Changes between Version 178 and Version 179 of WKTRaster/SpecificationWorking03

Timestamp:

11/29/11 11:27:48 (13 years ago)

Author:

pracine

Comment:

--

WKTRaster/SpecificationWorking03

@@ -524 +524 @@
  END IF
 
+----
+== '''Objective FV.22 - Making raster_columns and raster_overview as views''' ==
+
+ Following the conversion of geometry_columns to a view in PostGIS, it is planned to do the same with raster_column and raster_overview for the raster part. Converting to a view has a number of advantages:
+
+PostGIS is using the typmod feature of PostgreSQL to 'store' metadata about a table and then display them in the geometry_column view. Unfortunately the typmod is limited to XXX byte and there is too much information to 'store' about a raster table to use typmod. PostGIS raster will therefore use another technique to 'store' metadata about a raster table: constraint. A set of constraint will be applied to a raster table and those constraint will be read and displyed by the raster_column view.
 
 ----