R: Coordinates from a row, column or cell number

xyFromCell {raster} | R Documentation

## Coordinates from a row, column or cell number

### Description

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

### Usage

    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

    #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)))

[Package raster version 2.6-7 Index]