0000000000429439

AUTHOR

R. Scott Dunbar

showing 3 related works from this author

Comparison of downscaling techniques for high resolution soil moisture mapping

2017

Soil moisture impacts exchanges of water, energy and carbon fluxes between the land surface and the atmosphere. Passive microwave remote sensing at L-band can capture spatial and temporal patterns of soil moisture in the landscape. Both ESA and NASA have launched L-band radiometers, in the form of the SMOS and SMAP satellites respectively, to monitor soil moisture globally, every 3-day at about 40 km resolution. However, their coarse scale restricts the range of applications. While SMAP included an L-band radar to downscale the radiometer soil moisture to 9 km, the radar failed after 3 months and this initial approach is not applicable to developing a consistent long term soil moisture prod…

L bandRadiometer010504 meteorology & atmospheric sciences0211 other engineering and technologiesdownscalingFOS: Physical sciencesPhysics - Applied PhysicsApplied Physics (physics.app-ph)02 engineering and technology01 natural scienceslaw.inventionAtmosphereMicrowave imaging13. Climate actionlawcomparisonEnvironmental scienceRadarsoil moistureScale (map)Water content021101 geological & geomatics engineering0105 earth and related environmental sciencesDownscalingRemote sensing
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The SMAP mission combined active-passive soil moisture product at 9 km and 3 km spatial resolutions

2018

Abstract The NASA Soil Moisture Active Passive (SMAP) mission was launched on January 31st, 2015. The spacecraft was to provide high-resolution (3 km and 9 km) global soil moisture estimates at regular intervals by combining for the first time L-band radiometer and radar observations. On July 7th, 2015, a component of the SMAP radar failed and the radar ceased operation. However, before this occurred the mission was able to collect and process ~2.5 months of the SMAP high-resolution active-passive soil moisture data (L2SMAP) that coincided with the Northern Hemisphere's vegetation green-up and crop growth season. In this study, we evaluate the SMAP high-resolution soil moisture product deri…

National Snow and Ice Data CenterRadiometer010504 meteorology & atmospheric sciences0211 other engineering and technologiesNorthern HemisphereSoil ScienceGeology02 engineering and technologyVegetation01 natural sciencesActive passivelaw.inventionlawEnvironmental scienceProduct (category theory)Computers in Earth SciencesRadarWater content021101 geological & geomatics engineering0105 earth and related environmental sciencesRemote sensingRemote Sensing of Environment
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The SMAP and Copernicus Sentinel 1A/B microwave active-passive high resolution surface soil moisture product

2019

Abstract Soil Moisture Active Passive (SMAP) mission of NASA was launched in January 2015. Currently, SMAP has an L-band radiometer and a defunct L-band radar with a rotating 6-m mesh reflector antenna. On July 7th, 2015, the SMAP radar malfunctioned and became inoperable. Consequently, the production of high-resolution active-passive soil moisture product got hampered, and only ~2.5 months (April 15th, 2015 to July 7th, 2015) of data remain available. Therefore, during the SMAP post-radar phase, many ways were examined to restart the high-resolution soil moisture product generation of the SMAP mission. One of the feasible approaches was to substitute the SMAP radar with other available SAR…

National Snow and Ice Data Center010504 meteorology & atmospheric sciences0208 environmental biotechnologySoil Science02 engineering and technology01 natural scienceslaw.inventionlawCalibrationComputers in Earth SciencesRadarImage resolution0105 earth and related environmental sciencesRemote sensingRadiometeractive-passiveGeologySMAPradiometer020801 environmental engineeringBrightness temperatureTemporal resolutionEnvironmental sciencesoil moistureMicrowaveSARRemote Sensing of Environment
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