Raw product format

Dimensions

Field name	Description
nData	Number of data (i.e. observations) contained in the file (unlimited)
nEpochs	Number of epochs per day (2880 if 30 s time sampling)
nSatellites	Number of satellites considered
nStations	Number of stations considered
length	Length of the epoch field (8 chars)
length2	Length of the station name field (4 chars)
position	Dimensions of a position field (3)

Variables

Field name	Description	Unit	Dimension	Number of elements	Element coding
satList	List of the satellite identifiers	-	1	nSatellites	Short
staList	List of the station acronyms	-	1	nStations	4 chars
satPosition	Positions (x, y, and z in WGS 84) of all the satellites at each GPS measurement instant (aka epoch)	Metres, metres, metres	2	nEpochs x nSatellites	3 floats
staPosition	Positions (longitude, latitude, and altitude) of the stations (assumed fixed)	Degrees, degrees, degrees	1	nStations	3 floats
TGD	TGD of each satellite, at each epoch	TECU	2	nEpochs x nSatellites	Float
sigmaTGD	Uncertainty on the TGD of each satellite, at each epoch	TECU	2	nEpochs x nSatellites	Float
IFB	IFB of each station, at each epoch	TECU	2	nEpochs x nStations	Float
sigmaIFB	Uncertainty on the IFB of each station, at each epoch	TECU	2	nEpochs x nStations	Float
epochData	Epoch at each observation	Hours:minutes:seconds	1	nData	8 chars
satData	Satellite identifier at each observation	-	1	nData	Short
staData	Station name at each observation	-	1	nData	4 chars
lonData	Longitude of SIP at each observation	Degrees	1	nData	Float
latData	Latitude of SIP at each observation	Degrees	1	nData	Float
STECData	STEC at SIP for each observation	TECU	1	nData	Float
fobData	Obliquity factor at each observation	-	1	nData	Float

Global attributes

Field name	Description
algorithm_version	Version number of the algorithm used for the map creation
reference_station	Name of the station taken as reference (bias fixed to 0)
ionosphere_altitude	Altitude of the ionosphere in metres

Example

A netCDF header of a raw product can be seen here.

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