Toolik Field Station - IAB - UAF

GPS BASE STATION README - 2003

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BASE COORDINATE

WGS84, HAE
68.62753149N, 149.5977264W, 731.947m

The base coordinate is derived from an average of six days of continuous data in early June 2001.

8 base files were also processed against a temporary survey grade base in 2002.  The dual frequency
survey data coordinate was set using three CORS stations (FAIR, CENA, PBOC).

The cross comparison yielded results within 10cm horizontal and 25cm vertical for the two base
solutions.  Absolute accuracy for the above coordinate is estimated to be within 20cm horizontal
and 50cm vertical.  

These data DO NOT conform to NGS CORS standards.
http://www.ngs.noaa.gov/CORS/Site_selec_crit.html

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EQUIPMENT

Base files were collected using a Trimble ProXR receiver with a standard, mapping grade, L1 antenna.
The antenna is mounted on a secure mast above the Winter Lab building at Toolik Field Station,
mile 284.5 Dalton Highway, Alaska.  Neither the mast nor the building has a concrete foundation, resting
instead on a compacted gravel pad.  Small errors of unknown magnitude may result from subtle shifts
and/or settling of the building and gravel pad.  

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SOFTWARE

Base data are collected using Trimble Reference Station 1.02 on a Windows2000 operating system.
Files are delivered in a standard, zipped format.

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CONTACT

Any questions or problems should be addressed to:

Andrew W. Balser
GIS & Remote Sensing Manager
Toolik Field Station
Institute of Arctic Biology, 311 Irving I
University of Alaska Fairbanks
Fairbanks, AK 99775-7000

(907) 474-2466 (phone)
(907) 474-2512 (phone2)
fnawb@uaf.edu
www.uaf.edu/toolik/