Dear list,
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
owin(x=range(westcoords$X), y=range(westcoords$Y),
poly=list(x=westcoords$X, y=westcoords$Y))
where westcoords are the coordinated of the polygon
I get:
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
Thanks,
Corey
Corey Sparks
Assistant Professor
Department of Demography and Organization Studies
University of Texas at San Antonio
One UTSA Circle
San Antonio, TX 78249
210 458 6858
[email protected]
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