Changes between Version 67 and Version 68 of WKTRaster/SpecificationWorking01
- Timestamp:
- Dec 16, 2009, 12:47:06 PM (14 years ago)
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WKTRaster/SpecificationWorking01
v67 v68 217 217 '''Implementation details''' 218 218 219 The first variant (taking NODATA values into account) ST_ConvexHull(raster) could be roughly implemented with a SQL or PL/pgSQL function looking like 'SELECT ST_ BuildArea(ST_ExteriorRing(ST_Shape(raster)))'219 The first variant (taking NODATA values into account) ST_ConvexHull(raster) could be roughly implemented with a SQL or PL/pgSQL function looking like 'SELECT ST_ConvexHull(ST_Shape(raster))'. For sure computing only the external edge (without considering eventual holes like ST_Shape() does) should be faster. This imply writing the equivalent of a more simple version of ST_Shape. 220 220 221 221 The second variant (not taking NODATA values into account) is