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SDDOT / Road Design / Survey Data / GPS CORS Information The Continuously Operating Reference Station (CORS) is a cooperative effort between the Office of Road Design and the Office of Planning and Programs. The CORS, a Trimble 4000SSI receiver with its antenna, is located on top of the Becker-Hansen Building in Pierre, South Dakota. The CORS has been in operation since 1993 and the horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in July 1997. SDDOT CORS Specifications Operating Parameters    Latitude: 44° 22' 04.01400"    Longitude: 100° 20' 35.52561"    Datum: NAD 1983/1996    Ellip Height: 442.63 meters    Geoid Height: -23.42 meters    Elevation Mask: 10°    Logging Interval: 5 Seconds The above information can also be found at the NGS Data Sheet web page under PID AA2870 Operating Times    Logging Time: 24 hours    Days Enabled: 7 Days a Week    File Transfer Time: Hourly    File Duration: 1 Hour CORS Files    Download Compressed File Format: Zip Files    File Format: Trimble SSF, Trimble DAT, RINEX    On-line Access Period: 60 Days    File Naming Convention: SDPR = South Dakota, Pierre YYYY = Year (e.g. 2004) MM = 2 digit month number (e.g., 01 = January) DD = 2 digit day number HH = 2 digit hour indicator based on UTC (e.g., 00 = 1st hour of day, 23 = last hour .ZIP = extension of the file name indicating the files are zipped files Disclaimer The South Dakota Department of Transportation, Office of Road Design provides the CORS web site and its services as a convenience for its customers and disclaims all warranties relating to the CORS Web site and the information contained herein, whether expressed or implied, including without limitation any implied warranties of fitness for a particular purpose, functionality, data integrity, or protection. Department of Transportation will not be liable for any special, incidental, consequential, indirect or similar damages due to the use or misuse of the CORS web site and the information contained herein, even if the SDDOT has been advised of the possibility of such damages. The person or entity using the CORS web site and the information contained on it bears all risk as to the use and application of this information. Furthermore, the SDDOT does not guarantee that the CORS base station, the CORS web site, or data will be operating or available at any given time. Use of this system and its data is at the user's own risk. The CORS web site is provided as a service and convenience to the Public and is setup at the pleasure of SDDOT. This service may be discontinued with no advance notice by the operators or service to users discontinued for abuse or misuse of the system. CORS Contacts Direct questions or comments about the CORS to: Michael Jordan Lead Project Engineer (605)773-3433 michael.jordan@state.sd.us Richard Hylle Engineering Technician (605)773-3433 richard.hylle@state.sd.us CORS Data CORS files are no longer being updated on the website as of March 6, 2006. If you need some of these files, please contact Michael Jordan at 773-4427 or by e-mail DAT Files SSF Files RINEX Files

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