Given cartesian coordinates, find the nearest pixel.

`nearest.raster.point(x,y,w, indices=TRUE)`

x

Numeric vector of \(x\) coordinates of any points

y

Numeric vector of \(y\) coordinates of any points

w

An image (object of class `"im"`

)
or a binary mask window (an object of class `"owin"`

of type `"mask"`

).

indices

Logical flag indicating whether to return the row and column indices, or the actual \(x,y\) coordinates.

If `indices=TRUE`

, a
list containing two vectors `rr`

and `cc`

giving row and column positions (in the image matrix).
If `indices=FALSE`

, a list containing
vectors `x`

and `y`

giving actual coordinates
of the pixels.

The argument `w`

should be either a pixel image
(object of class `"im"`

) or a window (an object of class
`"owin"`

, see `owin.object`

for details)
of type `"mask"`

.

The arguments `x`

and `y`

should be numeric vectors
of equal length. They are interpreted as the coordinates of
points in space. For each point `(x[i], y[i])`

, the function
finds the nearest pixel in the grid of pixels for `w`

.

If `indices=TRUE`

,
this function returns a list containing two vectors `rr`

and
`cc`

giving row and column positions (in the image matrix).
For the location `(x[i],y[i])`

the nearest
pixel is at row `rr[i]`

and column `cc[i]`

of
the image.

If `indices=FALSE`

, the function returns a list containing
two vectors `x`

and `y`

giving the actual coordinates
of the pixels.

# NOT RUN { w <- owin(c(0,1), c(0,1), mask=matrix(TRUE, 100,100)) # 100 x 100 grid nearest.raster.point(0.5, 0.3, w) nearest.raster.point(0.5, 0.3, w, indices=FALSE) # }