WHAT IS CORS

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WHAT IS CORS?
Charlie Challstrom Director, National Geodetic
Survey Richard Snay Manager, National CORS
Program CORS Industry Forum March 26, 2001
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Everyone is able to know where they are and
where other things are anytime, anyplace!
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a a a a a a a a a
The National Geodetic Survey, under NOAA,
effectively launched our industry. Charles
Trimble, Chair, U.S. GPS Industry
Council


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Positioning the Nation
a a a a a a a a
National Ocean Service

• GPS Industry
• Aviation
• Space Systems
• Communications
• Automotive
• Shipping/Air/Ground/Water
• Agriculture
• Banking
• Lumber

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The National Spatial Reference System A Seamless
System for Americas Infrastructure!
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Continuously Operating Reference Stations
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REGIONAL CORS COVERAGE
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CORS SITES
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CORS OVERVIEW

• Network contained 216 sites as of March 2001
• Growing at rate of 3 sites per month
• Provides code range (C/A, P1, P2)
• and carrier phase observations (L1, L2)
• Provides meteorological data at some sites
• Designed to meet post-processing requirements for
• Positioning
• Navigation
• Meteorology
• Geophysics

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CORS OVERVIEW-CONTINUED

• All CORS data transferred to NGSs office in MD
• GPS and met data converted to RINEX format
• Data made available to public via
• World Wide Web
• File transfer protocol
• Data kept online for at least 4 years
• Data archived on CD-ROMs

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COOPERATIVE CORS

• GPS base stations whose data are freely
  disseminated by cooperating organizations
• NGS provides link from its web site to that of
  each cooperating organization
• Site coordinates must be consistent with the
  National Spatial Reference System

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a a a a a a a a
CORS PARTNERS FEDERAL
Federal Highway Administration Federal Railway
Administration Federal Aviation
Administration Forecast Systems
Laboratory NASA US Geological Survey US Army
Corps of Engineers US Air Force US Naval
Observatory
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CORS PARTNERS STATES
California Spatial Reference Center
Current Pending
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CORS PARTNERS SCIENTIFIC
International GPS Service (IGS) University
Navstar Consortium (UNAVCO) Scripps Orbit
Permanent Array Center
PANGA
EBRY
BARD
BAYONET
BARGN
SCIGN
Plate Boundary Observatory SuomiNet
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CORS PARTNERS INTERNATIONAL
Canada
International Earth Rotation Service
(IERS) International GPS Service (IGS)
Mexico
Guatemala El Salvador Honduras Nicaragua
Jamaica
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MONITORING PRECIPITABLE WATER VAPOR
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MAPPING TOTAL ELECTRON CONTENT (TEC)
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MONITORING CRUSTAL MOTION
a a a a a a a a
Harvard-Smithsonian Calif. Inst. of Technology
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FUTURE DIRECTIONS OF CORS PROGRAM

• Incorporate additional sites
• Enhance auxiliary models to improve positional
  accuracy shorten observing sessions
• Provide earlier access to CORS data and models

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HOW DOES NGS COLLECT CORS DATA
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DGPS/NDGPS COVERAGE (Feb. 2001)
Dual coverage Single coverage
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SITES WITH MET SENSORS
Forecast Systems Laboratory
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Positioning Height Modernization
GPS Buoy Monitoring Water Levels
GPS-guided aircraft operations
GPS Cm-level Positioning of Ships Pitch, Roll
and Squat
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