Changes between Version 35 and Version 36 of WKTRaster/SpecificationWorking03

Timestamp:

03/14/11 11:15:55 (14 years ago)

Author:

pracine

Comment:

—

WKTRaster/SpecificationWorking03

@@ -207 +207 @@
 So this would mean "for each pixel, compute the average of all the 1 + 8 + 16 = 25 pixels surrounding the current pixel and "ignore" pixels with nodata values."
 
-The "ST_Avg" summarizing function should accept three parameters: an array of float8 values, a X and a Y dimension, and optionnally a "what to do with nodata values". The possible value for this parameter could be:
+The "ST_Avg" summarizing function should accept three parameters: an array of float8 values, a X and a Y dimension, and optionnally a "what to do with nodata values". The possible value for this last parameter could be:
 
  *"NULL": If any value is a nodata value, return NULL.
+
  *"ignore": Ignore any nodata value so that if 4 pixels on 25 are nodata values, do the computation with the 21 remaining.
+
  *a value: Replace any nodata value with this value and compute.