nearest.raster.point {spatstat} | R Documentation |
Given cartesian coordinates, find the nearest pixel.
nearest.raster.point(x,y,w)
x |
Numeric vector of x coordinates of any points |
y |
Numeric vector of y coordinates of any points |
w |
A window (an object of class "owin" )
of type "mask" representing a binary pixel image.
|
The argument w
should be a window (an object of class
"owin"
, see owin.object
for details).
A window of type "mask"
represents a binary pixel image.
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.
List containing two vectors rr
and cc
giving row and column positions (in the image matrix).
Adrian Baddeley adrian@maths.uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner rolf@math.unb.ca http://www.math.unb.ca/~rolf
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)