Convert a mask or Dsurface with an irregular outline into a mask or Dsurface with a rectangular outline and the same bounding box. This enables contour plotting.
rectangularMask(mask)
A rectangular mask or Dsurface with the same `area', `boundingbox',
`meanSD', `polygon' and `polygon.habitat' attributes as mask. A
logical vector attribute `OK' is added identifying the points
inherited from mask.
object of class mask or Dsurface
The covariates of new points are set to missing. The operation may be
reversed (nearly) with subset(rectmask, attr(rectmask, "OK")).
The results are unpredictable if the mask has been rotated.
plot.Dsurface
rMask <- rectangularMask(possummask)
plot(rMask)
plot(possummask, add = TRUE, col = "blue")
Run the code above in your browser using DataLab