I am not getting any responses. :-) Am I doing something really dumb? Is this the right forum for this kind of question?
Thanks, Aren On Sun, Feb 13, 2011 at 8:02 AM, Aren Cambre <a...@arencambre.com> wrote: > Maybe I could clarify. Here's the command: > *v.kernel --verbose input=master_grass7 output=master_grass7a_heatmap > stddeviation=.0001* > > Here's the command output: > *STDDEV: 0.000100* > *RES: 200.000000 ROWS: 1000 COLS: 1000* > * > * > *Writing output raster map using smooth parameter=0.000100.* > * > * > *Normalising factor=0.000000.* > *Maximum value in output: 0.000000e+000.* > > If I change stddeviation to *100*, here's what I get: > *STDDEV: 100.000000* > *RES: 200.000000 ROWS: 1000 COLS: 1000* > * > * > *Writing output raster map using smooth parameter=100.000000.* > * > * > *Normalising factor=64826.350188.* > *Maximum value in output: 0.000000e+000.* > > Either way, the resulting raster is a large salmon/pink square. I have no > idea what I'm doing wrong. I've tried varying the *stddeviation *parameter > from 100 to .0001 and some values in between, and I don't get anything > different. Heck, I just now used 1000000 and .000001 and got nothing > different. > > I was really hoping to make a high res heat map of these 2.5 million points > and overlay on to a street map layer. > > Aren > > > On Fri, Feb 11, 2011 at 9:45 PM, Aren Cambre <a...@arencambre.com> wrote: > >> I am not clear how to get useful results out of v.kernel. I have a vector >> layer imported from PostGIS that has about 2.5 million points. I want to >> make a high density raster to show where these points are clustered. I can >> get the vector layer to display in GRASS just fine, albeit without >> attributes because of http://trac.osgeo.org/grass/ticket/1274. >> >> It's not clear to me, based on >> http://grass.fbk.eu/gdp/html_grass64/v.kernel.html, how you can get it to >> do something besides make a big, pinkish (salmon-red?) square? >> >> Aren >> > >
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