NOAA archive: Continuously Operating Reference Stations (CORS)Entry ID: gov.noaa.ngdc.G10019
Abstract: The National Geophysical Data Center (NGDC) is the designated archive of the Continuously Operating Reference Stations (CORS) data set from the National Geodetic Survey (NGS). This record is for the CORS data that has been archived to tape at NGDC. NGS, an office of NOAA's National Ocean Service (NOS), coordinates a network of geodetic-quality CORS stations that provide Global Positioning System ... (GPS) carrier phase and code range measurements in support of 3-dimensional positioning activities throughout the United State and its territories. The positions of these CORS sites help define the National Spatial Reference System (NSRS). NGS defines and manages the NSRS - the framework for latitude, longitude, height, scale, gravity, orientation and shoreline throughout the U.S. The NSRS provides a consistent national coordinate system to support mapping, charting, navigation, boundary determination, property delineation, infrastructure development, resource evaluation surveys, and scientific applications. The CORS system enables positional accuracies that approach a few centimeters relative to the NSRS, both horizontally and vertically.
Purpose: NGDC archives the CORS data set as per the NOAA/NOS Records Disposition Schedule, section 1602-12.
SUPPLEMENTAL INFORMATION: The United States operates the Global Positioning System (GPS). The term Global Navigation Satellite Systems (GNSS) has been created to reference all navigation satellite systems. GNSS encompasses the U.S. GPS system, the Russian Federation GLONASS system, ... and any future systems such as Europe's Galileo or China's Compass.
CURRENTNESS REFERENCE: ground condition
SPATIAL DATA ORGANIZATION INFORMATION
Indirect Spatial Reference: CORS data reference the U.S. and its territories, with selected areas in the Caribbean, Central America, Iraq, and Africa.
SPATIAL REFERENCE INFORMATION - GEODETIC MODEL
Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378137
Denominator of Flattening Ratio: 298.257
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: DOC/NOAA/NOS/NGS > National Geodetic Survey, National Ocean Service, NOAA, U.S. Department of CommerceDOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp.)
Dataset Title: NOAA archive: Continuously Operating Reference Stations (CORS)
Dataset Release Date: 1994-02-
Dataset Release Place: Boulder, CO
Dataset Publisher: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of CommerceOnline Resource: http://www.ngdc.noaa.gov/ngdcinfo/cors.html
Start Date: 1994-02-01
Latitude Resolution: 0.00001 Decimal seconds
Longitude Resolution: 0.00001 Decimal seconds
Horizontal Resolution Range: 1 meter - < 30 meters
Vertical Resolution: 1.0 mm
Vertical Resolution Range: < 1 meter
SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE PROPERTIES > TOTAL ELECTRON CONTENT
SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > CONTROL SURVEYS
SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > CRUSTAL MOTION
SOLID EARTH > GEODETICS > COORDINATE REFERENCE SYSTEM
SOLID EARTH > TECTONICS > PLATE TECTONICS
Quality ATTRIBUTE ACCURACY REPORT: The carrier phase observations are accurate to a few centimeters, once biases have been removed.
LOGICAL CONSISTENCY REPORT: To become part of the CORS network, each site must pass through NGS' site criteria standards and maintain its integrity. Automated routines at NGDC pull data staged by NGS at regular intervals.
... COMPLETENESS REPORT: Data written to the NGDC archive is reviewed for completeness. Automated routines perform daily checks for file names and file sizes, and also aided by the internal checksum of GNU zip compression as data is written to tape. Any faulty data is removed from the archive.
HORIZONTAL POSITIONAL ACCURACY REPORT: The horizontal coordinates of the GPS site, specifically the GPS antenna location, are accurate to about a centimeter once biases are removed.
VERTICAL POSITIONAL ACCURACY REPORT: The vertical coordinates of the GPS site, specifically the GPS antenna location, are accurate to about 2 centimeters.
PROCESS DESCRIPTION: GNSS observational data from sites ("internet" sites) are ingested by NGS and are posted to the NGS online servers as daily files in RINEX format. The NGDC archive has automated daily routines that selectively pull in the daily observational files at the original sampling rate, the daily broadcast ephemeris files, and any corresponding meteorological files. Other scheduled routines retrieve higher level orbit files as they are made available. Certain stations, from FAA, the U.S. Coast Guard, NOAA's Earth System Research Laboratory (ESRL), and NGS, make GNSS data available in binary format as input to internal NOAA models such as the US-Total Electron Content product and to produce GPS Meteorology Water Vapor measurements. NGDC, not NGS, has decided to archive the raw data from these GPS stations as a daily tar file consisting of hourly binary files.
PROCESS DATE: 199402
ORIGINATOR: DOC/NOAA/NOS/NGS > National Geodetic Survey, National Ocean Service, NOAA, U.S. Department of Commerce .
ORIGINATOR: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp.) .
TITLE: NOAA archive: Continuously Operating Reference Stations (CORS) .
PUBLICATION DATE: 1994-02-.
PUBLICATION PLACE: Boulder, CO .
PUBLISHER: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce .
ONLINE LINKAGE: http://www.ngs.noaa.gov/CORS/ .
ONLINE LINKAGE: ftp://www.ngs.noaa.gov/cors/rinex/ .
ONLINE LINKAGE: http://www.ngs.noaa.gov/UFCORS .
ONLINE LINKAGE: http://www.ngs.noaa.gov/CORS/download2/ .
ONLINE LINKAGE: http://alt.ngs.noaa.gov/CORS/ .
ONLINE LINKAGE: ftp://alt.ngs.noaa.gov/cors/rinex/ .
ONLINE LINKAGE: http://www.ngdc.noaa.gov/ngdcinfo/cors.html .
TYPE OF SOURCE MEDIA: digital files via FTP .
SOURCE TIME PERIOD OF CONTENT/BEGINNING TIME: 199402 .
SOURCE TIME PERIOD OF CONTENT/ENDING TIME: Present .
SOURCE CURRENTNESS REFERENCE: ground condition .
SOURCE CITATION ABBREVIATION: GNSS .
SOURCE CONTRIBUTION: GNSS observational data in RINEX format and binary format, orbit data, and meteorological data (when available).
Access Constraints ACCESS CONSTRAINTS: None
DISTRIBUTION LIABILITY: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Use Constraints None
Data Set Progress
Distribution Format: ASCII 2.11
Distribution Format: binary Not applicable
Role: DIF AUTHOR
Phone: (303) 497-6826
Fax: (303) 497-6513
Email: ngdc.info at noaa.gov
NOAA/NESDIS/NGDC E/GC 325 Broadway
Province or State: CO
Postal Code: 80305-3328
Creation and Review Dates
DIF Creation Date: 2010-02-19
Last DIF Revision Date: 2010-03-08