| xyFromCell {raster} | R Documentation |
These functions get coordinates of the center of raster cells for a row, column, or cell number of a Raster* object.
xFromCol(object, col=1:ncol(object)) yFromRow(object, row=1:nrow(object)) xyFromCell(object, cell, spatial=FALSE) xFromCell(object, cell) yFromCell(object, cell)
object |
Raster* object (or a SpatialPixels* or SpatialGrid* object) |
cell |
cell number(s) |
col |
column number; or vector of column numbers |
row |
row number; or vector of row numbers |
spatial |
return a SpatialPoints object (sp package) instead of a matrix |
Cell numbers start at 1 in the upper left corner, and increase from left to right, and then from top to bottom. The last cell number equals the number of cells of the Raster* object.
xFromCol, yFromCol, xFromCell, yFromCell: vector of x or y coordinates
xyFromCell: matrix(x,y) with coordinate pairs
#using a new default raster (1 degree global)
r <- raster()
xFromCol(r, c(1, 120, 180))
yFromRow(r, 90)
xyFromCell(r, 10000)
xyFromCell(r, c(0, 1, 32581, ncell(r), ncell(r)+1))
#using a file from disk
r <- raster(system.file("external/test.grd", package="raster"))
r
cellFromXY(r, c(180000, 330000))
#xy for corners of a raster:
xyFromCell(r, c(1, ncol(r), ncell(r)-ncol(r)+1, ncell(r)))