Data

The National Observatory of Athens (NOA) archives and distributes GPS/GNSS data for a large number of stations in Greece. These include (but are not limited to) the stations installed and maintained by NOA. A number of institutions, make their data freely available via NOA's repositories.

Institute Department Abbreviation
Academy of Athens Research Centre for Atmospheric Physics and Climatology AoA
National Technical University of Athens Dionysos Satellite Observatory DSO
Geodetic Observatory Pecny Research Institute of Geodesy, Topography and Cartography GOP
Istituto Nazionale di Geofisica e Vulcanologia INGV
Technological Educational Institute of Crete Department of Environmental and Natural Resources Engineering TEIC
University of West Attica Laboratory of Geodesy, Surveying & GNSS UNIWA
University of Patras Department of Geology UPATRAS

Data Access

Currently, we offer three different ways of accessing NOA's archived data. Users can make their pick depending on their needs and preferences.

Web Archive

Users can use NOA's web service to access and download data. The repository is organized in yearly and daily folders (actually day of year), conforming to the globally used conventions in the GPS/GNSS community.

GLASS

Geodetic Linking Advanced Software System (GLASS) is an integrated software package deployed in a GNSS infrastructure to manage data and metadata. GLASS is an open source platform, developed by EPOS GNSS Data and Products team, under Creative Commons licensing. For detailed information on GLASS, see EPOS's dedicated webpage.

Data Description

Within the data repositories, users will find daily RINEX files, most of which follow the long file naming convention: 

ssss00CCC_S_YYYYDDDHHMM_PPU_FFU_CT.fmt.cmp where: 
ssss = 4 character station ID 
CCC = ISO country code (GRC) 
S = Data source: "R" = receiver; "S" = stream; "U" = unknown 
YYYY = 4 digit year 
DDD = 3 digit day of year 
HH = 2 digit hour 
MM = 2 digit minute 
PP = 2 digit file period 
U = Units of file period PP: "M" = min; "H" = hour, "D" = day; "Y" = years
FF = 2 digit frequency of the observations 
U = Units of frequency of the observations FF: "S" = sec; "M" = min; "H" = hour 
C = Constellation indicator. "M" = mixed; "G" = GPS; "E" = Galileo; "R" = GLONASS; "C" = Beidou 
T = Data type indicator. "O" = observations; "N" = navigation
fmt = File format indicator. "rnx" = RINEX; "crx" = Hatanaka compacted RINEX 
cmp = Compression method (e.g. "zip", "gz")
A small number of RINEX files follow the short file naming convention: 
nnnnDDD0.YYt.cmp where: 
nnnn = 4 character station ID 
DDD = 3 digit day of year 
YY = 2 digit year 
t = File contents indicator. "o" = observations; "d" = Hatanaka compressed observations
cmp = Compression method (e.g. "zip", "gz")

NOA archives daily RINEX files, with a sampling interval of 30 seconds. Users that are in need of data in other formats, or sampling intervals are encouraged to contact NOA GNSS Team.

Metadata (Log files)

IGS-format site logs are kept for all stations in NOANET and updated regularly. Users can view or download them, at each station's individual weg-page (e.g. for station noa1).

Citation of NOANET data and metadata

Use of any NOANET data and metadata should be accompanied by the following citations:

Please also note that usage of ZNTE, STRF, KTHA, ANKY and PTKG data should be accompanied, in addition to the aforementioned, by the following citation:

.