Toolik Field Station - IAB - UAF

GPS BASE STATION README - 2005

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BASE COORDINATE

WGS84:
	Decimal Degrees
		68.62753421N, 149.5977575W,
	Degrees, Minutes, Seconds
		68°37'39.12315"N, 149°35'51.92700"W
	UTM (zone 6N)
		394375.574E, 7615061.737N

ECEF:
	X:  	-2010840.781m
	Y: 	-1179859.074m
	Z: 	 5917646.956m

NAD27 Alaska:
	Decimal Degrees
		68.62788910N, 149.59483399W,
	Degrees, Minutes, Seconds
		68°37'40.40077"N, 149°35'41.40239"W
	UTM (zone 6N)
		394491.487E, 7614915.706N
	Albers ALASKA
		180974.960E, 2079861.953N

Elevation:
	WGS84:
		No geoid:	740.129m(HAE)
		GEOID99 Alaska:	734.138m(MSL)
		GEOID96 Alaska:	733.190m(MSL)
		EGM96 Global:	733.713m(MSL)
	NAD27 Alaska:
		No geoid:	740.112m(HAE)
		GEOID99 Alaska:	734.138m(MSL)
		GEOID96 Alaska:	733.190m(MSL)
		EGM96 Global:	733.713m(MSL)


The base coordinate is derived from an AUTOGIPSY solution of 7 days of continuous RINEX
data.

AUTOGIPSY is a public service administered by the Jet Propulsion Lab, NASA
in Pasadena, CA.  
http://milhouse.jpl.nasa.gov/ag/
http://www.unavco.org/facility/software/processing/gipsy/auto_gipsy_info.html

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 NetRS receiver with a dual frequency Zephyr Geodetic antenna.
The antenna is mounted atop 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, or from occasional strong winds.  The mast is secured
by three cable stays attached to the building corners and the mast is bolted at its base and part of
its length to the building.

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SOFTWARE

Base data are collected using Trimble NetRS v1.1-2
Files are produced as Trimble T00 files, then converted to .dat, .ssf and RINEX formats
on a Linux (Fedora Core) box using a script provided by UNAVCO.

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FILES

Base files are collected hourly (T00, DAT & SSF) and daily (T00 & RINEX)
Hourly files contain 1 second observations and 1 minute positions
Daily files contain 30 second observations and 5 minute positions

Naming conventions:

	Note: all dates and times are in UTC (GMT)
	UTC = 8 hours ahead of Alaska Daylight Time, and 9 hours ahead of Alaska Standard Time

File names are generated in the format
"SystemNameYYYYMMDDHHmmS.ext"

	where:
		SystemName = "tool"
		YYYY = Year
		MM = Month
		DD = Day
		HHmm = Hour and Minute UTC
		S = session ID: ('d' for hourly files, 'r' for daily files)
		.ext = .T00,  .DAT,  .SSF


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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/gis/