[R-sig-Geo] Distance from point to specified raster cell value

Alexandre Lafontaine a_lafontaine at hotmail.com
Mon Jul 6 19:38:44 CEST 2015

Dear members,
I am looking for a way to extract the distance from spatial points objects to the closest raster cell of a specific value. I have not a found a way to do so yet with the raster or rgeos librairies...

Something like the gDistance function in which I could specify the raster value I am interested in:

         gDistance( spatialpoints, r[r==15])

If anyone have suggestions, (it needs to be fairly quick because I have thousands of points to compute).

Any help really appreciated,

Alex Lafontaine

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