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

    ## S4 method for signature 'Raster,numeric'
    xFromCol(object, col)
    ## S4 method for signature 'Raster,numeric'
    yFromRow(object, row)
    ## S4 method for signature 'Raster,numeric'
    xFromCell(object, cell)
    ## S4 method for signature 'Raster,numeric'
    yFromCell(object, cell)
    ## S4 method for signature 'BasicRaster,ANY'
    xyFromCell(object, cell, spatial=FALSE, ...)
    ## S4 method for signature 'Raster'
    coordinates(obj, ...)
    ## S4 method for signature 'Extent'
    coordinates(obj, ...)

### Arguments

`object` | Raster* object (or a SpatialPixels* or SpatialGrid* object)
`col` | column number; or vector of column numbers. If missing, the x coordinates for all columns are returned
`row` | row number; or vector of row numbers. If missing, the y coordinates for all rows are returned
`cell` | cell number(s)
`spatial` | If `spatial=TRUE`, `xyFromCell` returns a SpatialPoints object instead of a matrix
`...` | additional arguments. None implemented
`obj` | Raster object

### 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

coordinates: xy coordinates for all cells

### 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 3.4-13 Index]