Changes between Version 72 and Version 73 of WKTRaster/SpecificationWorking01

Timestamp:

Dec 16, 2009, 2:18:10 PM (14 years ago)

Author:

pracine

Comment:

—

WKTRaster/SpecificationWorking01

@@ -251 +251 @@
  END LOOP;
 
-
-'''ST_AsSmoothPolygon(raster) -> polygon geometry set''' - Returns a set of geometry, one for each group of pixel having the same value.
-
- The shape of each polygon is smooted to remove stair effects.
-
+'''ST_AsWKTPolygon(raster) -> text set''' - Returns a set of text representation of geometry, one for each group of pixel having the same value.
+
+ '''Implementation details'''
+ 
+ This function construct the WKT strings representing the geometries grouping pixels of a raster having the same value. It does not directly construct geometries and therefore prevent WKT Raster from having to link with liblwgeom.a (see "Why avoid to link with PostGIS?" below)
 
 ST_GetBBox(raster) (not yet implemented but planned) is replaced with ST_Envelope() since there is no equivalent function in PostGIS.