Changes between Version 103 and Version 104 of WKTRaster/SpecificationWorking01
- Timestamp:
- Jan 5, 2010, 2:57:06 PM (14 years ago)
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WKTRaster/SpecificationWorking01
v103 v104 346 346 It might be faster to skip test 2) if this test is not signicantly faster than test 3). 347 347 348 '''ST_Intersection(raster, integer, geometry) -> geometry''' - Returns a geometry that representsthe shared portion of the geometry and the raster areas sharing a common meaningfull values.348 '''ST_Intersection(raster, integer, geometry) -> geometry''' - Returns a set of "geomval" value representing the shared portion of the geometry and the raster areas sharing a common meaningfull values. 349 349 350 350 Variant 1: … … 374 374 ST_Intersection(raster, raster, 'geometry') -> geometry -- default to band # 1 375 375 376 Returns a geometry that represents the point set intersection of the geometry and the raster. The raster is first polygonised using ST_AsPolygon(raster) and ST_Intersection(geometry, geometry) is then performed between the provided geometry and all the geometries resulting from the polygonisation of the raster.376 This is a set-returning function (SRF). It returns a set of "geomval" representing the point set intersection of the geometry and the areas of the raster sharing a common meaningfull value (NODATA values ARE taken into account). The raster is first polygonised using ST_AsPolygon(raster) and ST_Intersection(geometry, geometry) is then performed between the provided geometry and all the geometries resulting from the polygonisation of the raster. 377 377 378 378 If the geometries do not share any space (are disjoint), then an empty geometry collection is returned.