[postgis-users] WKTraster pixel value

[Pierre Racine]

Rainer,

There is a difference between accessing a whole band of a multiband raster and access a single pixel value.

The ST_Band(rast raster, band integer) function (not yet implemented) will return a whole band (i.e. an object of type raster).

The ST_Value(rast raster, band integer, x integer, y integer) function (implemented but not yet documented) returns the value of a single pixel expressed as a float point value.

Pierre

From: postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Rainer Zaiss
Sent: 9 février 2010 04:10
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] WKTraster pixel value

Dear list,

I just played around with WKTraster. I just want to have a confirmation that the function to access the pixel values is not yet implied (ST_Band(raster, band)) ?

Thank you very much for your help

Rainer


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