[postgis-users] Question About ST_Value

Pierre Racine Pierre.Racine at sbf.ulaval.ca
Wed Oct 19 12:25:38 PDT 2011


As I mentioned in a previous post:

Points outside the area covered by the raster are assigned NULL. There is no extrapolation done.

Points inside the area covered by the raster are assigned the value of the pixel they fall on. There is no interpolation done.


> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-
> bounces at postgis.refractions.net] On Behalf Of elliott
> Sent: Wednesday, October 19, 2011 3:05 PM
> To: PostGIS Users Discussion
> Subject: [postgis-users] Question About ST_Value
> How does ST_Value determine the value at a given geometry point that does not
> correspond to the intersection of a row and column?  Is it doing some kind of
> interpolation or nearest neighbor search to determine the value?
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