Changes between Version 67 and Version 68 of WKTRaster/SpecificationWorking01


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Timestamp:
Dec 16, 2009, 12:47:06 PM (14 years ago)
Author:
pracine
Comment:

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  • WKTRaster/SpecificationWorking01

    v67 v68  
    217217 '''Implementation details'''
    218218
    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.
    220220
    221221 The second variant (not taking NODATA values into account) is