[Parameters: Topic='SOLID EARTH', Term='GEODETICS/GRAVITY', Variable_Level_1='CONTROL SURVEYS']
NOAA CLASS archive: Continuously Operating Reference Stations (CORS)Entry ID: gov.noaa.class.CORS
Abstract: ABSTRACT: The National Geodetic Survey (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.
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, Africa and Afghanistan.
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
Purpose: PURPOSE: NGDC archives the CORS data set as per the NOAA/NOS Records Disposition Schedule, section 1602-12.
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 CLASS archive: Continuously Operating Reference Stations (CORS)
Dataset Release Date: 2010-10-01
Dataset Release Place: Boulder, CO
Dataset Publisher: DOC/NOAA/CLASS > Comprehensive Large Array-data Stewardship System, NOAA, U.S. Department of CommerceOnline Resource: http://www.class.ngdc.noaa.gov/
Start Date: 2010-10-01
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 - < 10 meters
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 CLASS 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 are ingested by NGS and are posted to the NGS online servers as daily files in RINEX format (ASCII). The NGDC archive has automated daily routines that selectively pull in the daily observational files at the original sampling rate, the daily observational summary file, the daily broadcast ephemeris files, and any corresponding meteorological files. Each site has a metadata record retained as a site log file (ASCII).
PROCESS DATE: 201010
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 CLASS archive: Continuously Operating Reference Stations (CORS) .
PUBLICATION DATE: 2010-10-.
PUBLICATION PLACE: Boulder, CO .
PUBLISHER: DOC/NOAA/CLASS > Comprehensive Large Array-data Stewardship System, NOAA, U.S. Department of Commerce .
ONLINE LINKAGE: http://www.class.ngdc.noaa.gov/ .
ONLINE LINKAGE: http://www.ngs.noaa.gov/CORS/ .
ONLINE LINKAGE: http://alt.ngs.noaa.gov/CORS/ .
TYPE OF SOURCE MEDIA: digital files via FTP .
SOURCE TIME PERIOD OF CONTENT/BEGINNING TIME: 201011 .
SOURCE TIME PERIOD OF CONTENT/ENDING TIME: Present .
SOURCE CURRENTNESS REFERENCE: ground condition .
SOURCE CITATION ABBREVIATION: GNSS .
SOURCE CONTRIBUTION: GNSS data in RINEX format (ASCII) and station metadata (ASCII)
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
Role: DIF AUTHOR
Email: Francine.Coloma at noaa.gov
Province or State: CO
Postal Code: 80305
Creation and Review Dates
DIF Creation Date: 2010-08-09
Last DIF Revision Date: 2011-11-02