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<TITLE>Re: GRASS dissolve</TITLE>
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<FONT FACE="Skia, Verdana, Helvetica, Arial"><SPAN DEFANGED_STYLE='font-size:12.0px'>Michael,<BR>
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I also just tried to do a dissolve yesterday and it didn’t work. It SHOULD work using v.extract –d. I wanted demonstrate dissolve while working with a student yesterday and it didn’t work. I simply wanted to dissolve all the common boundaries in a map, so I didn’t specify a where clause. However, nothing was dissolved. I think that it will only dissolve polygons with common cat value, regardless of whether or not you specify. Try specifying your range of cat numbers v.extract –d cat=1-[n] (where [n] is your max cat number).<BR>
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Michael Barton<BR>
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On 4/26/05 3:57 PM, "Michael Zoldak" <Michael.Zoldak@asu.edu> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Skia, Verdana, Helvetica, Arial"><SPAN DEFANGED_STYLE='font-size:12.0px'>Dr Barton <BR>
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This is mike zoldak at IIS again with another GRASS question. I'm trying to dissolve polygon boundaries based on a shared attribute value. Is there some trick to doing this very basic GIS operation? I've tried about a hundred different permutations (literally) of v.extract and v.reclass and nothing seems to come close.<BR>
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Mike Zoldak <BR>
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____________________<BR>
C. Michael Barton, Professor of Anthropology<BR>
School of Human Evolution and Social Change<BR>
PO Box 872402<BR>
Arizona State University<BR>
Tempe, AZ 85287-2402<BR>
USA<BR>
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Phone: 480-965-6262<BR>
Fax: 480-965-7671<BR>
www: <www.public.asu.edu/~cmbarton><BR>
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