distancetotrap {secr} | R Documentation |
Distance To Nearest Detector
Description
Compute Euclidean distance from each of a set of points to the nearest detector in an array, or return the sequence number of the detector nearest each point.
Usage
distancetotrap(X, traps)
nearesttrap(X, traps)
Arguments
X |
coordinates |
traps |
traps object or 2-column matrix of coordinates |
Details
distancetotrap
returns the distance from each point in X to the
nearest detector in traps
. It may be used to restrict the points
on a habitat mask.
For traps objects with polygon detector type (polygon, polygonX), and for SpatialPolygons, the function sf::st_distance is used internally(from secr 4.5.2).
Value
distancetotrap
returns a vector of distances (assumed to be in metres).
nearesttrap
returns the index of the nearest trap.
See Also
Examples
## restrict a habitat mask to points within 70 m of traps
## this is nearly equivalent to using make.mask with the
## `trapbuffer' option
temptrap <- make.grid()
tempmask <- make.mask(temptrap)
d <- distancetotrap(tempmask, temptrap)
tempmask <- subset(tempmask, d < 70)
[Package secr version 4.6.9 Index]