Rainer, I suggest to try the snap parameters of v.in.ogr first. Maybe the SHAPE file is full of gaps and slivers (commonly found, even in governmental data). *Small* snapping values might cure it. Be careful to not snap, say, Africa to a triangle :)
Markus On Mon, Jun 23, 2008 at 12:13 PM, Rainer M Krug <[EMAIL PROTECTED]> wrote: > Hi > > I am importing a vector layer from a shape file as follow, and get the > warning below: > > > v.in.ogr dsn=/home/rkrug/Documents/Projects/AlienSpread/data/input/ > layer=fireHistory output=fireHistory --overwrite > > > WARNING: 703 areas represent more (overlapping) features, because polygons > overlap in input layer(s). Such areas are linked to more than 1 > row in attribute table. The number of features for those areas is > stored as category in layer 2 > > > I am aware of that, and I want to create a raster layer with the > number of features overlapping in each location. As I ultimately need > a raster layer, I thought to use the following, but I get the error > message below: > > > v.to.rast input=fireHistory layer=2 output=mf use=attr column=category > --overwrite > > ERROR: Unable to get layer info for vector map > > Why is that? > > Is there another way of getting the number of overlapping features per > cell? > > Thanks > > Rainer > > > -- > Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation > Biology, UCT), Dipl. Phys. (Germany) > > Plant Conservation Unit > Department of Botany > University of Cape Town > Rondebosch 7701 > South Africa > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > -- Open Source Geospatial Foundation http://www.osgeo.org/ http://www.grassbook.org/
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