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I am preparing a correlation matrix for 7 raster layers. The
results using the r.covar
module are different from the R layerStats
function. I suspect this is due to handling of null cells. The R
function has a parameter to remove NA cells, but the GRASS module,
I think, just loops over all cells, including no value.
Can anyone confirm that GRASS does not deal with null cells, and that this would cause the difference in correlation results?
Thanks -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab cell: +972-523-665918 |
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