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Professor Huth,

From the discussion so far, I gather that the student has access to a
computer.  If he can get a digital version of a topographical map of
the study region, he might consider a program such as OziExplorer. It
will display his digital map and allow him to plot points on the map.
If he can determine the exact position of the tree, usually done with
a GPS receiver, he could plot the position of the lizard perches
easily. If this sort of solution is of interest have a look at :

www.oziexplorer.com

This is a fairly inexpensive program (< 100USD) that has been around
for many years and is under active development. I have used it for
approximately 4 years and am pleased with it.

Vic Fraenckel

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