Changes between Version 41 and Version 42 of WKTRaster/SpecificationWorking02

Timestamp:

Sep 21, 2010, 8:47:57 AM (14 years ago)

Author:

pracine

Comment:

—

WKTRaster/SpecificationWorking02

@@ -85 +85 @@
 == '''Objective 2.0.03 - Being able to create a raster as the expression of two rasters''' ==
 
+'''ST_SameAlignment(raster, raster)'''
+
+ TBD
+
 '''ST_MapAlgebra'''
+
+ TBD
 
 ----
@@ -177 +183 @@
 == '''Objective 2.0.06 - Being able to add a band to a raster as a copy of the band of another raster.''' ==
 
-'''ST_AddBand(rast1 raster, rast2 raster, band int, index int)'''
-
- Copy band of rast2 into rast1 at the specified index.
+'''ST_AddBand'''
+
+ Copy rast2 band into rast1 at the specified index.
 
  This function is useful in a number of plpgsql functions and to optimize ST_MapAlgebra.
 
- 
+ '''Variants'''
+
+  1) ST_AddBand(rast1 raster, rast2 raster, band int, index int)
+
+  2) ST_AddBand(rast1 raster, rast2 raster, band int)
+
+  3) ST_AddBand(rast1 raster, rast2 raster)
+
+ Variant 2 add the rast2 band as the last band of rast1.
+
+ Variant 3 default band to 1 and add it as the last band of rast1.
+
+ '''Implementation details'''
+
+ Only variant 1 should be implemented as a C functions. Others variants are plpgsql variants.