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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