actual-map-tp4995315p4995384.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
