[GRASS-user] Raster Maps

[Jonathan Agüero Valverde]

Andrew,

I think your problem is associated to the cats in vector, not the raster 
map.
Do you have a cat column in the polygon map?

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


El 26/08/2010 01:31 p.m., Andrew Lewin escribió:
> 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"
>
> Your help is much appreciated.
>
> Andrew
>
> Andrew Lewin
> andrew.lewin at sympatico.ca <mailto:andrew.lewin at sympatico.ca>
>
> Founder of Oceans and Coasts Blog <http://www.spatialconserve.com>
>
> President
> Coastal/Marine Spatial Ecologist
> Spatial-Conserve Incorporated <http://www.spatialconserve.com>
>
> Associate
> C-FOAM <http://www.c-foam.management.uottawa.ca/index.html> (Canadian 
> Fisheries, Oceans and Aquaculture Management Group)
> Telfer School of Management, University of Ottawa
>
> /
> /
>
>
>
>
> On 2010-08-26, at 2:56 PM, Andrew Lewin wrote:
>
>> Hi Everyone,
>>
>> 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.
>>
>> Can anyone tell me how I can assign categories to a raster file please?
>>
>> I am running Grass 6.4 on a Mac OSX Snow Leopard.
>>
>> Cheers,
>>
>> Andrew
>>
>> Andrew Lewin, M.Sc., Adv. Dipl. GIS
>> President
>> Spatial-Conserve Inc.
>> Oceans and Coasts Blog at www.spatialconserve.com 
>> <http://www.spatialconserve.com>
>> Email: alewin at spatialconserve.com <mailto:alewin at spatialconserve.com>
>> Tel: (905) 639-4646
>> Mobile: (905) 630-8441
>> Skype: andrew.lewin99
>> Follow me on Twitter: www.twitter.com/arlewin 
>> <http://www.twitter.com/arlewin>
>>
>>
>>
>>
>>
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