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terra (version 1.7-55)

xyRowColCell: 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 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)

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

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).

See Also

crds

Examples

Run this code
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)

# if no row/col specified all are returned
range(xFromCol(r))
length(yFromRow(r))

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