Changes between Version 102 and Version 103 of WKTRaster/SpecificationWorking01

Timestamp:

Jan 5, 2010, 2:49:59 PM (14 years ago)

Author:

pracine

Comment:

—

WKTRaster/SpecificationWorking01

@@ -265 +265 @@
  This is a set-returning function (SRF). A "geomval" value is a complex type composed of a polygon geometry (one for each group of pixel sharing the same value) and the value associated with this geometry. These values are always returned as a value of type double precision. The shape of each polygon follow pixels edges.
 
- Variant 1: ST_AsPolygon(raster) -> geomval set -- default to band # 1[[BR]]
- Variant 2: ST_AsPolygon(raster, integer, 'UNGROUP')[[BR]]
- Variant 3: ST_AsPolygon(raster, 'UNGROUP') -- default to band # 1
+ Variant 1: ST_AsPolygon(raster) -> geomval set -- default to band # 1
+
+ Variant 2: ST_AsPolygon(raster, integer, 'CONTIGUOUS')[[BR]]
+ Variant 3: ST_AsPolygon(raster, 'CONTIGUOUS') -- default to band # 1
 
  This function should be used with precaution on raster with float pixel type as it could return one "geomval" (or polygon) per pixel. This kind of raster should be reclassified (using the planned ST_Reclassify(raster,...) function) before using ST_AsPolygon().
 
- Variant 2 splits every resulting complex polygon sharing the same value into simple (or singlepart) polygons.
+ Variant 2 & 3 splits every resulting complex polygon sharing the same value into simple (or singlepart) polygons.
 
  '''Implementation details'''