Hello,
Could you provide detailed guidance including examples, on how to calculate TECu from realtime GNSS CSV files? I have no idea how to proceed and greatly need assistance with step-by-step instructions.
Thanks in advance.
https://cddis.nasa.gov/archive/gnss/products/realtime/jpl_ionosphere/2024/
sample data :
GPSSoD, UTCTime, sat, ipplat, ipplon, atec, stec, dataflag
49555, 240504134537, C005I, 32.76959, 46.34834, -100.60362, 0.075012238,0
49560, 240504134542, C005I, 32.7717, 46.34699, -100.642869, 0.071028156,0
...
Realtime GNSS TEC
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CDDIS_support_Rebecca
- User Services
- Posts: 2
- Joined: Thu Oct 10, 2019 10:40 am America/New_York
-
CDDIS_support_Rebecca
- User Services
- Posts: 2
- Joined: Thu Oct 10, 2019 10:40 am America/New_York
Re: Realtime GNSS TEC
The creator of these files shared the following information. Please let us know if you need further assistance.
File Format: CSV. Fields and corresponding description:
- GPSSoD the GPS seconds of day (i.e., seconds since midnight on the day of the file)
- UTCTime the UTC time in YYmmDDHHMMSS format (taking UTC leap seconds into account; with YY the 2-digit year, mm the 2-digit month, DD the 2-digit day, HH the 2-digit hours, MM the 2-digit minutes, and SS the 2-digit seconds
- sat the satellite Space Vehicle Number (SVN)
- ipplat the latitude of the ionospheric pierce point (IPP) for the link between the site (<SITE> of the corresponding file) and the satellite (sat field)
- ipplon the longitude of the ionospheric pierce point (IPP) for the link between the site (<SITE> of the corresponding file) and the satellite (sat field)
- atec absolute (uncalibrated and unfiltered) slant TEC (Total Electron Content) along the line of sight between the site (<SITE> of the corresponding file) and the satellite (sat field)
- stec filtered (high-pass with a 15-min cut-off period) TEC (Total Electron Content) along the line of sight between the site (<SITE> of the corresponding file) and the satellite (sat field)
- dataflag informative flag about this particular data point: - 0 = nothing to report - 5 = interpolated data point, due to a data gap - 1X, 3X = a cycle slip was detected but not corrected; with: X = 1 or 2 if slip detected on carrier phase 1 or 2 (respectively), X = 3 if detected on both carrier phases - 2X, 4X = a cycle slip was detected and a correction was attempted; with: X = 1 or 2 if slip detected on carrier phase 1 or 2 (respectively), X = 3 if detected on both carrier phases
Format Link: https://datatracker.ietf.org/doc/html/rfc4180 (CSV)
File Format: CSV. Fields and corresponding description:
- GPSSoD the GPS seconds of day (i.e., seconds since midnight on the day of the file)
- UTCTime the UTC time in YYmmDDHHMMSS format (taking UTC leap seconds into account; with YY the 2-digit year, mm the 2-digit month, DD the 2-digit day, HH the 2-digit hours, MM the 2-digit minutes, and SS the 2-digit seconds
- sat the satellite Space Vehicle Number (SVN)
- ipplat the latitude of the ionospheric pierce point (IPP) for the link between the site (<SITE> of the corresponding file) and the satellite (sat field)
- ipplon the longitude of the ionospheric pierce point (IPP) for the link between the site (<SITE> of the corresponding file) and the satellite (sat field)
- atec absolute (uncalibrated and unfiltered) slant TEC (Total Electron Content) along the line of sight between the site (<SITE> of the corresponding file) and the satellite (sat field)
- stec filtered (high-pass with a 15-min cut-off period) TEC (Total Electron Content) along the line of sight between the site (<SITE> of the corresponding file) and the satellite (sat field)
- dataflag informative flag about this particular data point: - 0 = nothing to report - 5 = interpolated data point, due to a data gap - 1X, 3X = a cycle slip was detected but not corrected; with: X = 1 or 2 if slip detected on carrier phase 1 or 2 (respectively), X = 3 if detected on both carrier phases - 2X, 4X = a cycle slip was detected and a correction was attempted; with: X = 1 or 2 if slip detected on carrier phase 1 or 2 (respectively), X = 3 if detected on both carrier phases
Format Link: https://datatracker.ietf.org/doc/html/rfc4180 (CSV)
Re: Realtime GNSS TEC
Dear Rebecca,
Thank you, but unfortunately that's not the answer I'm looking for. I have sent you an email with the details of my query.
I would appreciate it if you could redirect my question to the relevant individuals after checking, please.
Thank you, but unfortunately that's not the answer I'm looking for. I have sent you an email with the details of my query.
I would appreciate it if you could redirect my question to the relevant individuals after checking, please.