Generation of a Weather Database on Crustal Dynamics Data Information System (CDDIS)
The CDDIS Data Center - NASA's Space Geodesy Data Archive · · 2013-11-29THE CDDIS DATA CENTER...
Transcript of The CDDIS Data Center - NASA's Space Geodesy Data Archive · · 2013-11-29THE CDDIS DATA CENTER...
THE CDDIS DATA CENTER — NASA'S SPACE GEODESY DATA ARCHIVE
Carey Noll and Maurice DubeNASA GSFC
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GPS SiteGLONASSSLR SiteVLBI SiteDORIS Site
Fortaleza
Arequipa
Bogotá
Santiago
Brasilia
La Plata
Kourou
Easter Island
Galapagos Islands
Limón
Tahiti
Kokee Park
Mauna Kea St. Croix
Barbados
Key Biscayne
McDonald
North Liberty
Greenbelt
Ottawa
Lac du Bonnet
EnsenadaPie Town
Quincy
Albert HeadAlgonquin
Colorado SpringsWestford
Mammoth Lakes
St. John's
Washington, D.C.Southern California
Integrated GPS Network(over 50 sites)
Churchill
Schefferville
Penticton
Fairbanks
Flin Flon
HolbergNanoose Bay
Priddis
Ucuelet
Whitehorse
Williams Lake
Whistler
Yellowknife Reykjavík Höfn
Thule
Kangerlussuaq
O'HigginsPalmer
Casey
MawsonDavis
McMurdo
Auckland
Hobart
TidbinbillaPerth
Yaragadee (2)
Karratha
Jabiru
Townsville
NouméaAlice Springs
Macquarie Island
Chatham Islands
PretoriaHartebeesthoek
Sutherland
Rabat
Bahrain
Ascension
Maspalomas
Diego GarciaSeychelles
Cocos Islands
Singapore
Bakosurtanal
Kwajalein
Guam
Taipei
Tsukuba
Shanghai
Kunming
Xi'anWuhan
UsudaTaejonSuwon-shi
Gough Island
AnkaraMadrid
Nicosia
Borowiec
Brussels
Cagliaril'Ebre
KievOndrejov
Grasse
Graz
Herstmonceux
Innsbruk
Bangalore
IrkutskJozefoslaw
Kiruna
Kitab
KootwijkOlsztyn
Malindi
Matera
Mendeleevo
Medicina
Metsahovi
Noto
Yerevan
Ny Ålesund
Oberpfaffenhofen
Onsala
Penc
Mitzpe Ramon
San Fernando
SofiaToulouse
Tromsø
Padova
Villafranca
Westerbork
Zimmerwald
Zweningorod
Zelenchukskaya
Yakutsk
AlmatyBishkek
Petropavlovsk-Kamchatsky
Lhasa
Magadan
Krasnoyarsk
Sanae
-30°
Kerguélen
Genova
Chesapeake Bay(3 sites)
Bermuda
Eastport
Tiksi
South Pole
Urumqi
Wettzell
Yebes
Effelsberg
Simeiz
KashimaMiuraKoganeiTateyama
Mizusawa
Syowa
Fort Davis
Green Bank
Hancock
Brewster
Los Alamos
Owens Valley
Kitt Peak
Goldstone
Bar Harbor
Potsdam
Maidenak
Riyadh
Helwan
Katzively
Komsomolsk
Changchun
Beijing
Simosato
Mt. Stromlo
Haleakala
Monument Peak
Svetloe
Tokyo
Riga
Quezon CityKaygabok Taal
Bilibino
KumtorkalaTalasKhantau Chumysh
ShamsiGebze
Bucharest
Yamoussoukro
Rio Grande
Cordoba
Salta
Aguascalientes
Riobamba
Ohrid
VeneziaOsijek
Arti
Dubrovnik
Santiago de Cuba
Esteli
Chiliwack
Tegucigalpa
ManaguaSan LorenzoGuatemala City
San Salvadore
Richard's Bay
AmmanMetzoki Dragot
Yuzhno-Sakhalinsk
Noril'sk
Ceduna
Darwin
DiyarbakirTrabzon
Istanbul
Kingston
Libreville
Boras
Marion Island
Tristan de Cunha
Rothera
Amsterdam Island
Sainte-Helene
Cachoeira Paulista
La Reunion
DjiboutiColombo
Mt. Everest
Arlit
Ponta Delgada Dionysos
Cibinong
Dakar
Solcorro Island
Rapa
Richmond
Badary
Purple Mountain
Manila
Port Moresby
Terre Adéle
Novosibirsk
Woodinville
Visby
GjØvik
Neustrelitz
Maartsbo
Sèvres Mattersburg
Teddington
WroclawDelft
Mitaka
Lindfield
Brisbane
Poltava
Braunschweig
MbararaFranceville
Caucete
Coyhaique
Punta Arenas
Valparaiso
Faleolo
Futuna
HiloHonolulu
Lihue
Manzanillo
Freeport
Male
Lae
SuvaKoumac
Palmeira
Fredericton
LvivUzhgorod
American Samoa
La Rochelle
Resolute
Holman Island
Inuvik
Gatineau Huegelheim
DresdenFrankfurtTitz
Huegleheim
LeipzigHelgoland
Dunedin
GLOBAL GPS, GLONASS, LASER, VLBI, AND DORIS NETWORKS
CDDIS OVERVIEWThe Crustal Dynamics Data Information System (CDDIS) is a dedicated data center supporting the international space geodesy community, providing easy and ready access to a variety of data sets, products, and information about these data. The data center was established in 1982 as a dedicated data bank to archive and distribute all Crustal Dynamics Project-acquired data and information about these data. Today, the CDDIS continues to serve as the NASA archive and distribution center for space geodesy data, particularly Global Positioning System (GPS), Global Navigation Satellite System (GLONASS), laser ranging, Very Long Baseline Interferometry (VLBI), and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) data. The specialized nature of the CDDIS lends itself well to enhancement to accommodate diverse data sets and user requirements. The CDDIS serves as one of the primary data centers for the following International Association of Geodesy (IAG) services:•International GPS Service (IGS)•International Laser Ranging Service (ILRS)•International VLBI Service for Geodesy and Astrometry (IVS) •International Earth Rotation Service (IERS)•International DORIS Service (IDS) Operational data centers deposit data to individual user accounts on the CDDIS host computer. All data are processed to ensure data integrity and to extract pertinent metadata. These metadata are loaded into a relational database for data tracking and query purposes. Data are then copied to public directories and made available to the user community through anonymous ftp and the web. The CDDIS is operational on a UNIX server with over 550 Gbytes of on-line disk storage. A majority of the archive is devoted to the archive of GPS data and products. In 2001, over 2.2 million files totaling over 150 Gbytes in size were downloaded each month from the CDDIS on-line archive. More than 6,700 distinct hosts in 95 countries accessed and downloaded data from the CDDIS last year. Over 120 institutions in over sixty countries supply data to the CDDIS on a daily basis for
DORIS on-board receiverIDS web site photograph
DORIS antenna located inHartebeesthoek, South Africa
IGN web site photograph
DORIS satellite antennaAVISIO web site photograph
IDS DATA AND PRODUCTSThe DORIS system, developed in France, is based on the measurement of Doppler shifts in radio signals, transmitted by ground beacons to a DORIS receiver on-board the satellite. Like GPS and SLR, precise satellite orbits, positions of and distances between observing stations, and Earth rotation, orientation, and polar motion values can be derived from DORIS measurements. The primary objective of the International DORIS Service (IDS) is to foster the DORIS technique to support international geodetic, geophysical, and other research and operational activities.
DORIS Data:•Files containing one "cycle" (~ten days) of data (computedrange measurements), sorted by satellite, in DORIS-specific format•Seven satellites have on-board DORIS receivers that receive transmitted signals from a network of nearly 50 beacons•Approximately 5 Mbyte/satellite/cycle (compressed) •CDDIS DORIS data archive: 1992 through present; all data available on-line
IDS Products (future):•Precise satellite ephemerides•Site coordinates and velocities; position time series•Earth rotation parameters•Special products-Ionosphere information-Time varying geocenter coordinates
Network Stations Continuously operational Timely flow of data
Data Centers Interface to network stations Perform QC and data conversion activities Archive data for access to analysis centers and users
Analysis Centers Provide products to users (e.g., station coordinates, precise satellite orbits, Earth orientation parameters, atmospheric products, etc.)
Central Bureau Management of service Facilitate communications Coordinate activities
Governing Body General oversight of service Future direction
DATA FLOW FOR INTERNATIONAL SERVICES
Space Geodesy Network Stations
GPS GLON SLR VLBI DORIS
Operational/Regional Data Centers
Analysis Centers/User Community
Global Data Centers
Compressed Data Files (in data type-specific formats)
Compressed Data Files (in data type-specific formats)
Raw Data
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CEN 05/17/2002
FOR FURTHER INFORMATIONCarey NollManager, CDDISNASA GSFCGreenbelt, MD [email protected]
Maurice DubeRaytheon ITSSLanham, MD [email protected]
CDDIS Web Site: http://cddis.nasa.gov or http://cddisa.gsfc.nasa.gov
IVS DATA AND PRODUCTSProducts generated by International VLBI Service for Geodesy and Astrometry (IVS) contribute to research in many areas, including solid Earth, tides, studies of the vertical, and VLBI technique improvement. The objectives of IVS are to provide a service to support geodetic, geophysical, and astrometric research and operational activities, to promote research and development for VLBI, and to interact with users of VLBI products
VLBI Data:•VLBI data bases in DBH and NGS card formats•Auxiliary files (e.g., log, met data, schedule, cable info, correlator notes, etc.)•Currently, over 40 antennas participate in the IVS•Approximately 2-3 Mbyte/data base file(compressed)•CDDIS VLBI data archive: 1979 through present; most data holdings available on-line
IVS Products:•Intensive and session Earth orientation parameter series (EOP-I and EOP-S)
VLBI antenna at Fairbanks, AKIVS web site photograph
Part of the celestial reference frame defined by VLBIIVS web site photograph
ILRS DATA AND PRODUCTSThe International Laser Ranging Service (ILRS), operational since 1998, provides global satellite and lunar laser ranging data and their related products to support geodetic and geophysical research
an accurate International Terrestrial Reference Frame (ITRF). The service develops the necessary global standards/specifications and encourages international adherence to its conventions. The ILRS collects, merges, archives and distributes Satellite Laser Ranging (SLR) and Lunar Laser Ranging (LLR) observation data sets of sufficient accuracy to satisfy the objectives of a wide range of scientific, engineering, and operational applications and experimentation.
Laser Data:• Daily and monthly files containing on-site normal points,
sorted by satellite, in ILRS normal point format• Hourly files containing on-site normal points from all
satellites, in ILRS normal point format retained for five days
• Daily and monthly full-rate data files from a subset of the global network, sorted by satellite, in ILRS full-rate format
• Currently, 26 satellites and four sites on the moon are tracked on a routine basis by 40 SLR and LLR stations
• Approximately 1 Mbyte/day on-site normal point data (uncompressed); 2 Mbytes/day full-rate data (compressed)
• CDDIS laser data archive: 1976 through present; approximately 90% of data holdings available on-line
ILRS Products (future):• Precise satellite ephemerides
Retroreflector array on Jason, GFO-1, ICEsat, and ADEOS-IIILRS web site photograph
LAGEOS satelliteILRS web site photograph
SLR 2000 prototype system at Greenbelt, MDILRS web site photograph
IGS DATA AND PRODUCTSThe main mission of the International GPS Service (IGS) is to provide a service to support geodetic and geophysical research activities through GPS data and products. This service has been operational since 1994. The current network consists of nearly 300 permanently occupied, globally distributed sites that provide GPS data to IGS data centers on a daily, hourly, and near-real-time basis. These GPS data are used by the IGS analysis centers to generate products such as precise satellite ephemerides and clock information.
GPS (and GLONASS) Data:•Daily files containing 30-second sampled GPS data in RINEX format-200+ GPS (and ~50 GLONASS) stations/day-Approximately 0.35 Mbytes/site/day in size (compressed)-Data since January 1997 on-line•Hourly files of 30-second sampled GPS data in RINEX format-115+ GPS (and 16 GPS/GLONASS) stations/day-Approximately 0.02 Mbytes/site/hour in size (compressed)-Data retained for three days•Fifteen-minute files of one-second sampled GPS data in RINEX format-40+ GPS stations/day-Approximately 0.45 Mbytes/site/hour in size (compressed)-Data since May 2001 on-line•Daily files of ten-second sampled satellite-borne GPS receive data in RINEX format-Two satellites (SAC-C, CHAMP); JASON, GRACE to be archived -Approximate 2.5 Mbytes/satellite/day in size (compressed)-Data since January 2002 on-line
IGS Products:•Precise GPS satellite ephemerides (<5 cm accuracy)•Earth rotation parameters •IGS tracking station coordinates and velocities •GPS satellite and IGS tracking station clock information• Global ionosphere maps of total electron content (TEC)
IGS
GPS satelliteSmithsonian Institution photograph
GODE GPS antenna at Greenbelt, MDCDDIS photograph
FAIR GPS antenna at Fairbanks, AKIGS photograph
CDDIS ARCHIVE STATISTICS
North AmericaSouth AmericaEuropeAsiaAfricaAustraliaPacific
Number of GPS, GLONASS, Laser, VLBI, and DORISFiles Retrieved in 2001
(By Geographic Area)
Number of GPS, GLONASS, Laser, VLBI, and DORISFiles Retrieved in 2001
(By Geographic Area)
57%
9%
29%
1%
4% <1%<1%
CommercialEducationGovernmentNetworkNon-ProfitUnknown
Number of GPS, GLONASS, Laser, VLBI, and DORIS Files Retrieved in 2001
(By Host Type)
Number of GPS, GLONASS, Laser, VLBI, and DORIS Files Retrieved in 2001
(By Host Type)
62%
11%
26%
1% <1%<1%
1
10
100
1,000
10,000
100,000
1,000,000
10,000,000
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Number of GPS, GLONASS, Laser Ranging, VLBI and DORIS Files Retrieved from the CDDIS(2001)
Number of GPS, GLONASS, Laser Ranging, VLBI and DORIS Files Retrieved from the CDDIS(2001)
GPS GLONASS Laser VLBI DORIS