Both the surface water hydrology and ocean surface topography communities recognize the importance of wide-swath altimetry for its capability of acquiring high-resolution elevation measurements.
- Hydrology: Provide a global inventory of all terrestrial water bodies whose surface area exceeds 250 meters by 250 meters (lakes, reservoirs, wetlands) and rivers whose width exceeds 100 meters (rivers).
- Measure the global storage change in fresh water bodies at sub-monthly, seasonal, and annual time scales.
- Estimate the global change in river discharge at sub-monthly, seasonal, and annual time scales.
- Oceanography: Characterize the ocean mesoscale and sub-mesoscale circulation at spatial resolutions of 15 kilometers and greater.
Artists concept of SWOT KaRIN instrument.
SWOT’s Ka-band Radar Interferometer (KaRIn) will determine ocean and surface water topography. A Jason-class altimeter beam will be located between these swaths.
- KaRIn interferometric system with two 50-kilometer swaths will produce water heights and co-registered all-weather imagery
- KaRIn will be configured to transmit from one side and receive on antennas at both sides
- On-board interferometric radar image processing over the ocean (500m^2 resolution) for data volume reduction
- Fast-sampling orbit (approximately first six months): 857 kilometer altitude, 77.6º inclination, 1 day repeat
- Science orbit (nominally three years): 891 kilometer altitude, 77.6º inclination, 21 day repeat
- Target Launch Readiness: April 2021
|Orbit Height||Orbit Type||Swath||Frequency||Height Precision||Spatial Resolution||Instrument|
|SWOT||857-890 km||22-day repeat|
78 Deg Inclination
|120 km||Ka-band||~1 cm @ 1 km resolution||<100 m imaging||Interferometer|
|OSTM/Jason-2||1336 km||10-day repeat|
66 Deg Inclination
|NA||Ku-band||2 cm||6.2 km along-track; 300 km cross-track||Nadir Altimeter|
Below are various technology presentations in Power Point format that relate to the SWOT mission.