Changes between Version 71 and Version 72 of WKTRaster/SpecificationWorking01

Timestamp:

Dec 16, 2009, 2:02:23 PM (14 years ago)

Author:

pracine

Comment:

—

WKTRaster/SpecificationWorking01

@@ -244 +244 @@
  
  This function is at the base of the first version of ST_Intersection which compute the intersection between a raster and a geometry.
+
+ To avoid linking directly with PostGIS (see "Why avoid to link with PostGIS?" below) It should be implemented as a PL/pgSQL wrapper around ST_AsWKTPolygon() looking something like this: 
+
+ FOR poly IN SELECT ST_GeomFromText(ST_AsWKTPolygon(rast)) FROM table LOOP
+  RETURN NEXT poly;
+ END LOOP;
+
 
 '''ST_AsSmoothPolygon(raster) -> polygon geometry set''' - Returns a set of geometry, one for each group of pixel having the same value.