A good approach might be to split your data into two ppps, one 'north' and
one 'south', according to your study site delimiters, then just rthin by
the ratio of intensity:

## Produce a new, "thinned" version of the south points:
north.intens <- summary(north)$intensity
south.intens <- summary(south)$intensity
south.thin <- rthin(south, north.intens/south.intens)

Allen Aven, Ph.D. *Candidate*
Dauphin Island Sea Lab
101 Bienville Blvd.
Dauphin Island, AL  36528
251-861-2141 x7547
allenaven@gmail.com - http://merl.disl.org/

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