ST_SetSkew
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Name

ST_SetSkew — Coloca as georreferências X e Y distorcidas (ou parâmetro de rotação). Se somente um passar, coloca o X e o Y no mesmo valor.

Synopsis

raster ST_SetSkew(raster rast, float8 skewxy);

raster ST_SetSkew(raster rast, float8 skewx, float8 skewy);

Descrição

Coloca as georreferências X e Y distorcidas (ou parâmetro de rotação). Se somente um passar, coloca o X e o Y no mesmo valor. Recorra a World File para mais detalhes.

Exemplos

-- Example 1
UPDATE dummy_rast SET rast = ST_SetSkew(rast,1,2) WHERE rid = 1;
SELECT rid, ST_SkewX(rast) As skewx, ST_SkewY(rast) As skewy,
    ST_GeoReference(rast) as georef
FROM dummy_rast WHERE rid = 1;

rid | skewx | skewy |    georef
----+-------+-------+--------------
  1 |     1 |     2 | 2.0000000000
                    : 2.0000000000
                    : 1.0000000000
                    : 3.0000000000
                    : 0.5000000000
                    : 0.5000000000

                
-- Example 2 set both to same number:
UPDATE dummy_rast SET rast = ST_SetSkew(rast,0) WHERE rid = 1;
SELECT rid, ST_SkewX(rast) As skewx, ST_SkewY(rast) As skewy,
    ST_GeoReference(rast) as georef
FROM dummy_rast WHERE rid = 1;

 rid | skewx | skewy |    georef
-----+-------+-------+--------------
   1 |     0 |     0 | 2.0000000000
                     : 0.0000000000
                     : 0.0000000000
                     : 3.0000000000
                     : 0.5000000000
                     : 0.5000000000