[postgis-devel] [PostGIS] #348: [wktraster] st_raster_envelope & st_raster_to_box2d return different results

PostGIS trac at osgeo.org
Wed Jan 20 10:32:01 PST 2010


#348: [wktraster] st_raster_envelope & st_raster_to_box2d return different
results
------------------------+---------------------------------------------------
  Reporter:  pracine    |       Owner:  pracine        
      Type:  defect     |      Status:  assigned       
  Priority:  high       |   Milestone:  WKTRaster 0.1.6
 Component:  wktraster  |     Version:  trunk          
Resolution:             |    Keywords:                 
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Comment (by jorgearevalo):

 Replying to [comment:6 jorgearevalo]:
 > I've implemented the ST_Envelope function. The difference with
 ST_ConvexHull is the affine transformation performed in the case of
 ST_Envelope function doesn't take into account the rotation (so, only
 scale + traslation). Is it ok?
 >
 > New ST_Envelope function committed in r5142

 I reply myself to note I should "floor" the raster coordinates on
 ST_Envelope before constructing the polygon, to add a little buffer around
 the raster.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/348#comment:7>
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