TOOLIK FIELD STATION GPS BASE
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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 through the summer field season (May - August), with files permanently archived and available for download through this website. |
see Base Files page for .dat .ssf .rnx file downloads
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EQUIPMENT
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Receiver: |
Trimble 5700 Survey Grade w/internal batteries, external power, Sandisk 128mb flashcard |
| Receiver Config file: | |
| Receiver Antenna: | Trimble Zephyr Geodetic, w/ 30m cable |
| Radio: |
Pacific Crest RFM96W |
| Radio broadcast frequency: | 464.500 MHz |
| Radio broadcast antenna: | Base Omni 5dB |
| Computer: | Dell GX200, Pent III, 1GHz, 1.2Mb RAM |
| Software: | Trimble Reference Station 1.02 |
TOOLIK FIELD STATION SURVEY GRADE ROVER
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Toolik Field Station provides survey grade field GPS services for registered users, administrators and managers. Accuracies range from greater than 10cm to sub-centimeter depending on distance from base station and field method (see tables below)Applications include but are not limited to: |
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| -Stream channel morphology | |
| -Archiving of research plot locations | |
| -Facility / building survey | |
| -Localized, fine-scale DEM creation | |
| -Long-term glacial and tectonic monitoring | |
| -Precise landscape metrics | |
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EQUIPMENT
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Receiver: |
Trimble 5700 Survey Grade w/ internal/external batteries, , Sandisk 128mb flashcard |
| Receiver Antenna: | Trimble Zephyr Kinematic/Geodetic, w/ 10m & 1.6m cables |
| Receiver Config file: | |
| Receiver Controller: | Trimble TSCe w/ 2m cable |
| Controller Firmware: | Trimble Survey Controller CE |
| Bipod / Rangepole: | Trimble 2m carbon fiber |
| Radio: |
Pacific Crest RFM96W |
| Radio receive frequency: | 464.500 MHz |
| Radio receive antenna: | 1m Whip & 10cm rubber |
TOOLIK FIELD STATION MAPPING GRADE ROVERS
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Toolik GIS provides a range of mapping grade receivers for use by station residents, administrators and managers. These are suitable for myriad applications, and all support the use of data dictionaries, allowing the user to enter field measurements and various attributes while recording the features in the field with the GPS. Data dictionaries can be customized to meet the users' field needs and offer very flexible and effieicnt data capture. With minimal processing after the user returns from the field, the data can be distributed in a variety of formats including tablular (e.g. excel), GIS (shapefile, coverage), or delimited text. |
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EQUIPMENT
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| Receiver A: | Trimble GeoExplorer3, with accessory 2m antenna | |
| Receiver B: | Trimble GeoExplorer3, with accessory 2m antenna | |
| Receiver C: | Trimble GeoXT, with accessory 2m antenna (WinCE) | |
| Receiver D: | Trimble GeoXT, with accessory 2m antenna (WinCE) | |
| Receiver E: | Trimble ProXR, w/external batteries | |
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Receiver F: |
Trimble ProXR, w/external batteries | |
| Receiver F Antenna: | Trimble Standard L1, w/ 10m cable | |
| Receiver F Controller: | Trimble TSC1 w/ 2m cable | |
| Controller Firmware: | Trimble Asset Surveyor 5.2 | |
| Receiver F Radio: | Pacific Crest RFM96W, 2 watt | |
| Radio receive frequency: | 464.500 MHz | |
| Radio receive antenna: | 1m Whip & 10cm rubber | |
TOOLIK USERS' RECREATIONAL GRADE ROVERS
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Toolik GIS provides limited support for registered residents who bring their own recreational grade GPS units to the station. We can help users configure their GPSes and ensure that they are set to the appropriate coordinate system/datum for use with maps, coordinate lists and waypoints while they are working at Toolik. Users are expected to have and maintain any software required for their units, and to perform their own waypoint / data entry from information provided by Toolik GIS. |
TYPICAL GPS ACCURACIES
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SURVEY GRADE
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Method |
Typical accuracy |
Occupation time |
Typical applications |
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Continuous |
< 0.5 cm |
Months or more |
Crustal deformation, geophysics, reference stations |
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Static |
0.5 cm – 5 cm |
Hours to days |
Crustal deformation, geodetic control, very long baseline surveys, geophysics |
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Rapid Static |
1 cm – 5 cm |
Minutes |
Short baseline surveys, glaciology |
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Kinematic |
1 cm – 5 cm |
Seconds |
Short baselines, closely spaced points, vehicle positioning, feature surveys, GIS and mapping |
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MAPPING GRADE
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Method |
Typical accuracy |
Occupation time |
Typical applications |
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Code Differential |
50 cm – 300 cm |
Seconds |
Coarse GIS, mapping, positioning |
| Carrier Differential | 15 cm – 100 cm | Minutes | GIS, mapping, positioning |
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RECREATIONAL GRADE
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Method |
Typical accuracy |
Occupation time |
Typical applications |
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Point positioning |
100 cm – 800 cm |
Minutes to hours |
Rough positioning (uncorrected) |
Back to the Toolik Field Station Homepage
This page last updated: July 16, 2004 10:46 AM AST