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