R: Coordinates from a row, column or cell number and vice versa

xyRowColCell {terra} | R Documentation

## Coordinates from a row, column or cell number and vice versa

### Description

Get coordinates of the center of raster cells for a row, column, or cell number of a SpatRaster object. Or get row, column, or cell numbers from coordinates or from each other.

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 SpatRaster object. row numbers start at 1 at the top, column numbers start at 1 at the left.

### Usage

    ## S4 method for signature 'SpatRaster,numeric'
    xFromCol(object, col)

    ## S4 method for signature 'SpatRaster,numeric'
    yFromRow(object, row)

    ## S4 method for signature 'SpatRaster,numeric'
    xyFromCell(object, cell)

    ## S4 method for signature 'SpatRaster,numeric'
    xFromCell(object, cell)

    ## S4 method for signature 'SpatRaster,numeric'
    yFromCell(object, cell)

    ## S4 method for signature 'SpatRaster,numeric'
    colFromX(object, x)

    ## S4 method for signature 'SpatRaster,numeric'
    rowFromY(object, y)

    ## S4 method for signature 'SpatRaster,numeric,numeric'
    cellFromRowCol(object, row, col)

    ## S4 method for signature 'SpatRaster,numeric,numeric'
    cellFromRowColCombine(object, row, col)

    ## S4 method for signature 'SpatRaster,numeric'
    rowFromCell(object, cell)

    ## S4 method for signature 'SpatRaster,numeric'
    colFromCell(object, cell)

    ## S4 method for signature 'SpatRaster,numeric'
    rowColFromCell(object, cell)

    ## S4 method for signature 'SpatRaster,matrix'
    cellFromXY(object, xy)

### Arguments

`object` | SpatRaster
`cell` | integer. cell number(s)
`col` | integer. column number(s)
`row` | integer row number(s)
`x` | x coordinate(s)
`y` | y coordinate(s)
`xy` | matrix of x and y coordinates

### 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 SpatRaster (see `ncell`).

### Value

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

xyFromCell: matrix(x,y) with coordinate pairs

colFromX, rowFromY, cellFromXY, cellFromRowCol, rowFromCell, colFromCell: vector of row, column, or cell numbers

rowColFromCell: matrix of row and column numbers

### See Also

`crds`

### Examples

    r <- rast()

    xFromCol(r, c(1, 120, 180))
    yFromRow(r, 90)
    xyFromCell(r, 10000)
    xyFromCell(r, c(0, 1, 32581, ncell(r), ncell(r)+1))

    cellFromRowCol(r, 5, 5)
    cellFromRowCol(r, 1:2, 1:2)
    cellFromRowCol(r, 1, 1:3)

    # all combinations
    cellFromRowColCombine(r, 1:2, 1:2)

    colFromX(r, 10)
    rowFromY(r, 10)
    xy <- cbind(lon=c(10,5), lat=c(15, 88))
    cellFromXY(r, xy)

[Package terra version 1.4-7 Index]