GPS

Which GPS stations?

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Below is a list of the GNSS data providers ordered by country. For each provider, it gives the acronym of the associated GNSS stations. Note that the work is under progress to have a complete list. However, do not hesitate to contact us to keep it updated.
E-mail: sonel@sonel.org

COUNTRY (67)     PROVIDER (196) ACRONYM GNSS stations (885)    
National Oceanic and Atmospheric Administration NOAA  (1)
Collectivité Territoriale de Martinique CTM
ARG Instituto Geografica Nacional de la Republica Argentina IGNRA  (11)
ARG Instituto Nacional de Prevención Sísmica INPRES  (1)
ARG Estacion Astronomica Rio Grande EARG  (3)
AUS Geoscience Australia GA  (46)
AUS Department of Environment & Primary Industries DEPI  (3)
AUS LANDGATE LANDGATE  (5)
AUS Department Infrastructure, Planning & Logistics DIPL  (2)
AUS IPS Radio and Space Services - Australia Bureau of Meteorology IPS  (1)
AUS Australian Surveying & Land Information Group AUSLIG  (1)
AUS Curtin University Curtin University  (1)
BEL Royal Observatory of Belgium ROB  (1)
BEN Institut Geographique National du Benin IGN-BJ  (1)
BOL INSTITUTO GEOGRAFICO MILITAR DE BOLIVIA IGM-Bo  (1)
BRA Instituto Brasileiro de Geografia e Estatística IBGE  (29)
BRA Instituto Nacional de Pesquisas Espaciais INPE  (1)
BRB Coastal Zone Management Unit CZMU  (2)
CAN National Resources Canada NRCan  (29)
CAN Geological Survey of Canada GSC  (5)
CAN SERVICE NOVA SCOTIA SNS  (4)
CAN Dept. Internal Services ISD  (1)
CHE Swiss Federal Office of Topography SWISSTOPO  (1)
CHL Departamento de Geofísica, Centro Sismologico Nacional, Univ. de Chile DGF - CSN  (1)
CHL Center for Space Studies CEC  (2)
CHL Universidad de Concepcion UdeC  (1)
COL Instituto Geografico Agustin Codazzi IGAC  (5)
COL Servicio Geologico Colombiano SGC  (1)
CPV Instituto Nacional de Meteorologia e Geofisica INMG  (1)
CYM Cayman Land Info CAYMAN  (1)
DEU Deutsches GeoForschungsZentrum GFZ  (21)
DEU Bundesanstalt für Gewässerkunde BAFG  (16)
DEU Deutsches Geodätisches Forschungsinstitut DGFI  (2)
DEU Bundesamt für Kartographie und Geodäsie BKG  (21)
DNK DTU Space National Space Institute DTU-Space  (13)
DNK Danish Geodata Agency GST  (1)
DOM Universidad Nacional Pedro Henriquez Ureña UNPHU  (3)
ECU Instituto Geografico Militar Ecuador IGM_EC  (2)
EGY Centre d'Etudes Alexandrines CEAlex  (2)
ESP Instituto Geografico Nacional IGNE  (29)
ESP Puertos del Estado PDE  (3)
ESP Instituto Espanol de Oceanografia IEO  (1)
ESP Canary GNSS Centre CGC  (8)
ESP Instituto de Estadística y Cartografía de Andalucía IECA  (6)
ESP Junta de Castilla y Leon ITACYL  (1)
ESP Gipuzkoako Foru Aldundia GFA  (1)
ESP Geodetic Department Universtidad de Cantabria UC  (2)
ESP Department of Applied Geodesy - Aranzadi Society of Sciences ADAG  (1)
EST Estonian Land Board ELB  (15)
FIN Finnish Geospatial Research Institute, National Land Survey of Finland FGI-NLS  (7)
FRA Institut Géographique National IGN  (31)
FRA Service Hydrographique et Océanographique de la Marine SHOM  (7)
FRA Laboratoire d'Etudes en Geophysique et Oceanographie Spatiale LEGOS  (5)
FRA Direction des Infrastructures, de la Topographie et des Transports Terrestres DITTT  (5)
FRA Institut polaire français Paul Emile Victor IPEV  (2)
FRA Port Autonome de Nantes - Saint-Nazaire PANSN  (1)
FRA Laboratoire de Géologie de l’Ecole normale supérieure GEOL ENS  (3)
FRA Institut de Physique du Globe de Paris IPGP  (3)
FRA Centre National d"Etudes Spatiales CNES  (19)
FRA Centre d'Etudes Techniques Maritimes et Fluviales CETMEF  (7)
FRA Réseau National GPS permanent RENAG  (1)
FRA ORPHEON ORPHEON  (3)
FRA SONEL-LIENSs SONEL  (15)
FRA Centre National de la Recherche Scientifique CNRS  (17)
FRA ACTIPLAN SARL ACTIPLAN  (3)
FRA Grand Port Maritime du Havre HAROPA  (1)
FRA Communauté Urbaine de Dunkerque CUD  (1)
FRA Ville de Cannes - Direction des systèmes d'information Géographique Ville de Cannes  (3)
FRA Collectivité de Saint-Martin COM SAINT MARTIN  (1)
FRA SATINFO Réseau GNSS SAT-INFO  (5)
FRA TERIA TERIA  (21)
FRA GIE Coop&Tech - Réseau RTK - Groupement de Cooperatives Agricoles GIE Coop&Tech  (3)
FRA Ville de Nice Ville de Nice  (1)
FRA Institut Francais pour la Recherche en Terres Polaires IFRTP  (1)
FRA Ecole Normale Superieure / CNRS - Laboratoire de Geologie ENS-GEOLOLOGIE  (1)
FRA IPG - Observatoire volcanologique du Piton de la Fournaise IPG  (1)
FRA DTAM - Phares et Balises DTAM  (1)
FRA Geosciences Montepllier GNSS_OREME team  (1)
FRA Météo France MF  (1)
GBR NERC British Isles continuous GNSS Facility BIGF  (16)
GBR Bermuda Institute of Ocean Science BIOS  (1)
GBR European Space Agency ESA  (1)
GHA Ghana Meteorological Agency GMA  (1)
GRC DEPARTMENT of GEODESY & SURVEYING DGS  (1)
GRC National Technical University of Athens NTUA  (1)
GRC Hellenic National Tsunami Warning Centre HL-NTWC  (1)
GUY Service des Phares et Balises de Guyane DM-GUYANE  (1)
HKG Lands Department - Hong-Kong LD-HK  (9)
HRV Hydrographic Institute of the Republic of Croatia HHI  (1)
HRV State Geodetic Administration SGA  (4)
IDN National Coordination Agency for Surveys and Mapping BAKOSURTANAL  (2)
IRL Ordnance Survey Ireland OSI  (2)
IRN National Cartographic Center of I.R.IRAN NCC  (1)
ISR Survey of Israel (SOI) SOI  (2)
ITA Istituto Superiore per la Protezione e la Ricerca Ambientale ISPRA/ID
ITA Università degli Studi di Ferrara UNIFE  (1)
ITA Istituto Nazionale di Geofisica e Volcanologia INGV  (5)
ITA Agenzia Spaziale Italiana ASI  (6)
ITA Consiglio Nazionale delle Ricerche - Istituto di Scienze Marine CNR- ISMAR  (3)
ITA Regione Campania RC  (1)
ITA Cooperativa San Martino COOPSM  (1)
ITA Regione Abruzzo RAbruzzo  (1)
ITA e-geos S.p.A. - una societa ASI/Telespazio TPZ  (1)
ITA INAF ASTRONOMICAL OBSERVATORY OF CAGLIARI CAO  (1)
ITA Universita' di Cagliari - Dip. Ingegneria Strutturale - Sez. Topografia DISIG-Cagliari  (1)
JPN Geospatial Information Authority of Japan GSI  (43)
JPN Electronic Navigation Research Institute ENRI  (1)
JPN Space-Time Standards Laboratory ; National Institute of Information and Communications Technology NICT  (1)
KOR National Geographic Information Institute NGII  (1)
KOR Korea Astronomy and Space Science Institute KASI  (3)
KOR Korea Hydrographic and Oceanographic Administration KHOA  (8)
LKA Surveyor General's Office Colombo SGOC  (1)
LTU Geodetic Institute of Vilnius TU VGTU GI  (1)
LUX University of Luxembourg UL  (4)
LVA Latvijas Geotelpiskas Informacijas Agentura LGIA_LatPOS  (2)
MDG Institute Observatory of Geophysics of Antananarivo IOGA  (1)
MDV Gan Meteorological Office GANMET  (1)
MEX Instituto de Geofísica - Servicio Mareográfico Nacional - UNAM SMN-UNAM  (15)
MEX Instituto Nacional de Estadística y Geografía INEGI  (10)
MEX Instituto Municipal de Investigación y Planeación de Ensenada IMIP  (1)
MYS Department of Survey and Mapping Malaysia JUPEM  (6)
NAM Directorate of Survey and Mapping Namibia DSM-NAM  (1)
NLD Delft University of Technology TUDELFT  (7)
NOR Norwegian Mapping Authority - Kartverket NMA  (13)
NZL GNS Science GNS  (8)
NZL Land Information New Zealand LINZ  (13)
NZL University of Otago uOtago  (2)
OMN Petroleum Development Oman PDO  (1)
PAN Instituto Geografico Nacional Tommy Guardia IGNTG  (1)
PER Instituto geografico del peru IGN PERU  (2)
PHL National Mapping and Resource Information Authority NAMRIA  (3)
PHL Naval Forces West NFW  (1)
PHL Mindanao State University MSU  (1)
POL ASG-EUPOS ASG-EUPOS  (2)
POL Space Research Centre of the Polish Academy of Sciences SRC-PAS  (1)
PRT Space & Earth Geodetic Analysis Laboratory SEGAL  (3)
PRT Direccao de Servicos de Cartografia e Informacao Geografica DSCIG  (1)
PRT Direcao-Geral do Territorio DGT  (2)
PYF Université de la Polynesie francaise UPF  (8)
RUS SmartNet Russia SMARTNET  (1)
RUS Research Station of RAS RS-RAS  (10)
RUS Trofimuk Institute of Petroleum Geology and Geophysics IPGG SB-RAS  (1)
RUS Geophysical Observatory Arti ARS  (1)
RUS Institute of Astronomy, Russian Academy of Sciences INASAN  (1)
SEN Universite Cheikh Anta Diop UCAD  (1)
SEN Direction des Travaux Geographiques et Cartographiques ANAT/DTGC  (1)
SGP Nanyang Technological University NTU  (1)
SGP Singapore Land Authority SLA  (5)
SLV Centro Nacional de Registros CNR  (1)
SVN Geodetic Institute of Slovenia GIS  (2)
SVN Surveying and Mapping Authority of the Republic of Slovenia SMARS  (1)
SWE Swedish Meteorological and Hydrological Institute SMHI  (1)
SWE SWEPOS-LANTMÄTERIET SWEPOS-LMV  (44)
TWN National Measurement Laboratory ; Industrial Technology Research Institute NML - ITRI  (2)
TWN National Standard Time and Frequency Telecommunication Laboratories, Chunghwa TL  (1)
TZA Tanzania Ports Authority TPA  (1)
UKR Crimean Astrophysical Observatory CRAO  (1)
URY Servicio geographico militar SGM  (2)
USA National Geodetic Survey NGS  (14)
USA University of Hawai'i Sea Level Centre UHSLC  (3)
USA UNAVCO UNAVCO  (11)
USA US Geological Survey USGS  (9)
USA University of California - Berkeley Seismological Laboratory UC-BSL  (5)
USA U.S. Naval Observatory USNO  (6)
USA U.S. Coast guard USCG  (29)
USA Jet Propulsion Laboratory JPL  (54)
USA National Radio Astronomy Observatory NRAO  (5)
USA University of the Virgin Islands UVI  (2)
USA Louisiana State University - Center for GeoInformatics LSU-C4G  (4)
USA North Carolina Geodetic Survey NCGS  (5)
USA BP BP - BPEXAK  (1)
USA Plate Boundary Observatory - EarthScope PBO  (4)
USA Connecticut Department of Transportation CT-CONDOT  (1)
USA SmartNet North America SMRTNT  (8)
USA Alabama Department of Transportation - Alabama Great Seal ALDOT  (2)
USA Texas Department of Transportation TxDOT  (3)
USA Federal Aviation Administration FAA  (3)
USA University of Maryland, Baltimore County UMBC  (1)
USA Washington State Reference Network WSRN  (4)
USA NYS Spacial Reference Network NYSDOT  (1)
USA National Geospatial-Intelligence Agency NGA  (8)
USA COLLEGE OF THE ATLANTIC, GIS LABORATORY COA  (1)
USA CICESE Laboratorio del Nivel del Mar CICESE  (1)
USA Massachusetts Department of Transportation MassDOT  (1)
USA University of Maine at Machias UMM  (1)
USA Maine Department of Transportation MaineDOT  (1)
USA UNITED STATES AIR FORCE USAF  (1)
USA Virginia Department of Transportation VDOT  (1)
USA Loyola Spatial Systems LOYSS  (1)
USA Scripps Orbit and Permanent Array Center SOPAC  (1)
USA State of Alaska, Department of Transportation Central Region Survey Section AK-DOT  (2)
USA Pacific GPS Facility - Hawaii Institute of Geophysics and Planetology - University of Hawaii at Manoa PGF  (15)
VEN Centro de Procesamiento y Analisis GNSS SIRGAS de LUZ CPAGS-LUZ  (1)
ZAF The Hartebeesthoek Radio Astronomy Observatory HartRAO  (4)
ZAF National Geo-Spatial Information NGI  (7)
ZAF South African National Space Agency SANSA  (1)

The GPS observations that we provide are in the form of daily 30s files (24h of observations at 30s intervals) in the standard international RINEX format. Further information on the RINEX files.

Apart from the RINEX observation files of the GPS stations, SONEL provides ancillary information which enables a precise analysis of the GPS measurements, in particular :
- the precise orbits of IGS,
- the Earth orientation parameters of IGS.


Evolution of the number of Rinex files available on SONEL (per DOY) since 1991-079






Number of stations whose record length reaches x (years) value.






Cumulative number of stations whose record length is x years or longer.



The GPS observations are published on the anonymous FTP server of SONEL (ftp.sonel.org). The conditions of access are that the origin of the data is acknowledged in all communications, oral or written. Further details.

The FileZilla tool is a free client ftp which allows you to access the data.

JPEG - 177.2 kb
Updated from Wöppelmann et al. (2009) using ULR5 solution

- The processing of GPS observations is particularly complex for the calculation of vertical movements of the land on which the tide gauges are placed (movements of the order of mm/year). The article published in 2007 by the members of the consortium of the ‘ULR’ GPS analysis centre describes the difficulties and the challenges raised by this issue. The figure opposite illustrates the challenges : shown on the left is a series of average sea levels measured with tide gauges ; in the middle the series are corrected with the predictions of the de postglacial rebound model ICE5G (VM2); on the right with the GPS velocities obtained by the ‘ULR’ centre in ITRF2008.

JPEG - 941.4 kb
Cluster Ymir (ULR)

- To meet this challenge SONEL relies on the ULR analysis centre whose computation facilitiy is situated at the University of La Rochelle. The cluster acquired in 2008 reduced significantly the calculation time, from 1 year down to 2-3 weeks to process 10 years of GPS observations from a global network of some 200 stations. This has opened up new perspectives of experimentation and important avenues of research (new strategies, modeling, corrections). In particular, it enabled the ULR group to collaborate with 9 of the most prestigious groups in the spatial field in the first reprocessing campaign of the international service IGS.

- The latest ULR solution published in Global and Planetary Change is available in SONEL as time series of daily positions and velocities. Click on the link below to obtain more details and retrieve the results.

- The members of the ULR consortium

This page enumerates the last events that occured concerning the data recovering in SONEL. Here are the significations of the different event types:

-New sitelog: a new site log has been recovered within the last 4 weeks.
-New GNSS: a new GNSS station has been included in SONEL within the last 2 months.
-New data: large amount of RINEX files has been downloaded within the last month, out of the daily process.

EVENT DATE     EVENT TYPE     ACRONYM     COMMENT    
2020-03-27 New data N300 259 Rinex2 files between 2019-182 and 2020-078
2020-03-27 New GNSS N300 2m from tide gauge MIAMI BEACH
2020-03-27 New data HNLC 84 Rinex2 files between 2013-017 and 2020-078
2020-03-27 New data VACS 50 Rinex2 files between 2013-150 and 2020-078
2020-03-25 New sitelog BARA bara_20200323.log
2020-03-25 New sitelog SCTB sctb_20200323.log
2020-03-25 New sitelog P365 p365_20200323.log
2020-03-25 New sitelog HYDE hyde_20200319.log
2020-03-25 New sitelog MAL2 mal2_20200319.log
2020-03-25 New sitelog ANTC antc_20200318.log
2020-03-25 New sitelog SGOC sgoc_20200318.log
2020-03-25 New sitelog LIP3 lip3_20200228.log
2020-03-25 New sitelog MQZG mqzg_20200323.log
2020-03-25 New sitelog LIPJ lipj_20200120.log
2020-03-25 New sitelog SBRB sbrb_20200323.log
2020-03-24 New data SAMA 78 Rinex2 files between 2020-001 and 2020-078
2020-03-24 New data STJ3 93 Rinex2 files between 2019-349 and 2020-078
2020-03-24 New data GAMB 95 Rinex2 files between 2019-349 and 2020-078
2020-03-24 New data CUCU 78 Rinex2 files between 2020-001 and 2020-078
2020-03-24 New data CART 78 Rinex2 files between 2020-001 and 2020-078
2020-03-24 New data BUEN 78 Rinex2 files between 2020-001 and 2020-078
2020-03-20 New data ALBY 85 Rinex2 files between 2019-359 and 2020-078
2020-03-20 New data GUIP 51 Rinex2 files between 2020-028 and 2020-078
2020-03-20 New data GUIP 51 Rinex3 files between 2020-028 and 2020-078
2020-03-20 New data ALBY 77 Rinex3 files between 2020-002 and 2020-078
2020-03-20 New data BJCO 51 Rinex2 files between 2019-365 and 2020-075
2020-03-20 New data HKQT 96 Rinex2 files between 2019-319 and 2020-078
2020-03-20 New data LASP 87 Rinex2 files between 2019-302 and 2020-078
2020-03-20 New data VITH 65 Rinex2 files between 2020-014 and 2020-078
2020-03-20 New data VIKH 32 Rinex2 files between 2020-016 and 2020-078
2020-03-20 New data LZ02 65 Rinex2 files between 2020-006 and 2020-070
2020-03-20 New data TNPP 143 Rinex2 files between 2019-301 and 2020-078
2020-03-20 New data TGLE 96 Rinex2 files between 2019-347 and 2020-077
2020-03-20 New data TBON 78 Rinex2 files between 2020-001 and 2020-078
2020-03-20 New data PTKL 92 Rinex2 files between 2019-349 and 2020-078
2020-03-20 New data LZ02 56 Rinex3 files between 2020-015 and 2020-070
2020-03-19 New data MAL1 86 Rinex3 files between 2016-237 and 2016-322
2020-03-19 New GNSS LIP3 No data available, GNSS is 2330m from tide gauge LIEPAJA
2020-03-18 New sitelog HIL1 hil1_20200318.log
2020-03-18 New data MANB 58 Rinex2 files between 2019-219 and 2019-291
2020-03-18 New sitelog PARC parc_20200317.log
2020-03-18 New sitelog PARK park_20200316.log
2020-03-18 New sitelog NCDU ncdu_20200316.log
2020-03-18 New sitelog HOLB holb_20200312.log
2020-03-18 New data MABE 44 Rinex2 files between 2019-287 and 2019-360
2020-03-18 New sitelog ARHT arht_20200312.log
2020-03-18 New sitelog RHPT rhpt_20200312.log
2020-03-18 New sitelog CHIN chin_20200312.log
2020-03-18 New sitelog WGTT wgtt_20200304.log
2020-03-18 New sitelog GUAM guam_20200312.log
2020-03-17 New data AJAC 31 Rinex2 files between 2020-048 and 2020-078
2020-03-17 New GNSS PMZI No data available, GNSS is 2608m from tide gauge DZAOUDZI
2020-03-17 New data AJAC 31 Rinex3 files between 2020-048 and 2020-078
2020-03-17 New GNSS MABE 139m from tide gauge NOSY-BE II
2020-03-17 New GNSS MANB 139m from tide gauge MANILA
2020-03-12 New data IBIZ 96 Rinex3 files between 2016-239 and 2020-078
2020-03-11 New sitelog WOOL wool_20200311.log
2020-03-11 New sitelog ALBY alby_20200302.log
2020-03-11 New sitelog AKSE akse_20200303.log
2020-03-11 New sitelog CPVG cpvg_20200305.log
2020-03-11 New sitelog PBRI pbri_20200306.log
2020-03-11 New sitelog SOLO solo_20200306.log
2020-03-11 New sitelog COCO coco_20200310.log
2020-03-11 New sitelog AMER amer_20200303.log
2020-03-04 New sitelog POHN pohn_20200302.log
2020-03-04 New sitelog GMSD gmsd_20200227.log
2020-03-04 New sitelog RHPT rhpt_20200302.log
2020-03-04 New sitelog DAV1 dav1_20200302.log
2020-03-04 New sitelog HOB2 hob2_20200302.log
2020-03-04 New sitelog BUR2 bur2_20200302.log
2020-03-04 New sitelog MAW1 maw1_20200302.log
2020-03-04 New sitelog TOW2 tow2_20200302.log
2020-03-04 New sitelog SGOC sgoc_20200227.log
2020-03-04 New sitelog SYOG syog_20200226.log
2020-03-04 New sitelog MAC1 mac1_20200302.log
2020-03-04 New sitelog DJIG djig_20200226.log
2020-03-04 New sitelog CZTG cztg_20200226.log
2020-03-04 New sitelog MANA mana_20200221.log
2020-03-04 New sitelog MANA mana_20200221.log
2020-03-04 New sitelog WUHN wuhn_20191209.log
2020-03-04 New sitelog SELE sele_20181017.log
2020-03-04 New sitelog TCMS tcms_20180823.log
2020-03-04 New sitelog LKYA lkya_20200302.log
2020-03-04 New sitelog RBAY rbay_20180823.log
2020-03-04 New sitelog YAR3 yar3_20200302.log
2020-03-04 New sitelog NIUM nium_20200303.log
2020-03-04 New sitelog LAUT laut_20200304.log
2020-03-04 New sitelog KIRI kiri_20200303.log
2020-03-04 New sitelog PTVL ptvl_20200303.log
2020-03-04 New sitelog PNGM pngm_20200303.log
2020-03-04 New sitelog PTVL ptvl_20200303.log
2020-03-04 New sitelog LORD lord_20200302.log
2020-03-04 New sitelog PTHL pthl_20200302.log
2020-03-03 New data VALE 104 Rinex3 files between 2016-236 and 2020-078
2020-03-03 New data XIXO 142 Rinex3 files between 2016-197 and 2020-078
2020-03-03 New data ALBO 45 Rinex2 files between 2016-291 and 2020-077
2020-03-03 New data ALME 49 Rinex3 files between 2016-239 and 2020-078
2020-03-03 New data ALAC 103 Rinex3 files between 2016-236 and 2020-078
2020-03-03 New data MALA 104 Rinex3 files between 2016-235 and 2020-078
2020-03-03 New data FUER 105 Rinex3 files between 2016-235 and 2020-078
2020-03-03 New data FRRL 103 Rinex3 files between 2016-237 and 2020-078
2020-03-03 New data ACOR 42 Rinex3 files between 2016-239 and 2020-078
2020-03-03 New data CARG 91 Rinex3 files between 2016-250 and 2020-078
2020-03-03 New data CANT 105 Rinex3 files between 2016-236 and 2020-078
2020-03-03 New data ALBO 46 Rinex3 files between 2016-291 and 2020-077
2020-03-03 New data BCLN 104 Rinex3 files between 2016-236 and 2020-078
2020-01-31 New GNSS CYNE 10275m from tide gauge DEGRAD DES CANNES (CAYENNE)

Survey on Continuous GPS and Tide Gauge co-locations (CGPS@TG)

PNG - 34 kb
Survey results table

In order to get a better idea of the status and opportunities on continuous GPS positioning of tide gauges, a survey is carried out periodically within various geoscience communities. The survey aims to identify the existing permanent GPS stations which are close to tide gauges (up to approximately 10-15 km).



- The survey results can be viewed in conjunction with SONEL data holdings on the map (above). Purple symbols correspond to stations for which there are no observations in SONEL yet.

- By clicking on the table icon an on-line updated view of the CGPS@TG information that has been supplied to us is displayed. The table can be sorted by clicking on the column items, and a version of the view (table) can be downloaded in a format compatible with applications like excel (.csv).

PNG - 16.9 kb
Survey results on .kmz file

- A ’.kmz’ file provides a Google Earth view of the CGPS@TG geographical distribution. The cgpstg.kmz file is consistent with the above mentionned table (updated weekly). Clicking on a station symbol provides ancillary information on the station, and further clicking on the station name provides access to the so-called GPS sitelog (if the GPS data are available). The CGPS@TG ’kmz’ view might be useful in conjunction with the ’.kmz’ files of satellite radar altimetry ground tracks provided by CLS, or with the ’.kmz’ file of tide gauge records provided by the PSMSL.

- In addition to the periodic surveys, information on CGPS@TG co-locations can also be supplied to us any time by filling in this form. Thank you in advance for your collaboration.

- The sitelog generation tool can help you generate a sitelog file for your station, suitable with IGS requirements.