[R-sig-Geo] Help with anti-clockwise polygon in owin
COREY.SPARKS at UTSA.EDU
Thu Jan 8 20:04:31 CET 2009
I have a point pattern that consists of wells on an island. I am
interested doing some exploratory point pattern analysis on this data
(such as Gest in spatstat). The island as you can imagine is an
irregular polygon defined by 1815 points. When I try to create the
observation window for the point pattern in spatstat using
where westcoords are the coordinated of the polygon
Error in owin(x = range(westcoords$X), y = range(westcoords$Y), poly =
list(x = westcoords$X, :
Area of polygon is negative - maybe traversed in wrong direction?
Since the origin of the coordinates is a shapefile I created myself,
how can I get around this "traversed in the wrong direction" problem?
I can make the data this is based on available if anyone would need it.
I'm using R 2.8.1 on a Mac with Leopard OS
Department of Demography and Organization Studies
University of Texas at San Antonio
One UTSA Circle
San Antonio, TX 78249
210 458 6858
corey.sparks at utsa.edu
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