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 >
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