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The TeraScan system supports three of the DMSP special sensors:
Special Sensor Microwave Imager (SSM/I) Special Sensor Microwave Temperature Sounder (SSM/T1) Special Sensor Microwave Water Vapor Sounder (SSM/T2)
The SSM/I is a microwave radiometer employing a conical scan with the following seven channels: 19v, 19h, 22v, 37v, 37h, 85v and 85h GHz. The spot size varies from about 50km for the 19 GHz channels to about 15 km for the 85 GHz channels. The SSM/I is primarily used to estimate various geophysical properties of the Earth and/or atmosphere. These include total columnar atmospheric precipitable water, ocean surface wind speed, sea ice concentration, etc. The TeraScan functions miedr and geoph converts SSM/I brightness temperatures into these, and other, geophysical quantities. The SSM/I sensor is only available on the f-8, f-10 and f-11 satellites (not on f-9).
The SSM/T1 is a cross-track scanning microwave radiometer with the following seven channels: 50.5, 53.2, 54.35, 54.9, 58.4, 58.825 and 59.4 GHz. The spot size for these channels is approximately 175km at nadir. These channels can be inverted using the TeraScan function t1edr to estimate the temperature, pressure height and wind vector profiles of the atmosphere.
The SSM/T2 is a cross-track scanning microwave radiometer with five microwave channels. It has three channels situated symmetrically about the 183.310 water vapor resonance line, 180.310 +/-1, 183.310 +/-3, 183.310 +/-7, and two window channels, 91.655 and 150 Ghz. These channels can be inverted using the TeraScan function t2edr to estimate the water vapor, specific humidity, and relative humidity profiles of the atmosphere. The SSM/T2 is only available on the f-11 satellite.
The SSJ4 sensor is used to measure electron and ion counts in the atmosphere. It is a nadir viewing sensor with one sample per line per second. Ion and electron counts are taken at twenty energy levels from 0.948 to 948 Kev. See energy_levels variables in SSJ4 output datasets.
TeraScan provides the functions rtdin and rdsin to extract the special sensor data from the RTD
and RDS/SDS telemetry streams respectively (see dmsp).
dmsp, ols, dmdm, rtdin, rdsin, emath, fastreg, fixline, miedr, t1edr, t2edr, geoph, master, xvu.
Last Update: $Date: 2001/10/15 23:57:18 $
