Changes between Version 136 and Version 137 of WKTRaster/SpecificationWorking03


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Timestamp:
07/08/11 11:05:25 (13 years ago)
Author:
pracine
Comment:

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  • WKTRaster/SpecificationWorking03

    v136 v137  
    157157One raster versions:
    158158
    159 1) '''ST_MapAlgebraExpr() -''' A one raster version taking an '''expression''' of one pixel at a time. Already implemented...
    160 
    161 2) '''ST_MapAlgebraFct() -''' 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() -''' 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() -''' 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.
     1591) '''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
     1612) '''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
     1633) '''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
     1654) '''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.
    166166
    167167Two rasters versions. These versions must take into account different alignment, different extents, nodata and non-existent values.
    168168
    169 5) '''ST_MapAlgebraExpr() -''' A two rasters version taking an expression of two pixels at a time, one from each rasters.
    170 
    171 6) '''ST_MapAlgebraExpr() -''' A two rasters version taking a '''table name and a 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() -''' 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() -''' 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.
     1695) '''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
     1716) '''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
     1737) '''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
     1758) '''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.
    176176
    177177Parameters and details for each variant follow...