distance | R Documentation |
For a single RasterLayer
(y
is missing) this method computes the distance, for all cells that are NA
, to the nearest cell that is not NA
.
The distance unit is in meters if the RasterLayer is not projected (+proj=longlat
) and in map units (typically also meters) when it is projected.
If two RasterLayer
objects are provided, the cell-value distances are computed.
If two Spatial
vector type objects are provided, the distances between pairs of geographic object are computed.
## S4 method for signature 'RasterLayer,missing'
distance(x, y, filename='', doEdge=TRUE, ...)
## S4 method for signature 'RasterLayer,RasterLayer'
distance(x, y, ...)
## S4 method for signature 'Spatial,Spatial'
distance(x, y, ...)
x |
RasterLayer object |
y |
missing, RasterLayer or Spatial object |
filename |
Character. Filename for the output RasterLayer (optional) |
doEdge |
Logical. If |
... |
Additional arguments as for |
RasterLayer
distanceFromPoints
, gridDistance
, pointDistance
See the gdistance
package for more advanced distances, and the geosphere
package for great-circle distances (and more) between points in longitude/latitude coordinates.
r <- raster(ncol=36,nrow=18)
values(r) <- NA
r[500] <- 1
dist <- distance(r)
#plot(dist / 1000)
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