[Qgis-user] shape file to gridded

[pcreso at pcreso.com]

Hi Marc

I don't think QGIS can do this natively, although via the Grass plugin, you may be able to, as Grass can do this sort of thing.

I think your best option is to use GMT & GDAL/OGR.

OGR can be used to export the shapefile into a variety of formats, including GMT. My preference is to use PostGIS for this sort of thing, as you have more flexibility, & generating a GMT point file is a simple SQL. Loading a shapefile into PostGIS can be done with ogr2ogr or with the shp2pgsql utility that comes with PostGIS. 

GMT can grid point data using a variety of algorithms & paramaters, & the native grid file format is netCDF, althiugh an export to ascii is easy enough as well.

http://gmt.soest.hawaii.edu
http://www gdal.org (go to the OGR page, & see the ogr2ogr utility)
http://www.postgis.org


Cheers,

 Brent Wood

--- On Sun, 3/15/09, Marc Fischer <MLFischer at lbl.gov> wrote:

> From: Marc Fischer <MLFischer at lbl.gov>
> Subject: [Qgis-user] shape file to gridded
> To: qgis-user at lists.osgeo.org
> Date: Sunday, March 15, 2009, 7:00 PM
> Folks,
> 
> I have polygons in a shape file with an attribute that
> I'd like to distribute on a geographic grid and then
> export to netcdf or ascii.  I've done this in Arcview
> using Spatial Analyst Extension.
> 
> Is there a way to do this in QGIS?
> 
> Best,
> 
> Marc
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