1 hour filtered VTEC map format

Dimensions

Field name Description
longitude Number of grid points in longitude
latitude Number of grid points in latitude
nGridPoints Total number of grid points (longitude x latitude)
epoch Number of epochs (24)
epochOrig Number of original epochs (2880 if 30 s time sampling)
length Length of the epoch field (8 chars)
length2 Length of the station name field (4 chars)
nSatellites Number of satellites considered
nStations Number of stations considered

Variables

Field name Description Unit Dimension Number of elements Element coding
epochOrig Epoch of each original VTEC map Hours:minutes:seconds 1 epochOrig 8 chars
epoch Epoch of each filtered VTEC map Hours:minutes:seconds 1 epoch 8 chars
longitude Longitude of the grid points Degrees 1 longitude Float
latitude Latitude of the grid points Degrees 1 latitude Float
satellite List of the satellite identifiers - 1 nSatellites Short
station List of the station names - 1 nStations 4 chars
observations Matrix of the observation pairs between satellites and stations 0: no observation
1: observation		 3 epoch x nStations x nSatellites Byte
vtec Interpolated VTEC at the grid points TECU 3 epoch x latitude x longitude Float
sigma Uncertainty on the interpolated VTEC TECU 3 epoch x latitude x longitude 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 filtered VTEC map can be seen here.

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