Pang-Wei Liu

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Pang-Wei Liu

  • SR RESEARCH SCIENTIST
  • 301.286.9779
  • NASA/GSFC
  • Mail Code: 617
  • Greenbelt , MD 20771
  • Employer: SCIENCE SYSTEMS AND APPLICATIONS INC
  • Brief Bio

    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.

    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, 2009 - Present
    Member
    American Geophysical Union (AGU), 2009 - Present
    Member

    Selected Publications

    Refereed

    Zhang, C., Z. Yang, H. Zhao, et al. Z. Sun, L. Di, R. Bindlish, P.-W. Liu, A. Colliander, R. Mueller, W. Crow, R. H. Reichle, J. Bolten, and S. H. Yueh. 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]

    Liu, P.-W., R. Bindlish, P. E. Oneill, et al. B. Fang, V. Lakshmi, Z. Yang, M. Cosh, T. Bongiovanni, C. H. Collins, P. Starks, J. Prueger, D. D. Bosch, M. Seyfried, and M. Williams. 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]

    Fang, B., V. Lakshmi, M. Cosh, et al. P. Liu, R. Bindlish, and T. J. Jackson. 2022. "A global 1‐km downscaled SMAP soil moisture product based on thermal inertia theory." Vadose Zone Journal, 21 (2): [10.1002/vzj2.20182]

    Judge, J., P.-W. Liu, A. Monsiváis-Huertero, et al. T. Bongiovanni, S. Chakrabarti, S. C. Steele-Dunne, D. Preston, S. Allen, J. P. Bermejo, P. Rush, R. DeRoo, A. Colliander, and M. Cosh. 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]

    Vermunt, P. C., S. Khabbazan, S. C. Steele-Dunne, et al. J. Judge, A. Monsivais-Huertero, L. Guerriero, and P.-W. Liu. 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]

    Erlingis, J. M., M. Rodell, C. D. Peters‐Lidard, et al. B. Li, S. V. Kumar, J. S. Famiglietti, S. L. Granger, J. V. Hurley, P. Liu, and D. M. Mocko. 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]

    Liu, P.-W., R. Bindlish, B. Fang, et al. V. Lakshmi, P. E. O'Neill, Z. Yang, M. H. Cosh, T. Bongiovanni, D. D. Bosch, C. H. Collins, P. J. Starks, J. Prueger, M. Seyfried, and S. Livingston. 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]

    Fang, B., V. Lakshmi, R. Bindlish, T. J. Jackson, and P.-W. Liu. 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]

    Liu, Z., P.-W. Liu, E. Massoud, et al. T. G. Farr, P. Lundgren, and J. S. Famiglietti. 2019. "Monitoring Groundwater Change in California’s Central Valley Using Sentinel-1 and GRACE Observations." Geosciences, 9 (10): 436 [10.3390/geosciences9100436]

    Monsivais-Huertero, A., P.-W. Liu, and J. Judge. 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]

    Steele-Dunne, S. C., H. McNairn, A. Monsivais-Huertero, et al. J. Judge, P.-W. Liu, and K. Papathanassiou. 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 (Submitted) [10.1109/jstars.2016.2639043]

    Camps, A., H. Park, M. Pablos, et al. G. Foti, C. P. Gommenginger, P.-W. Liu, and J. Judge. 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 (Submitted) [10.1109/jstars.2016.2588467]

    Liu, P.-W., J. Judge, R. D. De Roo, A. W. England, and T. Bongiovanni. 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]

    Liu, P.-W., J. Judge, R. D. DeRoo, et al. A. W. England, T. Bongiovanni, and A. Luke. 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]

    Liu, P.-W., T. Bongiovanni, A. Monsivais-Huertero, et al. J. Judge, S. Steele-Dunne, R. Bindlish, and T. J. Jackson. 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]

    Monsivais-Huertero, A., J. Judge, S. Steele-Dunne, and P.-W. Liu. 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]

    Nagarajan, K., P.-W. Liu, R. DeRoo, et al. J. Judge, R. Akbar, P. Rush, S. Feagle, D. Preston, and R. Terwilleger. 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]

    Liu, P.-W., R. D. De Roo, A. W. England, and J. Judge. 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]

    Liu, P.-W., H. Lee, J. Judge, W. C. Wright, and K. Clint Slatton. 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]

    Tseng, Y., P. Liu, and F. Chou. 2008. "Modeling urban landscapes with integrated datasets." Journal of the Chinese Institute of Engineers, 31 (5): 853-859 [10.1080/02533839.2008.9671438]

    Brief Bio

    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.

    Selected Publications

    Refereed

    Zhang, C., Z. Yang, H. Zhao, et al. Z. Sun, L. Di, R. Bindlish, P.-W. Liu, A. Colliander, R. Mueller, W. Crow, R. H. Reichle, J. Bolten, and S. H. Yueh. 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]

    Liu, P.-W., R. Bindlish, P. E. Oneill, et al. B. Fang, V. Lakshmi, Z. Yang, M. Cosh, T. Bongiovanni, C. H. Collins, P. Starks, J. Prueger, D. D. Bosch, M. Seyfried, and M. Williams. 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]

    Fang, B., V. Lakshmi, M. Cosh, et al. P. Liu, R. Bindlish, and T. J. Jackson. 2022. "A global 1‐km downscaled SMAP soil moisture product based on thermal inertia theory." Vadose Zone Journal 21 (2): [10.1002/vzj2.20182]

    Judge, J., P.-W. Liu, A. Monsiváis-Huertero, et al. T. Bongiovanni, S. Chakrabarti, S. C. Steele-Dunne, D. Preston, S. Allen, J. P. Bermejo, P. Rush, R. DeRoo, A. Colliander, and M. Cosh. 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]

    Vermunt, P. C., S. Khabbazan, S. C. Steele-Dunne, et al. J. Judge, A. Monsivais-Huertero, L. Guerriero, and P.-W. Liu. 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]

    Erlingis, J. M., M. Rodell, C. D. Peters‐Lidard, et al. B. Li, S. V. Kumar, J. S. Famiglietti, S. L. Granger, J. V. Hurley, P. Liu, and D. M. Mocko. 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]

    Liu, P.-W., R. Bindlish, B. Fang, et al. V. Lakshmi, P. E. O'Neill, Z. Yang, M. H. Cosh, T. Bongiovanni, D. D. Bosch, C. H. Collins, P. J. Starks, J. Prueger, M. Seyfried, and S. Livingston. 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]

    Fang, B., V. Lakshmi, R. Bindlish, T. J. Jackson, and P.-W. Liu. 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]

    Liu, Z., P.-W. Liu, E. Massoud, et al. T. G. Farr, P. Lundgren, and J. S. Famiglietti. 2019. "Monitoring Groundwater Change in California’s Central Valley Using Sentinel-1 and GRACE Observations." Geosciences 9 (10): 436 [10.3390/geosciences9100436]

    Monsivais-Huertero, A., P.-W. Liu, and J. Judge. 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]

    Steele-Dunne, S. C., H. McNairn, A. Monsivais-Huertero, et al. J. Judge, P.-W. Liu, and K. Papathanassiou. 2017. "Radar Remote Sensing of Agricultural Canopies: A Review." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (Submitted) 10 (5): 2249-2273 [10.1109/jstars.2016.2639043]

    Camps, A., H. Park, M. Pablos, et al. G. Foti, C. P. Gommenginger, P.-W. Liu, and J. Judge. 2016. "Sensitivity of GNSS-R Spaceborne Observations to Soil Moisture and Vegetation." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (Submitted) 9 (10): 4730-4742 [10.1109/jstars.2016.2588467]

    Liu, P.-W., J. Judge, R. D. De Roo, A. W. England, and T. Bongiovanni. 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]

    Liu, P.-W., J. Judge, R. D. DeRoo, et al. A. W. England, T. Bongiovanni, and A. Luke. 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]

    Liu, P.-W., T. Bongiovanni, A. Monsivais-Huertero, et al. J. Judge, S. Steele-Dunne, R. Bindlish, and T. J. Jackson. 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]

    Monsivais-Huertero, A., J. Judge, S. Steele-Dunne, and P.-W. Liu. 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]

    Nagarajan, K., P.-W. Liu, R. DeRoo, et al. J. Judge, R. Akbar, P. Rush, S. Feagle, D. Preston, and R. Terwilleger. 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]

    Liu, P.-W., R. D. De Roo, A. W. England, and J. Judge. 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]

    Liu, P.-W., H. Lee, J. Judge, W. C. Wright, and K. Clint Slatton. 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]

    Tseng, Y., P. Liu, and F. Chou. 2008. "Modeling urban landscapes with integrated datasets." Journal of the Chinese Institute of Engineers 31 (5): 853-859 [10.1080/02533839.2008.9671438]

                                                                                                                                                                                            
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