deleteMaskPoints {secr}

Edit Mask Points

Description

Mask points may be removed by one of three methods: clicking on points, clicking on vertices to define a polygon from which points will be removed, or specifying a polygon to which the mask will be clipped.

Usage

deleteMaskPoints(mask, onebyone = TRUE, add = FALSE, poly = NULL,
 poly.habitat = FALSE, ...)

Arguments

mask

secr mask object

onebyone

logical; see Details

add

logical; if true then the initial mask plot will be added to an existing plot

poly

polygon defining habitat or non-habitat as described in make.mask

poly.habitat

logical; if TRUE polygon represents habitat

...

other arguments to plot.mask

Details

The default method (onebyone = TRUE, poly = NULL) is to click on each point to be removed. The nearest mask point will be selected.

Setting onebyone = FALSE allows the user to click on the vertices of a polygon within which all points are to be removed (the default) or retained (poly.habitat = TRUE). Vertices need not coincide with mask points.

Defining poly here is equivalent to calling make.mask with poly defined. poly one of the several types described in boundarytoSF. Whether poly represents habitat or non-habitat is toggled with poly.habitat – the default here differs from make.mask.

Value

A mask object, usually with fewer points than the input mask.

See Also

make.mask, subset.mask

Examples

if (interactive()) {
    mask0 <- make.mask (traps(captdata))
    ## Method 1 - click on each point to remove
    mask1 <- deleteMaskPoints (mask0)
    ## Method 2 - click on vertices of removal polygon
    mask2 <- deleteMaskPoints (mask0, onebyone = FALSE)
    ## Method 3 - predefined removal polygon
    plot(captdata)
    poly1 <- locator(5)
    mask3 <- deleteMaskPoints (mask0, poly = poly1)
}