Changes between Version 216 and Version 217 of WKTRaster

Timestamp:

Jul 24, 2012, 9:34:28 AM (12 years ago)

Author:

pracine

Comment:

—

WKTRaster

@@ -163 +163 @@
  * each raster tile has a pixel size, a width and a height, a variable number of band, a pixel type per band and a nodata value per band. Everything essential to do base raster GIS operations. 
 
-'''...is an extension of PostGIS to be installed separately'''
- * merge with PostGIS might occur in the future... 
+'''...is fully integrated into PostGIS...'''
+ * since PostGIS version 2.0... 
 
 '''...has an import/export mechanism similar to shp2pgsql'''
- * raster2pgsql and pgsql2raster utilities allowing import/export of a single raster or a batch of raster into a tiled coverage. 
+ * raster2pgsql allows import of a single raster or a batch of raster into a table representing a tiled coverage.
+ * a future pgsql2raster should allow export of raster to filesystem rasters.
+ * a read GDAL driver allow export of rasters from the DB to the filesystem.
 
 '''...allows easy conversion from/to geometry/raster...'''
- * ST_DumpToPolygons(raster) -> geometry set
- * ST_AsRaster(geometry, pixelsize) -> raster 
+ * ST_DumpAsPolygons(raster) -> geometry-value set
+ * ST_AsRaster(geometry, pixelsize) -> raster
 
 '''...implements base GIS raster operations available in most GIS...'''
  * ST_Resample(raster, pixelsize, method) -> raster
- * ST_Clip(raster|geometry,geometry) -> same type as first argument
- * ST_Reclass(raster|geometry,string) -> same type as first argument
- * ST_MapAlgebra(raster|geometry, raster), mathematical expression, "raster"|"geometry") -> raster/geometry
+ * ST_Clip(raster, geometry) -> raster
+ * ST_Reclass(raster, string) -> raster
+ * ST_MapAlgebra(raster, raster, mathematical expression) -> raster
  * etc...) 
 
-'''...introduces raster/geometry seamless geometry constructors...'''
+'''...introduces raster/geometry seamless spatial operation...'''
  * so you don't have to bother whether the layers are in raster or vector form when using analysis functions.
- * ST_Intersection(raster|geometry, raster|geometry, "raster"|"geometry") -> raster/geometry
- * ST_Union(raster|geometry, raster|geometry, "raster"|"geometry") -> raster/geometry
- * ST_Accum(raster set|geometry set, "raster"|"geometry") -> raster/geometry
- * ST_Transform(raster|geometry, SRID) -> same type as input
+ * ST_Intersection(raster|geometry, raster|geometry) -> raster/geometry-value set
+ * ST_Union(raster, raster) -> raster
+ * ST_Transform(raster, SRID) -> raster
  * etc...