Changes between Version 116 and Version 117 of WKTRaster/SpecificationWorking03


Ignore:
Timestamp:
06/13/11 15:27:51 (13 years ago)
Author:
pracine
Comment:

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  • WKTRaster/SpecificationWorking03

    v116 v117  
    147147
    148148'''Details for 5) to 8) Two rasters versions'''
     149
     150 Specifications of two rasters versions of ST_MapAlgebra are still in progress as a new optimised version, filling large areas of same value more quickly and dependent on ST_SetValues() described in [http://trac.osgeo.org/postgis/wiki/WKTRaster/SpecificationWorking02 Objective 2.0.05], is planned. See http://trac.osgeo.org/postgis/browser/trunk/raster/scripts/plpgsql/st_mapalgebra_optimized.sql The idea is to set large areas of the resulting raster when possible using a process more similar  to memcpy than by computing one pixel value at a time.
    149151
    150152 -Both rasters must have the same SRID. If not, ST_MapAlgebra should return an error: "ERROR:  Operation on two geometries with different SRIDs"
    … …  
    179181  ST_Resample(ST_MapAlgebra(raster, [raster, ...] 'mathematical expression', integer), rastergrid)
    180182        PR: I think this would greatly contribute to simplify the API.
    181 
    182  Specifications of ST_MapAlgebra on two rasters are still in progress as a new optimised version, filling large areas of same value more quickly, is planned. See http://trac.osgeo.org/postgis/browser/trunk/raster/scripts/plpgsql/st_mapalgebra_optimized.sql
    183183
    184184 See discussion in http://trac.osgeo.org/postgis/ticket/590