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Supporting Data
GRAS SAF NRT and off-line sounding data products also include the following supporting parameters:
- LEO and occulting GPS satellite identifiers
- Horizontal location (latitude, longitude)
- Vertical location (ellipsoidal height, height above msl, geopotential height, pressure level)
- Date and time
- Quality information
- Precise Orbit Determination (POD) information
- Impact parameter (smoothed & sampled)
- Bending angle (smoothed & sampled)
- Other level 1b parameters
- Other parameters
| Heights |
| Quantity | Values | Remarks Remarks |
| Units | metres (m) | a. Ellipsoidal heights (referenced to WGS-84)b. Heights above msl (referenced to geoid EGM96)c. geopotential heights (referenced to geoid EGM96) |
| Domain | 0-50 km (NRT)0-80 km (Off-line) | Surface to 1 hPaSurface to 0.01 hPa |
| Range | 0-80,000 m |
| Precision | 1 m |
| Vertical sampling | 0.5 km |
| Accuracy | 20 m (NRT)10 m (Off-line) |
| Location |
| Quantity | Values | Remarks Remarks |
| Units | degrees (°) of latitude and longitude | Geodetic latitude |
| Domain | Latitude: ±90°Longitude: ±180° | positive in Northern Hemispherepositive East of Greenwich |
| Range | 0.001° | ~0.1 km |
| Precision | 0.001° | ~0.1 km |
| Vertical sampling | 0.5 km |
| Accuracy | 0.01° | ~1 km |
| Date and time, time tag |
| Quantity | Values | Remarks Remarks |
| Units Year, Month, Day, Hours, Minutes, Seconds, Milliseconds | Absolute: date & time at start of profile |
| Milliseconds | Time-tag: offset from start of profile |
| Range | 2000-2049 y, 1-12 m, 1-31 d, 0-23 h, 0-59 m, 0-59.999 s | 00:00 1 Jan 2000 to 23:59 31 Dec 2049 |
| 0-100,000 ms | Up to 100 s duration (nominal max. 60 s) |
| Precision | 1 ms |
| Vertical sampling | 5 Hz | nominal time equivalent for time-tag |
| Accuracy | 1 ms |
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