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GPS for Documenting recording data - RFI

Subject: GPS for Documenting recording data - RFI
From: Wild Sanctuary <>
Date: Tue, 13 Aug 2002 06:49:35 -0700
Yet another problem: On a recent soundscape data gathering project 
for the National Park Service, we took GPS readings at each site we 
recorded with two seperate units. We could never get them to provide 
exactly the same reading given the built in distortion for most 
commonly available units. Sometimes they deviated by as much as 100 
meters or more and altitude measurements were off by hundreds of 
feet. As a matter of fact, each time we took readings, the same 
device would give a different outputs. Since we knew the altitude and 
precise coordinates (because the sites had been previously mapped) we 
were able to note the metadata with some accuracy.

Unless one is using something like a calibrated Trimble (about 
$15,000USD), accurate GPS readings, forest or no, will be unlikely 
until the distortion chips are removed.

Bernie Krause

>On the subject of documenting recording data, Walter has written:
>
>>
>>  Most critical is location and time. Use a GPS to get exact location, ...
>>
>
>Anyone know of a GPS instrument that can be used successfully in dense
>rainforest (closed canopy), 60 or 70 metres high?  I'd sure like to buy one,
>if it exists.
>
>TIA
>
>Syd Curtis in Brisbane, Australia.
>
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-- 

Wild Sanctuary, Inc.
P. O. Box 536
Glen Ellen, California  95442-0536
Tel: (707) 996-6677
Fax: (707) 996-0280
http://www.wildsanctuary.com


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