neighbour patches

Hi,

I am tempted to dig in graph theory and analyse connections between discrete 
landscape patches. Re-reading 'Applied Spatial Data Analysis with R' I was 
happy to find basics chapter 9. However, it reports on graphs where 
(euclidian) distance is computed between patch centroids.

Does anybody have an idea about strategies or packages permitting to use the 
shortest distance between patch borders instead (which is more realistic with 
regard to animal movement) ?

If the patches are Polygons objects in a SpatialPolygons object, the 
gDistance() function in rgeos on R-Forge does this for planar coordinates, 
for example:

gDistance(SP, SP, byid=TRUE)

returns a square distance matrix.

Roger
Patrick

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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no

neighbour patches

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