The ESA SMOS (Soil Moisture and Ocean Salinity) and NASA SMAP (Soil Moisture Active-Passive) satellites use the same passive microwave radiometer technology as the TerraRad radiometers.
Photo: Global soil moisture index derived from ESA SMOS – CC BY-SA IGO 3.0
L-band radiometers use the passive-protected frequency band between 1400-1427 MHz.
Image: US RF frequency allocation
Space-borne radiometers provide global soil moisture data near 25 km pixel resolution. The drone-based radiometer from TerraRad Tech provides 5-10 m ground resolution
Image: animation of NASA SMAP satellite
TerraRad Tech also offers ground-based systems for satellite validation, downscaling studies, and development of improved retrieval methods.
TerraRad Tech ground-based systems have heritage in rugged field conditions including aboard the MOSAiC expedition near the north pole