[postgis-devel] [PostGIS] #902: [raster] ST_MinMax

PostGIS trac at osgeo.org
Thu Apr 21 11:52:04 PDT 2011

#902: [raster] ST_MinMax
 Reporter:  dustymugs       |       Owner:  dustymugs            
     Type:  task            |      Status:  assigned             
 Priority:  medium          |   Milestone:  PostGIS Raster Future
Component:  postgis raster  |     Version:  trunk                
 Keywords:                  |  

Comment(by dustymugs):

 Due to time it takes for ST_MinMax to run on large rasters, I would like
 to add a function that randomly samples a percentage of the pixels of a
 specified band for an approximate min and max.  So, something like:

 1. ST_ApproxMinMax(rast raster, nband int, sample int)

   sample: a value of between 0 and 100 indicating the percentage of the
 raster to sample

Ticket URL: <http://trac.osgeo.org/postgis/ticket/902#comment:4>
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