12. 540 Principles of the Global Positioning System Lecture 21 Prof. Thomas Herring 5/05/3 12.540Lec21 Summary Sources of gps data and results Major international organizations involved in GPS Examine access to gPs data Examine access to gPs result 05/503
05/05/03 12.540 Lec 21 1 12.540 Principles of the Global Positioning System Lecture 21 Prof. Thomas Herring 05/05/03 12.540 Lec 21 2 – Major international organizations involved in GPS – Examine access to GPS data – Examine access to GPS results Summary • Sources of GPS data and results 1
GPS Groups/Gs There are many international and national groups involved in the deployment of GPS The international organization is the International GPs Service(IGs) Started as pilot project by the International Association of Geodesy(IAG)in 1992 Data collection(standards for stations) Data dissemination( through several archives Data analysis(IGS analysis centers) Analysis improvements(working groups and standards) 5/05/3 12.540Lec21 如m盟 mawl,da Current IGs Network(approximately 200 stations) 05/503 12540Lec21
GPS Groups/IGS • There are many international and national groups involved in the deployment of GPS. • The international organization is the International GPS Service (IGS) • Started as pilot project by the International Association of Geodesy (IAG) in 1992. • Involves: – Data collection (standards for stations) – Data dissemination (through several archives) – Data analysis (IGS analysis centers) – Analysis improvements (working groups and standards) 05/05/03 12.540 Lec 21 3 05/05/03 12.540 Lec 21 4 Current IGS Network (approximately 200 stations) 2
cm!1e204 North american portion of network 50503 eC 21 密+ sssm: European part of network 05/503 12540Lec21
05/05/03 12.540 Lec 21 5 North American Portion of network 05/05/03 12.540 Lec 21 6 European part of network 3
IGS Data for each IGs station is openly available usually within <1 day of collection. Some sites are available hourly The central bureau of the igs is located at http:/igscb.ipl.nasagov/ Explore site for structure: Web site index gives an overview of page content 5/05/3 12.540Lec21 US Groups There are a number of large Us groups that run gPs networks Largest array is the southern california Integrated array (SCIGn) with 250 stations http://www.scign.org/ Other groups in the Western United States have networks of 20-50 stations In all over 400 geophysical class stations in Western US 05/503
05/05/03 12.540 Lec 21 7 IGS http://igscb.jpl.nasa.gov/ 05/05/03 12.540 Lec 21 8 http://www.scign.org/ • Data for each IGS station is openly available usually within <1 day of collection. Some sites are available hourly. • The central bureau of the IGS is located at: • Explore site for structure: Web site index gives an overview of page content. US Groups • There are a number of large US groups that run GPS networks. • Largest array is the Southern California Integrated array (SCIGN) with 250 stations • Other groups in the Western United States have networks of 20-50 stations. In all over 400 geophysical class stations in Western US. 4
National Geodetic Survey CORS Main reference frame of the united states Continuously Operating Reference Stations CORS http://www.ngs.noaagov/cors/ Serves the geodetic control needs of the US about 300 GPs sites currently in the network many of them shared with other institutions 5/05/3 12.540Lec21 Western US Groups Networks in the western United states BARD (Bay Area Regional Network /quake. geo. berkeley. edu/bard/ PANGA(Pacific Northwest Geodetic Array) httpwww anda cwu eau ys. washington. edu/GPS/gps. html WCDA Western Canada Deformation Array www.pgc.nrcan.gc.ca/geodyn/wcda.htm EN2 anyang. edu吗9 For list of arrays .edu/cgi-bin/db ShowArraySitesMap cgi Explore these web sites 05/503
National Geodetic Survey CORS • Main reference frame of the United States. • Continuously Operating Reference Stations (CORS) • http://www.ngs.noaa.gov/CORS/ • Serves the geodetic control needs of the US. • About 300 GPS sites currently in the network many of them shared with other institutions. 05/05/03 12.540 Lec 21 9 Western US Groups • Networks in the Western United States – BARD (Bay Area Regional Network) http://quake.geo.berkeley.edu/bard/ – PANGA (Pacific Northwest Geodetic Array) http://www.panga.cwu.edu/ http://www.geophys.washington.edu/GPS/gps.html – WCDA Western Canada Deformation Array http://www.pgc.nrcan.gc.ca/geodyn/wcda.htm – BARGEN (Basin and Range Geodetic Network) http://cfa-www.harvard.edu/space_geodesy/BARGEN/ – For list of arrays see: http://sopac.ucsd.edu/cgi-bin/dbShowArraySitesMap.cgi • Explore these web sites. 05/05/03 12.540 Lec 21 10 5
Availability of processed gPs data Many of the network groups put analyzed results on their web pages as well as access to data IGs also sponsors 7 global analysis groups(funding comes from other sources) SCIGn uses three analysis groups http:/milhouse.ipl.nasa.gov/scign/analysis/ http://sopac.ucsdedu/cgi- bin/db ShowArraySitesMap cqi?array=SCIGN httppasadenaWr.usgs.gov/scign/analysis/ 5/05/3 12.540Lec21 Other important groups University Navstar Consortium(UNAVCO) facility and corporation http://www.unavco.ucar.edu/ http://www.unavco.org Supports a variety of applications of GPS. Initially tectonic deformation but now antarctic Research and low-precision GIS applications Supports US Universities in installing GPS through out the world for geophysical studies 05/503
Availability of processed GPS data • Many of the network groups put analyzed results on their web pages as well as access to data. • IGS also sponsors 7 global analysis groups (funding comes from other sources). • SCIGN uses three analysis groups: http://milhouse.jpl.nasa.gov/scign/analysis/ http://sopac.ucsd.edu/cgibin/dbShowArraySitesMap.cgi?array=SCIGN http://pasadena.wr.usgs.gov/scign/Analysis/ 05/05/03 12.540 Lec 21 11 Other important groups • University Navstar Consortium (UNAVCO) facility and corporation http://www.unavco.ucar.edu/ http://www.unavco.org • Supports a variety of applications of GPS. Initially tectonic deformation but now Antarctic Research and low-precision GIS applications • Supports US Universities in installing GPS through out the world for geophysical studies. 05/05/03 12.540 Lec 21 12 6
Summary Data from thousands of gps stations are collected and processed each data Largest single array is in Japan(>1000 stations) GPs developments are like the internet development: Many active contributors but often quality is debatable 5/05/3 12.540Lec21
05/05/03 12.540 Lec 21 13 stations) Summary • Data from thousands of GPS stations are collected and processed each data • Largest single array is in Japan (>1000 • GPS developments are like the internet development: Many active contributors but often quality is debatable. 7
