[R-sig-Geo] Best way to get values of a raster that are not masked?

[Robert J. Hijmans]

Hi Jonathan,

The function rasterToPoints does that. Its default behavior is to
returns a matrix with coordinates and values for all cells that are
not NA.
You can also ask for cells with a specific range of values, and for a
SptialPointDataFrame.

Robert


On Wed, Jun 2, 2010 at 5:27 PM, Jonathan Greenberg
<greenberg at ucdavis.edu> wrote:
> I've got a file and a mask (1s for "good data", NAs for "bad"), and I
> want to extract the cell values AND geographic coordinates of these
> cells into a data frame or vector that correspond to the locations
> where the mask is 1 -- what is the best practice for doing this?  I
> can loop through each row/block and do the query, but is there a
> "cleaner" way of approaching this in raster()?
>
> --j
>
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