Detector Attributes

Description

Extract or replace attributes of an object of class ‘traps’.

Usage

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polyID(object)
polyID(object) <- value
transectID(object)
transectID(object) <- value
searcharea(object)
transectlength(object)

Arguments

object

a ‘traps’ object

value

replacement value (see Details)

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.

Value

polyID - a factor with one level per polygon. searcharea - numeric value of polygon areas, in hectares. transectlength - numeric value of transect lengths, in metres.

See Also

traps

Examples

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## 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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