[GRASSLIST:5870] Looking for Advice on Buffering

GRASS GRASS user
1

I have been working with Grass 6.0 to try to output elevation values from a
raster map at specific intervals from coordinates. I have been sucessful at
getting coordinates into Grass. However, I have not found a way to create
buffers or concentric circles that overlap and maintain the centroid
attribute. I want to have the circles in miles (like in the raster buffer)
rather than map units (like in the vector buffer). I am willing to try to
write code for a solution, but I have limited experience.

Does anyone have a suggestion for how I should approach this task?

Thanks for taking the time to read this message, and for briefly thinking
about it.

Cheers,
Nathan

2

Nathan Wales wrote:

I have been working with Grass 6.0 to try to output elevation values from a raster map at specific intervals from coordinates. I have been sucessful at getting coordinates into Grass. However, I have not found a way to create buffers or concentric circles that overlap and maintain the centroid attribute. I want to have the circles in miles (like in the raster buffer) rather than map units (like in the vector buffer). I am willing to try to write code for a solution, but I have limited experience.

Does anyone have a suggestion for how I should approach this task?

Thanks for taking the time to read this message, and for briefly thinking about it.

Cheers,
Nathan

You have to overlay individual buffers in loop, for example:

v.in.ascii -e output=buffers

for C in 1 2 3
do
     v.extract input=points output=point list=$C
     v.buffer input=point output=buffer
     v.overlay -t ainput=buffers binput=buffer \
                  output=tmp olayer=0,1,1
     g.copy vect=tmp,buffers
done

Radim