ST_AsGDALRaster
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Name

ST_AsGDALRaster — Return the raster tile in the designated GDAL Raster format. Raster formats are one of those supported by your compiled library. Use ST_GDALRasters() to get a list of formats supported by your library.

Synopsis

bytea ST_AsGDALRaster(raster rast, text format, text[] options=NULL, integer srid=sameassource);

Description

Returns the raster tile in the designated format. Arguments are itemized below:

  • format format to output. This is dependent on the drivers compiled in your libgdal library. Generally available are 'JPEG', 'GTIff', 'PNG'. Use ST_GDALDrivers to get a list of formats supported by your library.

  • options text array of GDAL options. Valid options are dependent on the format. Refer to GDAL Raster format options for more details.

  • srs The proj4text or srtext (from spatial_ref_sys) to embed in the image

Availability: 2.0.0 - requires GDAL >= 1.6.0.

JPEG Output Examples

SELECT ST_AsGDALRaster(rast, 'JPEG') As rastjpg
FROM dummy_rast WHERE rid=1;

SELECT ST_AsGDALRaster(rast, 'JPEG', ARRAY['QUALITY=50']) As rastjpg
FROM dummy_rast WHERE rid=2;

GTIFF Output Examples

SELECT ST_AsGDALRaster(rast, 'GTiff') As rastjpg
FROM dummy_rast WHERE rid=2;

-- Out GeoTiff with jpeg compression, 90% quality
SELECT ST_AsGDALRaster(rast, 'GTiff',  
  ARRAY['COMPRESS=JPEG', 'JPEG_QUALITY=90'], 
  4269) As rasttiff
FROM dummy_rast WHERE rid=2;

See Also

Section 5.3, “Building Custom Applications with PostGIS Raster”, ST_GDALDrivers, ST_SRID

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