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

Get coordinates of the center of raster cells for a row, column, or cell number of a SpatRaster. 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. row numbers start at 1 at the top, column numbers start at 1 at the left.

Usage

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

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

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

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

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

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

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

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

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

# S4 method for SpatRaster,numeric,numeric
rowColCombine(object, row, col)

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

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

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

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

Arguments

object

SpatRaster

cell

integer. cell number(s)

col

integer. column number(s) or missing (equivalent to all columns)

row

integer. row number(s) or missing (equivalent to all rows)

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, rowColCombine: matrix of row and column numbers

See also

crds

Examples

r <- rast()

xFromCol(r, c(1, 120, 180))
#> [1] -179.5  -60.5   -0.5
yFromRow(r, 90)
#> [1] 0.5
xyFromCell(r, 10000)
#>         x    y
#> [1,] 99.5 62.5
xyFromCell(r, c(0, 1, 32581, ncell(r), ncell(r)+1))
#>           x     y
#> [1,]    NaN   NaN
#> [2,] -179.5  89.5
#> [3,]    0.5  -0.5
#> [4,]  179.5 -89.5
#> [5,]    NaN   NaN

cellFromRowCol(r, 5, 5)
#> [1] 1445
cellFromRowCol(r, 1:2, 1:2)
#> [1]   1 362
cellFromRowCol(r, 1, 1:3)
#> [1] 1 2 3

# all combinations
cellFromRowColCombine(r, 1:2, 1:2)
#> [1]   1   2 361 362

colFromX(r, 10)
#> [1] 191
rowFromY(r, 10)
#> [1] 81
xy <- cbind(lon=c(10,5), lat=c(15, 88))
cellFromXY(r, xy)
#> [1] 27191   906

# if no row/col specified all are returned
range(xFromCol(r))
#> [1] -179.5  179.5
length(yFromRow(r))
#> [1] 180