Opened 10 years ago
Last modified 5 years ago
#2805 new defect
[raster] Expected return from ST_MapAlgebra callback function is not documented
| Reported by: | strk | Owned by: | robe |
|---|---|---|---|
| Priority: | medium | Milestone: | PostGIS Fund Me |
| Component: | documentation | Version: | master |
| Keywords: | Cc: | dustymugs., robe |
Description
The documentation for ST_MapAlgebra does not say what is the semantic of the value returned by the user callback function. In particular, it doesn't mention you can return NULL to mean "nodata" (or can you ?)
Change History (3)
comment:1 by , 10 years ago
| Cc: | added |
|---|
comment:3 by , 5 years ago
| Milestone: | → PostGIS Fund Me |
|---|
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I'm unexpectedly getting a NODATA value of 0 in output from ST_MapAlgebra when the input has no NODATA flag set. This is one of the reasons why I was looking for documentation about return values...