TY - GEN
T1 - Comparison of downscaling techniques for high resolution soil moisture mapping
AU - Sabaghy, Sabah
AU - Walker, Jeffrey
AU - Renzullo, Luigi
AU - Akbar, Ruzbeh
AU - Chan, Steven
AU - Chaubell, Julian
AU - Das, Narendra
AU - Dunbar, R. Scott
AU - Entekhabi, Dara
AU - Gevaert, Anouk
AU - Jackson, Thomas
AU - Merlin, Olivier
AU - Moghaddam, Mahta
AU - Peng, Jinzheng
AU - Piepmeier, Jeffrey
AU - Piles, Maria
AU - Portal, Gerard
AU - Rudiger, Christoph
AU - Stefan, Vivien
AU - Wu, Xiaoling
AU - Ye, Nan
AU - Yueh, Simon
PY - 2017/12/4
Y1 - 2017/12/4
N2 - 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 product across the two missions anymore. Existing optical-, radiometer-, and oversampling-based downscaling methods could be an alternative to the radar-based approach for delivering such data. Nevertheless, retrieval of a consistent high resolution soil moisture product remains a challenge, and there has been no comprehensive intercomparison of the alternate approaches. This research undertakes an assessment of the different downscaling approaches using the SMAPEx-4 field campaign data.
AB - 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 product across the two missions anymore. Existing optical-, radiometer-, and oversampling-based downscaling methods could be an alternative to the radar-based approach for delivering such data. Nevertheless, retrieval of a consistent high resolution soil moisture product remains a challenge, and there has been no comprehensive intercomparison of the alternate approaches. This research undertakes an assessment of the different downscaling approaches using the SMAPEx-4 field campaign data.
KW - comparison
KW - downscaling
KW - soil moisture
UR - http://www.scopus.com/inward/record.url?scp=85041860114&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85041860114&partnerID=8YFLogxK
U2 - 10.1109/IGARSS.2017.8127508
DO - 10.1109/IGARSS.2017.8127508
M3 - Conference contribution
AN - SCOPUS:85041860114
T3 - International Geoscience and Remote Sensing Symposium (IGARSS)
SP - 2523
EP - 2526
BT - 2017 IEEE International Geoscience and Remote Sensing Symposium
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 37th Annual IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2017
Y2 - 23 July 2017 through 28 July 2017
ER -