Spatial Join of Points with Raster Grids
extract.data extracts data from raster object of
class 'asc' (this and the adehabitat package),
'RasterLayer' (raster package) or 'SpatialGridDataFrame'
(sp package) at specified locations. This represents a
faster version of 'join.asc' of the adehabitat package that
assumes all locations are within the map extents.
Note: there is no interpolation done here. The values reported are simply the values of the raster cell the point falls into.
## S3 method for class 'data' extract(pts, x)
a two-column data frame or matrix with the x and y coordinates of the locations of interest.
a raster matrix of class 'asc' (this and the adehabitat package), 'RasterLayer' (raster package) or 'SpatialGridDataFrame' (sp package)
Implements a faster version of 'join.asc' from the
NOTE: this assumes all locations are within the extent of the raster map. Values outside the extent will be given a value of NA.
Returns a vector equal in length to the number of locations in pnts.
Jeremy VanDerWal firstname.lastname@example.org
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