# nearest.raster.point

##### Find Pixel Nearest to a Given Point

Given cartesian coordinates, find the nearest pixel.

##### Usage

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

##### Arguments

- 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.

##### Details

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.

##### Value

- 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.

##### See Also

##### Examples

```
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)
```

*Documentation reproduced from package spatstat, version 1.42-2, License: GPL (>= 2)*