Pang-Wei Liu is currently a research scientist in Hydrological Science Laboratory of NASA’s Goddard Space Flight Center contracted through Science Systems and Applications Inc. His research interests include active and passive microwave remote sensing modeling for soil moisture and agricultural crops; data disaggregation; groundwater monitoring using GRACE; data assimilation with crop growth models and Land Information System; application of LiDAR for forest biomass; and GNSS-R remote sensing for terrestrial applications. He has developed an algorithm to enhance the spatial resolution of SMAP soil moisture product to support USDA NASS's crop conditions and soil moisture analytics system.
Pang-Wei Liu
(SR RESEARCH SCIENTIST)
| Email: | pang-wei.liu@nasa.gov |
| Phone: | 301.286.9779 |
| Org Code: | 617 |
| Address: |
NASA/GSFC Mail Code 617 Greenbelt, MD 20771 |
| Employer: | SCIENCE SYSTEMS AND APPLICATIONS INC |
Brief Bio
Education
Ph.D., Agricultural and Biological Engineering with a minor in Electrical and Computer Engineering, University of Florida, Gainesville, Florida, USA, 2013.
M.S., Civil Engineering, University of Florida, Gainesville, Florida, 2009.
M.S., Geomatics, National Cheng-Kung University, Tainan, Taiwan, 2003.
B.S., Geomatics, National Cheng-Kung University, Tainan, Taiwan, 2001.
Professional Societies
IEEE Geosciences and Remote Sensing
Member
2009 - Present
American Geophysical Union (AGU)
Member
2009 - Present
Awards
- Top 25 Earth, Environmental, and Planetary Sciences Article of 2022 for Nature Communications. Article title: Groundwater depletion in California’s Central Valley accelerates during megadrought.
- Hydrosphere, Biosphere, and Geophysics Annual Award for Scientific Achievement (personal award), NASA Goddard Space Flight Center, 2022.
- Hydrosphere, Biosphere, and Geophysics Annual Award for Scientific Achievement (team award with Land Information System Data Assimilation Team), NASA Goddard Space Flight Center, 2022.
Publications
Refereed
2024. "Soil moisture profile estimation under bare and vegetated soils using combined L-band and P-band radiometer observations: An incoherent modeling approach." Remote Sensing of Environment 307 114148 [10.1016/j.rse.2024.114148] [Journal Article/Letter]
2024. "Droughts impede water balance recovery from fires in the Western United States." Nature Ecology & Evolution [10.1038/s41559-023-02266-8] [Journal Article/Letter]
2023. "A Comparison of Passive Microwave Emission Models for Estimating Brightness Temperature at L- and P-Bands Under Bare and Vegetated Soil Conditions." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 17 2570-2585 [10.1109/jstars.2023.3344764] [Journal Article/Letter]
2023. "Interconnected hydrologic extreme drivers and impacts depicted by remote sensing data assimilation." Scientific Reports 13 (1): 3411 [10.1038/s41598-023-30484-4] [Journal Article/Letter]
2022. "Groundwater depletion in California’s Central Valley accelerates during megadrought." Nature Communications 13 (1): 7825 [10.1038/s41467-022-35582-x] [Journal Article/Letter]
2022. "Assimilation of Remotely Sensed Leaf Area Index Enhances the Estimation of Anthropogenic Irrigation Water Use." Journal of Advances in Modeling Earth Systems 14 (11): [10.1029/2022ms003040] [Journal Article/Letter]
2022. "Flash Drought Onset and Development Mechanisms Captured with Soil Moisture and Vegetation Data Assimilation." Water Resources Research [10.1029/2022wr032894] [Journal Article/Letter]
2022. "Crop-CASMA: A web geoprocessing and map service based architecture and implementation for serving soil moisture and crop vegetation condition data over U.S. Cropland." International Journal of Applied Earth Observation and Geoinformation 112 102902 [10.1016/j.jag.2022.102902] [Journal Article/Letter]
2022. "Remote sensing-based vegetation and soil moisture constraints reduce irrigation estimation uncertainty." Environmental Research Letters 17 (8): 084010 [10.1088/1748-9326/ac7ed8] [Journal Article/Letter]
2022. "Thermal hydraulic disaggregation of SMAP soil moisture over the continental United States." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 15 4072-4092 [10.1109/jstars.2022.3165644] [Journal Article/Letter]
2022. "A global 1‐km downscaled SMAP soil moisture product based on thermal inertia theory." Vadose Zone Journal 21 (2): [10.1002/vzj2.20182] [Journal Article/Letter]
2021. "Impact of vegetation water content information on soil moisture retrievals in agricultural regions: An analysis based on the SMAPVEX16-MicroWEX dataset." Remote Sensing of Environment 265 112623 [10.1016/j.rse.2021.112623] [Journal Article/Letter]
2021. "Response of Subdaily L-Band Backscatter to Internal and Surface Canopy Water Dynamics." IEEE Transactions on Geoscience and Remote Sensing 59 (9): 7322-7337 [10.1109/tgrs.2020.3035881] [Journal Article/Letter]
2021. "A High‐Resolution Land Data Assimilation System Optimized for the Western United States." JAWRA Journal of the American Water Resources Association 1-19 [10.1111/1752-1688.12910] [Journal Article/Letter]
2021. "Assessing Disaggregated SMAP Soil Moisture Products in the United States." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 14 2577-2592 [10.1109/jstars.2021.3056001] [Journal Article/Letter]
2020. "Evaluation and validation of a high spatial resolution satellite soil moisture product over the Continental United States." Journal of Hydrology 588 125043 [10.1016/j.jhydrol.2020.125043] [Journal Article/Letter]
2019. "Monitoring Groundwater Change in California’s Central Valley Using Sentinel-1 and GRACE Observations." Geosciences 9 (10): 436 [10.3390/geosciences9100436] [Journal Article/Letter]
2018. "Phenology-Based Backscattering Model for Corn at L-Band." IEEE Transactions on Geoscience and Remote Sensing 56 (9): 4989-5005 [10.1109/tgrs.2018.2803153] [Journal Article/Letter]
2017. "Radar Remote Sensing of Agricultural Canopies: A Review." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 10 (5): 2249-2273 [10.1109/jstars.2016.2639043] [Journal Article/Letter]
2016. "Sensitivity of GNSS-R Spaceborne Observations to Soil Moisture and Vegetation." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 9 (10): 4730-4742 [10.1109/jstars.2016.2588467] [Journal Article/Letter]
2016. "Uncertainty in Soil Moisture Retrievals Using the SMAP Combined Active–Passive Algorithm for Growing Sweet Corn." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 9 (7): 3326-3339 [10.1109/jstars.2016.2562660] [Journal Article/Letter]
2016. "Dominant backscattering mechanisms at L-band during dynamic soil moisture conditions for sandy soils." Remote Sensing of Environment 178 104-112 [10.1016/j.rse.2016.02.062] [Journal Article/Letter]
2016. "Assimilation of Active and Passive Microwave Observations for Improved Estimates of Soil Moisture and Crop Growth." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 9 (4): 1357-1369 [10.1109/jstars.2015.2506504] [Journal Article/Letter]
2016. "Impact of Bias Correction Methods on Estimation of Soil Moisture When Assimilating Active and Passive Microwave Observations." IEEE Transactions on Geoscience and Remote Sensing 54 (1): 262-278 [10.1109/tgrs.2015.2455037] [Journal Article/Letter]
2014. "Automated L-Band Radar System for Sensing Soil Moisture at High Temporal Resolution." IEEE Geoscience and Remote Sensing Letters 11 (2): 504-508 [10.1109/lgrs.2013.2270453] [Journal Article/Letter]
2013. "Impact of Moisture Distribution Within the Sensing Depth on L- and C-Band Emission in Sandy Soils." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 6 (2): 887-899 [10.1109/jstars.2012.2213239] [Journal Article/Letter]
2011. "Prediction of L-band signal attenuation in forests using 3D vegetation structure from airborne LiDAR." ISPRS Journal of Photogrammetry and Remote Sensing 66 (5): 642-651 [10.1016/j.isprsjprs.2011.04.005] [Journal Article/Letter]
2008. "Modeling urban landscapes with integrated datasets." Journal of the Chinese Institute of Engineers 31 (5): 853-859 [10.1080/02533839.2008.9671438] [Journal Article/Letter]