Changes between Version 94 and Version 95 of WKTRaster/SpecificationWorking01


Ignore:
Timestamp:
Dec 22, 2009, 10:35:15 AM (14 years ago)
Author:
pracine
Comment:

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  • WKTRaster/SpecificationWorking01

    v94 v95  
    263263 This function could be roughly implemented as a SQL function looking like 'SELECT ST_Collect((ST_AsPolygon(raster)).geom)'. For sure a more specialised version could be faster than ST_AsPolygon.
    264264
     265[[Image(WKTRasterShape.gif)]]
     266
    265267'''ST_AsPolygon(raster) -> geomval set''' - Returns a set of "geomval" value, one for each contiguous group of pixel sharing the same value.
    266268
    … …  
    292294 SELECT (gv).val, (gv).geom FROM (SELECT ST_AsPolygon(rast) gv FROM sometable) foo
    293295
     296[[Image(WKTRasterAsPolygon.gif)]]
    294297
    295298'''ST_AsWKTPolygon(raster) -> wktgeomval set''' - Returns a set of "geomval" value, one for each contiguous group of pixel sharing the same value.