| 159 | | 1) '''ST_MapAlgebraExpr(rast raster, band int, pixeltype text, expression text, nodataexpr text) -''' A one raster version taking an '''expression''' of one pixel at a time. Already implemented... |
| 160 | | |
| 161 | | 2) '''ST_MapAlgebraFct(rast raster, band int, pixeltype text, funcname text[, funcargs text]) -''' A one raster version taking a '''user defined function''' (with optional parameters) of one pixel at a time. The function is a user defined PL/pgSQL function taking a float8 value and returning a value. [http://trac.osgeo.org/postgis/ticket/860 Code was developped by David Zwarg], needs to be integrated in the source tree. This version is much faster than 1) but requires the user to write a PL/pgSQL function. |
| 162 | | |
| 163 | | 3) '''ST_MapAlgebraFctNgb(rast raster, band int, pixeltype text, radius int, funcname text[, funcargs text]) -''' A one raster version taking a '''user defined function''' (with optional parameters) of the set of first, second, etc... '''neighbours''' of a pixel. The function is a user defined PL/pgSQL function taking a matrix containing the neighbour values and returning one value. Code do not exist yet but will be very much similar to 2). Out of bound pixels values are set to NULL. This version requires the user to write a PL/pgSQL function. Many predefined function should be delivered. |
| 164 | | |
| 165 | | 4) '''ST_MapAlgebraFctNgb(rasttable text, rastcolumn text, band int, pixeltype text, radius int, funcname text[, funcargs text]) -''' A one raster version taking a '''table name and a raster column name''' (in order to work on a '''tiled coverage''') and a '''user defined function''' (with optional parameters) of the set of first, second, etc... '''neighbours''' of a pixel. The passed matrix should include values for out of bound pixels taken from neighbour tiles. |
| | 159 | 1) '''ST_MapAlgebraExpr('''rast raster, band int, pixeltype text, expression text, nodataexpr text''') -''' A one raster version taking an '''expression''' of one pixel at a time. Already implemented... |
| | 160 | |
| | 161 | 2) '''ST_MapAlgebraFct('''rast raster, band int, pixeltype text, funcname text[, funcargs text]''') -''' A one raster version taking a '''user defined function''' (with optional parameters) of one pixel at a time. The function is a user defined PL/pgSQL function taking a float8 value and returning a value. [http://trac.osgeo.org/postgis/ticket/860 Code was developped by David Zwarg], needs to be integrated in the source tree. This version is much faster than 1) but requires the user to write a PL/pgSQL function. |
| | 162 | |
| | 163 | 3) '''ST_MapAlgebraFctNgb('''rast raster, band int, pixeltype text, radius int, funcname text[, funcargs text]''') -''' A one raster version taking a '''user defined function''' (with optional parameters) of the set of first, second, etc... '''neighbours''' of a pixel. The function is a user defined PL/pgSQL function taking a matrix containing the neighbour values and returning one value. Code do not exist yet but will be very much similar to 2). Out of bound pixels values are set to NULL. This version requires the user to write a PL/pgSQL function. Many predefined function should be delivered. |
| | 164 | |
| | 165 | 4) '''ST_MapAlgebraFctNgb('''rasttable text, rastcolumn text, band int, pixeltype text, radius int, funcname text[, funcargs text]''') -''' A one raster version taking a '''table name and a raster column name''' (in order to work on a '''tiled coverage''') and a '''user defined function''' (with optional parameters) of the set of first, second, etc... '''neighbours''' of a pixel. The passed matrix should include values for out of bound pixels taken from neighbour tiles. |
| 169 | | 5) '''ST_MapAlgebraExpr(rast1 raster, band1 integer, rast2 raster, band2 integer, pixeltype text, extentexpr text, expression text, nodata1expr text, nodata2expr text, nodatanodatadaexpr text) -''' A two rasters version taking an expression of two pixels at a time, one from each rasters. |
| 170 | | |
| 171 | | 6) '''ST_MapAlgebraExpr(rast1table text, rast1column text, band1 integer, rast2table text, rast2column text, band2 integer, pixeltype text, extentexpr text, expression text, nodata1expr text, nodata2expr text, nodatanodatadaexpr text) -''' A two rasters version taking '''two table names and two raster column name''' (in order to work on a '''tiled coverage''') and an expression of two pixels at a time, one from each rasters. |
| 172 | | |
| 173 | | 7) '''ST_MapAlgebraFct(rast1 raster, band1 integer, rast2 raster, band2 integer, pixeltype text, extentexpr text, funcname text[, funcargs text]) -''' A two rasters version taking a '''user defined function''' (with optional parameters) of two pixels at a time, one from each rasters. The function is a user defined PL/pgSQL function taking two float8 values and returning one value. |
| 174 | | |
| 175 | | 8) '''ST_MapAlgebraFct(rast1table text, rast1column text, band1 integer, rast2table text, rast2column text, band2 integer, pixeltype text, extentexpr text, funcname text[, funcargs text]) -''' A two rasters version taking a '''table name and a raster column name''' (in order to work on a '''tiled coverage''') and a '''user defined function''' (with optional parameters) of two pixels at a time, one from each rasters. The function is a user defined PL/pgSQL function taking two float8 values and returning one value. Non-existent values are found in the neighbour tiles when possible. |
| | 169 | 5) '''ST_MapAlgebraExpr('''rast1 raster, band1 integer, rast2 raster, band2 integer, pixeltype text, extentexpr text, expression text, nodata1expr text, nodata2expr text, nodatanodatadaexpr text''') -''' A two rasters version taking an expression of two pixels at a time, one from each rasters. |
| | 170 | |
| | 171 | 6) '''ST_MapAlgebraExpr('''rast1table text, rast1column text, band1 integer, rast2table text, rast2column text, band2 integer, pixeltype text, extentexpr text, expression text, nodata1expr text, nodata2expr text, nodatanodatadaexpr text''') -''' A two rasters version taking '''two table names and two raster column name''' (in order to work on a '''tiled coverage''') and an expression of two pixels at a time, one from each rasters. |
| | 172 | |
| | 173 | 7) '''ST_MapAlgebraFct('''rast1 raster, band1 integer, rast2 raster, band2 integer, pixeltype text, extentexpr text, funcname text[, funcargs text]''') -''' A two rasters version taking a '''user defined function''' (with optional parameters) of two pixels at a time, one from each rasters. The function is a user defined PL/pgSQL function taking two float8 values and returning one value. |
| | 174 | |
| | 175 | 8) '''ST_MapAlgebraFct('''rast1table text, rast1column text, band1 integer, rast2table text, rast2column text, band2 integer, pixeltype text, extentexpr text, funcname text[, funcargs text]''') -''' A two rasters version taking a '''table name and a raster column name''' (in order to work on a '''tiled coverage''') and a '''user defined function''' (with optional parameters) of two pixels at a time, one from each rasters. The function is a user defined PL/pgSQL function taking two float8 values and returning one value. Non-existent values are found in the neighbour tiles when possible. |
