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

PostGIS trac at osgeo.org
Thu Apr 7 16:50:21 PDT 2011

#902: [raster] ST_MinMax
 Reporter:  dustymugs       |       Owner:  dustymugs            
     Type:  task            |      Status:  new                  
 Priority:  medium          |   Milestone:  PostGIS Raster Future
Component:  postgis raster  |     Version:  trunk                
 Keywords:                  |  
 As part of the process to provide complete implementations of ST_AsJPEG
 and ST_AsPNG, a method is required to reclassify larger numbers unable to
 be contained in 8BUI (JPEG and PNG) and 16BUI (PNG).  For this
 reclassification function, we need to get the min and max values of a
 band, thus ST_MinMax.

 ST_MinMax(rast raster, nband int) -> set of record

   returns one record of two columns (min, max)

 ST_MinMax(rast, 2)

 ST_MinMax(rast raster) -> set of record

   assumes that the band index = 1


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