[GRASS-user] Defining quadrants
Michael Barton
michael.barton at asu.edu
Sat May 17 11:23:03 EDT 2008
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
>
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__________________________________________
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
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