[postgis-tickets] [PostGIS] #2312: [raster] st_circle

[PostGIS]

#2312: [raster] st_circle
-------------------------+--------------------------------------------------
 Reporter:  nclay        |       Owner:  dustymugs     
     Type:  enhancement  |      Status:  new           
 Priority:  medium       |   Milestone:  PostGIS Future
Component:  raster       |     Version:  trunk         
 Keywords:               |  
-------------------------+--------------------------------------------------

Comment(by nclay):

 I've all ready written a function but have yet to test, that takes the map
 algebra window in and returns only the cells that fall within a r1,R2,
 thetaStart, thetaEnd:


 {{{
  _st_focal( value double precision[][][],z integer, r1 integer, R2
 integer, thetaStart double precision, thetaEnd double precision)
 }}}

 I ticked these functions as separate functions, we could use st_focal for
 all of them as they are really subsets of each other.

 Yes, it could be implemented as a mask. Then the focal function would be
 something like:

 {{{
  _st_focal( value double precision[][][],mask double precision[][][] )
 }}}

 It may be faster?

 Thanks,

 Nathan

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2312#comment:4>
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