[R-sig-Geo] SpatialPixels - other implementations?

[Roger Bivand]

On Tue, 5 Jun 2007, Michael Sumner wrote:

> Hello,
> 
> I'm interested in the origin of the idea behind sp's SpatialPixels.
> What other software/s implement this concept, of storing a sparse grid 
> of pixels?

Directly from the Cells object in Terralib:

http://www.terralib.org/docs/v313/datamodel/SpatialModel.pdf

(they had lots of images with clouds, that is NA, and found the direct 
database record a better representation than repeated lookups on raster 
cells with content).

Roger

> 
> I'm aware of the SparseMatrix in R, and I haven't explored that thread - 
> are there specifically GIS implementations of this idea?
> 
> Cheers, Mike.
> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no