Changes between Version 38 and Version 39 of WKTRaster/SpecificationWorking02
 Timestamp:
 Sep 21, 2010, 8:04:55 AM (10 years ago)
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WKTRaster/SpecificationWorking02
v38 v39 37 37 Returns a one band raster which pixel values are the mathematical expression of another raster band. 38 38 39 The expression is any PostgreSQL valid expression returning a number. In the one raster version of ST_MapAlgebra, the value of the current pixel is expressed in the expression by "rast". E.g. "cos(rast)" or "rast / 2"39 The expression is any PostgreSQL valid expression returning a number. This expression can contain any userdefined function. In the one raster version of ST_MapAlgebra, the value of the current pixel is expressed in the expression by "rast". E.g. 'cos(rast)' or 'rast / 2' 40 40 41 41 An extra nodata value expression, applying only to nodata values pixel, can be provided. 42 43 It is not possible yet to refer to neighbour pixel values. 42 44 43 45 In the one raster version of ST_MapAlgebra, the resulting raster conserve the size, the georeference, the alignment and the SRID of the provided raster.