read_pppdata {highriskzone}

Read data, so it can be used for high-risk zone methodology.

Description

If xwin or ywin is NULL, the observation window will be a rectangular bounding box. Vertices must be listed anticlockwise; no vertex should be repeated. Only needed for data that is not already of class ppp.

Usage

read_pppdata(xppp, yppp, xwin = NULL, ywin = NULL, unitname = NULL)

Arguments

xppp

Vector of x coordinates of data points

yppp

Vector of y coordinates of data points

xwin

Vector of x coordinates of the vertices of a polygon circumscribing the observation window

ywin

Vector of y coordinates of the vertices of a polygon circumscribing the observation window

unitname

Optional. Name of unit of length. Either a single character string, or a vector of two character strings giving the singular and plural forms, respectively.

Value

An object of class "ppp" describing a point pattern in the two-dimensional plane.

See Also

ppp, bounding.box.xy, owin

Examples

data(craterA)
windowA <- data.frame(x = craterA$window$bdry[[1]]$x, y = craterA$window$bdry[[1]]$y)
patternA <- data.frame(x = craterA$x, y = craterA$y)
str(patternA)
str(windowA)
crater <- read_pppdata(xppp = patternA$x, yppp = patternA$y, 
                       xwin = windowA$x, ywin = windowA$y)
crater