On Wed, Dec 31, 2014 at 9:51 AM, Andy Turner <a.g.d.tur...@leeds.ac.uk>
wrote:
> Hi geotools-users,
>
> I want a method to convert data from a polygon type coverage (data
> currently stored in shapefile) to a square celled raster.
>
> I want something a bit more sophisticated than assigning the value at the
> raster cell centroid: The method is to do a form of areal interpolation,
> taking areal proportions for each target raster cell summed for all
> contributing. source polygons.
>
> Previously I have done this type of work using ESRI technology by
> generating a fishnet polygon coverage, intersecting coverages, calculating
> statistics and finally doing a polygon coverage to raster conversion.
>
Nope, we don't have such method, what we have is a fast vector to raster
based on java2d painting plus some tricks
to retain the actual values (based on color-value associations, given that
colors can represent 32bit worth of values).
The vector based approach can become quite costly due to the high number of
intersections, I would also consider
rasterizing at a higher resolution and then do pixel counts as an
alternative.
Cheers
Andrea
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