Coordinates from a row, column or cell number

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Description

These functions get coordinates of the center of raster cells for a row, column, or cell number of a Raster* object.

Usage

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xFromCol(object, col=1:ncol(object))
yFromRow(object, row=1:nrow(object))
xyFromCell(object, cell, spatial=FALSE)
xFromCell(object, cell)
yFromCell(object, cell)

Arguments

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

Details

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.

Value

xFromCol, yFromCol, xFromCell, yFromCell: vector of x or y coordinates

xyFromCell: matrix(x,y) with coordinate pairs

See Also

cellFromXY

Examples

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#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)))

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