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

[Michael Sumner]

Thanks Roger.

Roger Bivand wrote:
> 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
>