[GRASS-user] strategy required

John Field JohnField at ozemail.com.au
Sun Jun 22 07:25:42 EDT 2008

Sorry, I forgot to say I'm using the native Windows version of Grass.


At 08:53 PM 22/06/2008, John Field wrote:
>G'day Grass listers,
>I'm very new at using Grass, and I'd be most appreciative if someone 
>could suggest a strategy to accomplish the following:
>I have a map of part of Australia, subdivided into local government 
>areas (LGAs).  Both the coastline and the LGA boundaries are vector 
>layers, referenced by latitude and longitude.
>I want to sample the map at each point on a grid (say at each 0.1 of 
>lat and 0.1 of long).  At a sample point I will place a rectangle of 
>a given size oriented in a NW-SE direction, with the westernmost 
>corner of the rectangle on the sample point.  I then want to 
>calculate the proportion of each LGA which is enclosed in the 
>rectangle (there may be up to 6 or so).
>I'm not familiar enough with Grass to know how best to approach 
>this.  I'd be very grateful for any suggested strategies.
>With thanks,
>John Field
>Adelaide, South Australia
>grass-user mailing list
>grass-user at lists.osgeo.org
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