Detector Attributes
Extract or replace attributes of an object of class ‘traps’.
polyID(object) polyID(object) <- value transectID(object) transectID(object) <- value searcharea(object) transectlength(object)
object |
a ‘traps’ object |
value |
replacement value (see Details) |
The ‘polyID’ and ‘transectID’ functions assign and extract the attribute of a ‘traps’ object that relates vertices (rows) to particular polygons or transects. The replacement value should be a factor of length equal to nrow(object).
The ‘searcharea’ of a ‘polygon’ traps object is a vector of the areas of the component polygons in hectares. This value is read-only.
The ‘transectlength’ of a ‘transect’ traps object is a vector of the lengths of the component transects in metres. This value is read-only.
polyID - a factor with one level per polygon.
searcharea - numeric value of polygon areas, in hectares.
transectlength - numeric value of transect lengths, in metres.
## default is a single polygon temp <- make.grid(detector = "polygon", hollow = TRUE) polyID(temp) plot(temp) ## split in two temp <- make.grid(detector = "polygon", hollow = TRUE) polyID(temp) <- factor(rep(c(1,2),rep(10,2))) plot(temp)
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