PostGIS
Name
ST_RasterToWorldCoordX — Returns the geometric X coordinate upper left of a raster, column and row. Numbering of columns and rows starts at 1.
Synopsis
+float8 +ST_RasterToWorldCoordX(+`raster `+rast, integer
xcolumn`)`;
+float8 +ST_RasterToWorldCoordX(+`raster `+rast, integer
xcolumn, integer yrow`)`;
Description
Returns the upper left X coordinate of a raster column row in geometric units of the georeferenced raster. Numbering of columns and rows starts at 1 but if you pass in a negative number or number higher than number of columns in raster, it will give you coordinates outside of the raster file to left or right with the assumption that the skew and pixel sizes are same as selected raster.
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Changed: 2.1.0 In prior versions, this was called ST_Raster2WorldCoordX
Examples
-- non-skewed raster providing column is sufficient
SELECT rid, ST_RasterToWorldCoordX(rast,1) As x1coord,
ST_RasterToWorldCoordX(rast,2) As x2coord,
ST_ScaleX(rast) As pixelx
FROM dummy_rast;
rid | x1coord | x2coord | pixelx
-----+------------+-----------+--------
1 | 0.5 | 2.5 | 2
2 | 3427927.75 | 3427927.8 | 0.05-- for fun lets skew it
SELECT rid, ST_RasterToWorldCoordX(rast, 1, 1) As x1coord,
ST_RasterToWorldCoordX(rast, 2, 3) As x2coord,
ST_ScaleX(rast) As pixelx
FROM (SELECT rid, ST_SetSkew(rast, 100.5, 0) As rast FROM dummy_rast) As foo;
rid | x1coord | x2coord | pixelx
-----+------------+-----------+--------
1 | 0.5 | 203.5 | 2
2 | 3427927.75 | 3428128.8 | 0.05