[postgis-devel] [PostGIS] #1193: [raster] Add the possibility to aggregate values when rescaling with ST_Rescale()

[PostGIS]

#1193: [raster] Add the possibility to aggregate values when rescaling with
ST_Rescale()
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 Reporter:  pracine         |       Owner:  pracine              
     Type:  enhancement     |      Status:  new                  
 Priority:  low             |   Milestone:  PostGIS Raster Future
Component:  postgis raster  |     Version:  trunk                
 Keywords:                  |  
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 It would be nice to be able to compute aggregate values when rescaling a
 raster like this:

 http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z00000034000000.htm

 So in addition to the standard resampling algorythms (NearestNeighbor,
 Bilinear, Cubic, CubicSpline and Lanczos) we could use "sum", "count",
 "mean", "max", "min", "median".

 The count would count the number of pixel with value (ignoring nodata
 values).

 Event if this operation is VERY similar to rescale it could be named
 ST_Aggregate instead. It would accept a size (in pixel) for the aggregate
 pixel area and an aggregate type (sum", "count", "mean", "max", "min",
 "median").

 If the resample code base (based on GDAL) could be reuse or if a totally
 new function has to be written is to be determined.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/1193>
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