Interpolating a raster layer from a point layer...

[Frank Warmerdam]

On Apr 6, 2005 5:07 PM, Jeremy Malczyk <jmalczyk at yahoo.com> wrote:
> Apologies, Yahoo Mail spell check somehow managed to garble my post.
>
> Again:
>
>  Is it possible for MapServer to render a raster layer that is derived entirely from values in a
>  vector (in this case, point) datasource.
>
>  For example, I have regularly spaced point data (a grid of sorts), and I want MapServer to color
>  pixels based on the nearest point in that layer (instead of just displaying the point itself as
>  a symbol). The points would be coming in via an OGRVRTDataSource pulling from an ODBC Connection
>  to an MS-SQL database. So basically I need Mapserver to query the point layer for each pixel in
>  the raster being generated, determine the nearest point, and then classify it according to an
>  attribute of that point.
>
>  Make sense? If so, can this be done? The point data would be changing rather frequently (daily)
>  so precompiling the raster in a regular GIS would be impractical.

Jeremy,

There is no support in MapServer (or GDAL/OGR) for on-the-fly
interpolation of a grid from point data.

Best regards,
--
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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