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Andrew,<br>
<br>
I think your problem is associated to the cats in vector, not the
raster map.<br>
Do you have a cat column in the polygon map?<br>
<br>
<pre class="moz-signature" cols="72">Ing. Jonathan Agüero Valverde, Ph.D.
Profesor e Investigador
Programa de Investigación en Desarrollo Urbano Sostenible (ProDUS)
Escuela de Ingeniería Civil
Universidad de Costa Rica
</pre>
<br>
El 26/08/2010 01:31 p.m., Andrew Lewin escribió:
<blockquote cite="mid:BLU0-SMTP28695AECE27BBC11FC3AFAED850@phx.gbl"
type="cite">Okay, so I found out more information. I reclassed the
raster layer to give myself some categories; however, when I tried to
run v.rast.stats I got an error saying "No categories found in raster
map"
<div><br>
</div>
<div>Your help is much appreciated.</div>
<div><br>
</div>
<div>Andrew</div>
<div><br>
<div><span class="Apple-style-span"
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<div style="word-wrap: break-word;">
<div>Andrew Lewin</div>
<div><a moz-do-not-send="true" href="mailto:andrew.lewin@sympatico.ca">andrew.lewin@sympatico.ca</a></div>
<div><br>
</div>
<div>Founder of <a moz-do-not-send="true"
href="http://www.spatialconserve.com">Oceans and Coasts Blog</a></div>
<div><br>
</div>
<div>President </div>
<div>Coastal/Marine Spatial Ecologist</div>
<div><a moz-do-not-send="true" href="http://www.spatialconserve.com">Spatial-Conserve
Incorporated</a></div>
<div><br>
</div>
<div>Associate </div>
<div><a moz-do-not-send="true"
href="http://www.c-foam.management.uottawa.ca/index.html">C-FOAM</a> (Canadian
Fisheries, Oceans and Aquaculture Management Group)</div>
<div>Telfer School of Management, University of Ottawa</div>
<div><br>
</div>
<div><font class="Apple-style-span" color="#808080" face="Arial"><span
class="Apple-style-span" style="font-size: x-small;"><i><br>
</i></span></font></div>
</div>
</span><br class="Apple-interchange-newline">
</div>
</span><br class="Apple-interchange-newline">
</span><br class="Apple-interchange-newline">
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<br>
<div>
<div>On 2010-08-26, at 2:56 PM, Andrew Lewin wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div>Hi Everyone,<br>
<br>
I would like to create a raster map of temperature values using
v.surf.idw and calculate the median temperature value for each
state/province in North America. I currently have a point shapefile of
temperature values covering all of North America, a North American area
shapefile (both imported using v.in.ogr). I would like to use
v.rast.stats to calculate the median value for each state/province;
however, I get an "Error: no categories found in raster map". I
created the temperature value raster using v.surf.idw and there are no
categories associated with this file.<br>
<br>
Can anyone tell me how I can assign categories to a raster file please?<br>
<br>
I am running Grass 6.4 on a Mac OSX Snow Leopard.<br>
<br>
Cheers,<br>
<br>
Andrew<br>
<br>
Andrew Lewin, M.Sc., Adv. Dipl. GIS<br>
President<br>
Spatial-Conserve Inc.<br>
Oceans and Coasts Blog at <a moz-do-not-send="true"
href="http://www.spatialconserve.com">www.spatialconserve.com</a><br>
Email: <a moz-do-not-send="true"
href="mailto:alewin@spatialconserve.com">alewin@spatialconserve.com</a><br>
Tel: (905) 639-4646<br>
Mobile: (905) 630-8441<br>
Skype: andrew.lewin99<br>
Follow me on Twitter: <a moz-do-not-send="true"
href="http://www.twitter.com/arlewin">www.twitter.com/arlewin</a><br>
<br>
<br>
<br>
<br>
<br>
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