On Tue, 2008-02-12 at 10:21 -0800, Rick Reeves wrote: > Hello: > > I'm using v.in.ogr to clip a polygon set (in this case, county > boundaries) to > the boundary of a (rectangular) raster image. > > As far as I know, this is the only way to do this; I tried to create a > new location > with the same boundaries and import the polygon shapefile into the > location, but > clipping did not occur as expected.
Sorry for suggesting the obvious things (which you might have checked): * if you want to clip based on a rectangular, did you try the "spatial" parameter (or subregion in the GUI)? -- grab the extents of your rectangular raster with r.info > > In any case, v.in.ogr did not clip the 'boundary polygons' to the the > edge of the > raster image, but included the entire polygon. Only excluded polygons > completely > outside of the bounding box are clipped. > > There MUST be a way to clip all polygons to the bounding box edge. Can any > one suggest a way? > > The second edition of Netler's book discusses v.cutregion.sh and > v.cutter methods, > but I cant find any evidence of these in GRASS 6.2. v.cutter is in grass5 --> http://grass.itc.it/gdp/html_grass5/vector.html Probably not ported in grass6 -- but it's not really necessary. > > Thanks for any help, > Rick Reeves > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user -- Nikos Alexandris . Department of Remote Sensing & Landscape Information Systems Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University Freiburg . Tel. +49 (0) 761 203 3697 / Fax. +49 (0) 761 203 3701 / Skype: Nikos.Alexandris . Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
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