[GRASS-user] Defining quadrants

Hamish hamish_b at yahoo.com
Fri May 16 20:40:05 EDT 2008

> Any thoughts on how to relatively easily define quadrants in
> a circle around a point? I¹d like to ID the area between 315-45
> degrees (N quadrant), 45-135 degrees (E quadrant), 135-225
> (S quadrant), and 225-315 (W quadrant). I¹ve come up with a couple
> of complicated ways and wonder if I¹m missing an easier one?

v.mkgrid + a little script math seems like it could be pretty simple.

note r.buffer does use geodetic distance in lat/lon but v.buffer doesn't.
(so buffers correctly look like pears on the screen)



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