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ToolikMapEngine
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last modified:
January 8, 2008 16:30
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Toolik
Field Station maintains a continuous GPS base station for use by
the Toolik community and the general public. The base station runs
continuously year-round (since May 2006), with
files permanently archived and available for download through this
website (links below).
2001 - 2003
From
May 2001 - August 2003 the base receiver was a Trimble ProXR (mapping
grade), supporting code (RTK and post-processed) and carrier phase
(post-processed) corrections. Under optimal circumstances, code corrected
data can deliver accuracy to within several meters, and carrier corrected
data can deliver sub-meter accuracy. Toolik Field Station was closed from September to April during these years, and archived data from this period cover only the summer months.
2004 - Present
In May 2004 the Toolik Field
Station GPS Base was upgraded to a Trimble 5700 (survey grade), which
supports survey and mapping grade corrections (RTK and post-processed).
In April 2005,
the base was upgraded to a Trimble NetRS (survey grade) which supports
mapping and survey grade corrections (post-processed and RTK), and
is configured through a web interface. Since April 2006 Toolik Field Station has been in year-round operation, and our GPS archive contains and almost unbroken data string since that time.
Please
see the Equipment Page for detailed descriptions of the base station components as well as
GPS rover units available for use at the station.
 .. .. ..
DISCLAIMER
Please
review the readme files in the table below to ensure that these basefiles
are appropriate for your needs. Toolik Field Station and the Institute
of Arctic Biology, UAF offer no guarantees for this data beyond
the documentation provided, and are not responsible for any misuse
of the data, or for analytical results from use of this data.
FILES
|
YEAR |
RECEIVER |
FILES |
README |
BASE
COORD (WGS84-ITRF00, HAE) |
|
2001 |
Trimble
ProXR |
|
|
68.62753149N,
149.5977264W, 731.947m |
|
2002 |
Trimble
ProXR |
|
|
68.62753149N,
149.5977264W, 731.947m |
|
2003 |
Trimble
ProXR |
|
|
68.62753149N,
149.5977264W, 731.947m |
|
2004 |
Trimble
5700 |
|
|
|
|
|
68.62753421N,
149.5977575W, 740.129m |
|
2005 |
Trimble
NetRS |
|
|
|
|
|
68.62753421N,
149.5977575W, 740.129m |
|
2006 |
Trimble
NetRS |
|
|
|
|
|
68.62753421N,
149.5977575W, 740.129m |
2007 |
Trimble
NetRS |
|
|
|
|
|
68.62753385N, 149.59775803W, 739.572m |
2008 |
Trimble
NetRS |
|
|
|
|
|
68.62753385N, 149.59775803W, 739.572m |
TFS BASE COORDINATE
(from NGS OPUS Solution, 1/6/07, 24 hour file., 30 sec. obs.)
|
WGS84 - ITRF00 (EPOCH: 1997.0) a.k.a (G1150) |
Decimal
Degrees |
68.62753578N |
149.59775535W |
Degrees
Minutes Seconds |
68°37'39.12884"N |
149°35'51.91926"W |
|
WGS84 - ITRF00 (EPOCH: 2007.0151) |
|
Decimal
Degrees |
|
68.62753385N |
149.59775803W |
|
Degrees
Minutes Seconds |
|
68°37'39.12186"N |
149°35'51.92891"W |
ECEF |
|
X:
-2010840.781m |
Y: -1179859.074m |
Z: 5917646.956m |
| NAD83 (CORS96) (EPOCH: 2003.0) |
|
Decimal
Degrees |
|
68.6275346N |
149.597725013W |
|
Degrees
Minutes Seconds |
|
68°37'39.12456"N |
149°35'51.81005"W |
|
UTM
meters (Zone 6 North) |
|
394376.897E |
7615061.725N |
|
ELEVATION |
WGS84-ITRF00(EPOCH: 1997.0) |
No
Geoid Model |
740.016m(HAE) |
GEOID06
Alaska zone 2 |
735.493m(MSL) |
|
WGS84-ITRF00(EPOCH: 2007.0151) |
|
No
Geoid Model |
740.023m(HAE) |
|
GEOID06
Alaska zone 2 |
735.050m(MSL) |
|
NAD83
(CORS96) (EPOCH: 2003.0) |
|
No
Geoid Model |
739.572m(HAE) |
|
GEOID06
Alaska zone 2 |
735.050m(MSL) |
OTHER LOCAL SURVEY CONTROL
These data are designed to help those needing coordinate control in the Toolik area. We are in the process of tying in published NGS benchmarks using 24hour dual frequency occupations processed against the TFS GIS permanent NetRS base station. We are also adding aluminum-cap monuments on rebar drilled into stable rock in areas of sparse coverage.
Benchmarks listed below include both (a) Description and (b) GPS Processing Report.
Check back periodically for additions and updates.
NGS published Benchmarks:
Descriptions
Processing Reports
Datasheets & Additional Info for Published NGS Benchmarks
(NGS Website)
TFS-installed Benchmarks:
Descriptions
Processing Reports
NGS published Benchmarks - not tied-in - reference only :
Shapefile of All Benchmarks within 30 miles of Toolik Field Station
--> note: THIS SHAPEFILE IS NOT CONTROL QUALITY in either the featrures themselves, or in most cases the feature attributes. It is a basic reference provided by NGS to help identify existing monuments. These monuments should be tied-in to an existing base station before they are used for survey-grade work.
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