weeds.lines: Transect lines from Dubbo weed data

Description

Lines sampled in a farming paddock with eight 150m wide transects (75m each side)

Usage

data(weeds.lines)

Arguments

docType

data

Details

These are lines constructed for the weeds data that were provided by Melville and Welsh (see reference below) that were used in the Biometrics paper on distance sampling. The code used to create the lines was as follows: weeds.lines=data.frame(label=1:8,x0=75+0:7*150,x1=75+0:7*150, y0=rep(0,8),y1=rep(1200,8),width=rep(149.9999,8)) The line widths were reduced by 0.0001 so the transects do no abut because spatstat treats them as overlapping polygons.

References

Melville, G. J., and A. H. Welsh. 2001. Line transect sampling in small regions. Biometrics 57:1130-1137.