[GRASS-user] Defining quadrants

[Michael Barton]

I think I need 'pie' slices of a raster circle.

Michael


On 5/16/08 5:40 PM, "Hamish" <hamish_b at yahoo.com> wrote:

> Michael:
>> 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)
> 
> 
> 
> Hamish
> 
> 
> 
> 
> 
> 

__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton