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University of Arkansas at Monticello CORS

The Spatial Analysis Lab (SAL) became a participating member of the National Geodetic Survey's Cooperative CORS (Continuously Operating Reference Station) network in February 2003 to better serve the state of Arkansas and the nation as a leader in spatial technologies.

 

NGS Cooperative CORS

Site Log Information
Surveying GPS Antenna Information
NGS GPS Antenna Calibration
OPUS (Online Positioning User Service)
Base Station Coordinate Information
Introduction to GPS Presentation
Current Time in Coordinated Universal Time (UTC)
Base Station Service Area Map
Downloading Instructions for GPS Data

(You will need an unzip utility - Winzip)
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Download Winzip
Disclaimer


Naming Convention

Each Receiver Independent Exchange (RINEX) file is named using a ssssdddh.rin.zip format.  ssss represents the four character station name (CSAL), ddd is the Julian Date, h is the hour long UTC time block, and rin is the file type.  For example, a RINEX file from this site containing data for 3:00 pm to 4:00 pm (central standard time) on February 17, 2003 would be named CSAL048v.rin.zip

All other files are named using a yymmddhh.zip format.  yy represents the year, mm is the month, dd is the day, and hh is the hour long UTC time block. 

 

Survey Community Base Station Information

The SAL maintains a Trimble 4700 CORS System with 12 channels, L1 C/A code, L1/L2 full cycle carrier with Trimble Reference Station (TRS) software.  The antenna is a Trimble CORS/Choke Ring 29659-00

 

CSAL CORS Site Overview
Datum: NAD 83 (EPOCH 2002.0)
Latitude: 33° 35' 31.13684" N
Longitude: 91° 48' 53.23042" W
Ellipsoid Height: 66.824m
Elevation Mask: 10°
Logging Interval: 5 s
Rollover Period: 1 hour


The base station antenna is positioned at:

 

***ITRF 00***
MONTICELLO COOP (CSAL), ARKANSAS

Retrieved from NGS DataBase on 01/29/03 at 16:50:24.

Antenna Reference Point(ARP): MONTICELLO COOP CORS ARP
------------------------------------------------------
PID = DF3567

ITRF00 POSITION (EPOCH 1997.0)
Computed by OPUS in Jan 2003 using 10 days of data.
           X =         -168430.115 m             latitude       =        33 35 31.15882 N
           Y =       -5315818.368 m             longitude    =      091 48 53.25299 W
           Z =        3508874.033 m            ellipsoid height         =          65.549 m

ITRF00 VELOCITY
Predicted with on-line HTDP Jan 2003.
           VX =    -0.0149 m/yr                    northward =      -0.0029 m/yr
           VY =    -0.0014 m/yr                      eastward =      -0.0148 m/yr
           VZ =    -0.0022 m/yr                         upward =       0.0003 m/yr

NAD_83 POSITION (EPOCH 2002.0)
Computed by OPUS in Jan 2003 using 10 days of data.
           X =          -168429.579 m                 latitude   =       33 35 31.13684 N
           Y =        -5315819.822 m              longitude   =     091 48 53.23042 W
           Z =         3508874.174 m              ellipsoid height       =         66.824 m

NAD_83 VELOCITY
Predicted with on-line HTDP Jan 2003.
          VX =         0.0000 m/yr               northward   =        0.0000 m/yr
           VY =         0.0000 m/yr                eastward   =        0.0000 m/yr
           VZ =         0.0000 m/yr                   upward   =        0.0000 m/yr

 
L1 Phase Center of the current GPS antenna: MONTICELLO COOP CORS L1 PC C
---------------------------------------------------------------------------------------------------------------------
The D/M element, chokerings, -radome antenna
(Antenna Code = TRM29659.00) was installed on 09/11/01.
                 The L2 phase center is 0.018 m above the L1 phase center.
                                                     PID = DF3568

ITRF00 POSITION (EPOCH 1997.0)
Computed by OPUS in Jan 2003 using 10 days of data.
               X =        -168430.117 m                 latitude    =       33 35 31.15885 N
                Y =      -5315818.459 m             longitude    =     091 48 53.25297 W
                Z =       3508874.095 m             ellipsoid height      =           65.659 m

The ITRF00 VELOCITY of the L1 PC is the same as that for the ARP.

NAD_83 POSITION (EPOCH 2002.0)
Computed by OPUS in Jan 2003 using 10 days of data.
                X =        -168429.581 m                latitude    =        33 35 31.13688 N
                 Y =      -5315819.913 m            longitude    =      091 48 53.23040 W
                 Z =       3508874.236 m            ellipsoid height      =            66.933 m

The NAD_83 VELOCITY of the L1 PC is the same as that for the ARP.

DGPS information is collected 24 hours a day, 7 days a week and placed on SAL's Web server on an hourly basis.  The logging interval is 5 seconds.
This data along with other associated data can be accessed through the SAL's web site. Please download the README file or click to see INSTRUCTIONS for further information about availability and accessibility of DGPS data.

GPS Base Station DISCLAIMER

The Global Positioning System digital data on this site was collected by the Spatial Analysis Laboratory in the School of Forest Resources at the University of Arkansas in Monticello. Neither the University of Arkansas nor any agency thereof, nor any of their employees, make any warranty, for the accuracy, completeness, or usefulness of any GPS differential information. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the University of Arkansas. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the University of Arkansas.