The geolocated radiances and geophysical parameters collected by SLAP are posted on the page for each field campaign as they become available. Please explore the list of field campaigns to learn about the flights from each campaign and download SLAP data.
For older versions of SLAP data, the entire published data archive can also be found on Box.
SLAP radiometer measures all 4 Stokes parameters TH, TV, T3, and T4. The following table lists all data products SLAP is capable of generating, though not all products are available for all campaigns, and some are available only upon request:
The processing steps in the L1A include storing of time stamps for science data as well as housekeeping telemetry such as temperature, voltage and current monitor points converted to engineering units for each antenna scan. The Level 1A product is a time-ordered series of instrument counts and includes housekeeping telemetry converted to engineering units for each scan.
The radiometer calibration constants, TN and Tref, are required to calibrate Level 1B data products. TN is determined by the pre- and post-deployment sky calibrations, but Tref varies from flight to flight and must be computed from the box calibration and physical temperatures for each flight. The level 1B brightness temperature data (L1B_TB) is a time ordered, calibrated, geolocated level 1 data product which is converted from radiometer digital counts.
SLAP’s radiometer passband lies within the 1400-1427 MHz Earth Exploration Satellite Service (EESS) passive frequency allocation. Both unauthorized in-band transmitters as well as out of band emissions from transmitters operating at frequencies adjacent to this allocated spectrum have been documented as sources of radio frequency interference to the L-band radiometers on SMAP, SMOS, and Aquarius.
SLAP includes a functional copy of SMAP's digital back end. Therefore, the radiometer instrument architecture provides science data with time-frequency diversity enabling the use of multiple RFI detection methods. The RFI detection and excision algorithms will be part of the L1B processing which will be performed in ground processing.
