Dear All,

I am new to spatial analysis in R, and I wanted to know if anyone could help
me.  I am interested in finding the area of overlap between the ranges of 2
species.  I have downloaded herbarium record data for a genus of plants that
includes species names and the lat/long coordinates of the record.  I would
like to be able to compute:
the minimum convex polygon for each species (I have been able to do this
with earth.poly{fossil}),
the area of that polygon (also obtainable through earth.poly{fossil}),
and the centroid coordinate of the polygon.

I would then like to take these polygons and determine the pairwise area of
overlap between all species combination and the distance between centroids.
I have not been able to find a function that will help me do this.  Is there
a function for this type of analysis and what class of data do I need to
make this work.  Thank you in advance for any assistance.

Sincerely,
Ryan

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