Changes between Version 209 and Version 210 of WKTRaster/SpecificationWorking03


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Timestamp:
07/24/12 13:51:20 (13 years ago)
Author:
pracine
Comment:

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  • WKTRaster/SpecificationWorking03

    v209 v210  
    2222== '''Objective FV.03 - Implement all the necessary versions of ST_MapAlgebra''' ==
    2323
    24 Different versions of ST_MapAlgebra are planned...
     24Different versions of ST_MapAlgebra are still to do:
    2525
    2626One raster versions:
    2727
     284) '''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.
     29Some versions were done:
     30
     31Two rasters versions:
     32
     336) '''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.
     34
     357) '''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.
     36
     378) '''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.
     38
     39One raster versions:
     40
    28411) '''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...
    2942
    … …  
    32453) '''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.
    3346
    34 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.
    35 
    3647Two rasters versions. These versions must take into account different alignment, different extents, nodata and non-existent values.
    3748
    38495) '''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.
    39 
    40 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.
    41 
    42 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.
    43 
    44 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.
    4550
    4651Parameters and details for each variant follow...