Creating IDW grids of point data for Mapserver {Scanned} {Scanned}

[Siki Zoltan]

Hi,

You should check GMT (General Mapping Tool) or GRASS.
Both are open source and you can write scripts to automate tasks.

Bye
Zoltan

On Thu, 25 Nov 2004, Cord Thomas wrote:

> Hello,
>
> Has anyone experience creating inverse distance weighted (IDW) graphs for
> use with mapserver?
>
> I am working in Linux.  I have data collected in PostGIS, some street
> centerlines, and would like to calculate IDW raster grids to present in
> transparent mode over the street data.
>
> There are two approaches i could use -
> 1 - calculate the IDW grids as a scheduled process - what tools are there
> available to do this?
> 2 - calculate the IDW grids live given user parameters - though i could
> imagine this would be very expensive.
>
> Anyone have suggestions on how to do this?  What tools i might have to do
> this?
>
> I see GRASS has some surface calculation methods - I know nothing about
> GRASS - can one automate calls to it?
>
> I am interested in open source means only.
>
> Thank you
>