Search Results - "Walker, J.P."

Estimating surface soil moisture from SMAP observations using a Neural Network technique by Kolassa, J., Reichle, R.H., Liu, Q., Alemohammad, S.H., Gentine, P., Aida, K., Asanuma, J., Bircher, S., Caldwell, T., Colliander, A., Cosh, M., Holifield Collins, C., Jackson, T.J., Martínez-Fernández, J., McNairn, H., Pacheco, A., Thibeault, M., Walker, J.P.

“…A Neural Network (NN) algorithm was developed to estimate global surface soil moisture for April 2015 to March 2017 with a 2–3day repeat frequency using…”
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Evaluating soil moisture retrievals from ESA's SMOS and NASA's SMAP brightness temperature datasets by Al-Yaari, A., Wigneron, J.-P., Kerr, Y., Rodriguez-Fernandez, N., O'Neill, P.E., Jackson, T.J., De Lannoy, G.J.M., Al Bitar, A., Mialon, A., Richaume, P., Walker, J.P., Mahmoodi, A., Yueh, S.

“…Two satellites are currently monitoring surface soil moisture (SM) using L-band observations: SMOS (Soil Moisture and Ocean Salinity), a joint ESA (European…”
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Thermal properties of soil in the Murrumbidgee River Catchment (Australia) by Usowicz, B., Łukowski, M.I., Rüdiger, C., Walker, J.P., Marczewski, W.

“…•Distributions of soil heat conductivity and capacity are governed by water content.•Soil thermal diffusivity near its maximum is mainly driven by the bulk…”
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Assimilation of SMOS soil moisture and brightness temperature products into a land surface model by Lievens, H., De Lannoy, G.J.M., Al Bitar, A., Drusch, M., Dumedah, G., Hendricks Franssen, H.-J., Kerr, Y.H., Tomer, S.K., Martens, B., Merlin, O., Pan, M., Roundy, J.K., Vereecken, H., Walker, J.P., Wood, E.F., Verhoest, N.E.C., Pauwels, V.R.N.

“…The Soil Moisture and Ocean Salinity (SMOS) mission has the potential to improve the predictive skill of land surface models through the assimilation of its…”
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A method for retrieving high-resolution surface soil moisture from hydros L-band radiometer and Radar observations by Xiwu Zhan, Houser, P.R., Walker, J.P., Crow, W.T.

“…NASA's Earth System Science Pathfinder Hydrospheric States (Hydros) mission will provide the first global scale space-borne observations of Earth's soil…”
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The NAFE'05/CoSMOS Data Set: Toward SMOS Soil Moisture Retrieval, Downscaling, and Assimilation by Panciera, R., Walker, J.P., Kalma, J.D., Kim, E.J., Hacker, J.M., Merlin, O., Berger, M., Skou, N.

“…The National Airborne Field Experiment 2005 (NAFE'05) and the Campaign for validating the Operation of Soil Moisture and Ocean Salinity (CoSMOS) were…”
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A Simple Method to Disaggregate Passive Microwave-Based Soil Moisture by Merlin, O., Chehbouni, A., Walker, J.P., Panciera, R., Kerr, Y.H.

“…This paper develops two alternative approaches for downscaling passive microwave-derived soil moisture. Ground and airborne data collected over the Walnut…”
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Optical cages by Kumar, V., Walker, J.P., Grebel, H.

“…We examine arrays of metal-mesh frameworks for their wide-band absorption. These take the form of quasi-crystal optical cages. While there are many plasmonic…”
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Improved Understanding of Soil Surface Roughness Parameterization for L-Band Passive Microwave Soil Moisture Retrieval by Panciera, R., Walker, J.P., Merlin, O.

“…Surface roughness parameterization plays an important role in soil moisture retrieval from passive microwave observations. This letter investigates the…”
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Parameterization of the Land Parameter Retrieval Model for L-Band Observations Using the NAFE'05 Data Set by de Jeu, R.A.M., Holmes, T.R.H., Panciera, R., Walker, J.P.

“…The Land Parameter Retrieval Model (LPRM) has been successfully applied to retrieve soil moisture from space-borne passive microwave observations at C-, X-, or…”
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An Assessment of QuikSCAT Ku-Band Scatterometer Data for Soil Moisture Sensitivity by Mladenova, I., Lakshmi, V., Walker, J.P., Long, D.G., De Jeu, R.

“…The QuikSCAT enhanced (2.225-km) backscattering product is investigated for sensitivity to changes in soil moisture and its potential for spatial…”
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Assessing the SMOS Soil Moisture Retrieval Parameters With High-Resolution NAFE'06 Data by Merlin, O., Walker, J.P., Panciera, R., Escorihuela, M.J., Jackson, T.J.

“…The spatial and temporal invariance of Soil Moisture and Ocean Salinity (SMOS) forward model parameters for soil moisture retrieval was assessed at 1-km…”
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Comparison of Microwave and Infrared Land Surface Temperature Products Over the NAFE'06 Research Sites by Parinussa, R.M., de Jeu, R., Holmes, T., Walker, J.P.

“…Two different remotely sensed land surface temperature ( T s ) products are compared with in situ observations from the National Airborne Field Experiment…”
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Using Passive Microwave Response to Soil Moisture Change for Soil Mapping: A Case Study for the Livingstone Creek Catchment by Summerell, G., Shoemark, V., Grant, S., Walker, J.P.

“…The 46-km 2 Livingstone Creek Catchment in southeastern Australia was flown with a passive microwave airborne remote sensor four times throughout the…”
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Flood mapping under vegetation using single SAR acquisitions by Grimaldi, S., Xu, J., Li, Y., Pauwels, V.R.N., Walker, J.P.

“…Synthetic Aperture Radar (SAR) enables 24-hour, all-weather flood monitoring. However, accurate detection of inundated areas can be hindered by the extremely…”
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Assessing vegetation response to irrigation strategies and soil properties in an urban reserve in southeast Australia by Marchionni, V., Fatichi, S., Tapper, N., Walker, J.P., Manoli, G., Daly, E.

“…•Increasing tree cover makes irrigation essential during a prolonged drought.•Irrigation helps alleviate water competition between different vegetation…”
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Estimating catchment scale soil moisture at a high spatial resolution: Integrating remote sensing and machine learning by Senanayake, I.P., Yeo, I.-Y., Walker, J.P., Willgoose, G.R.

“…Soil moisture information is important for a wide range of applications including hydrologic modelling, climatic modelling and agriculture. L-band passive…”
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Modelling the passive microwave signature from land surfaces: A review of recent results and application to the L-band SMOS & SMAP soil moisture retrieval algorithms by Wigneron, J.-P., Jackson, T.J., O'Neill, P., De Lannoy, G., de Rosnay, P., Walker, J.P., Ferrazzoli, P., Mironov, V., Bircher, S., Grant, J.P., Kurum, M., Schwank, M., Munoz-Sabater, J., Das, N., Royer, A., Al-Yaari, A., Al Bitar, A., Fernandez-Moran, R., Lawrence, H., Mialon, A., Parrens, M., Richaume, P., Delwart, S., Kerr, Y.

“…Two passive microwave missions are currently operating at L-band to monitor surface soil moisture (SM) over continental surfaces. The SMOS sensor, based on an…”
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Perception of lexical stress differences in LHD and RHD subjects by Walker, J.P., White, S., Armitage, E., Astbury, B.

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Validation of SMAP surface soil moisture products with core validation sites by Colliander, A., Jackson, T.J., Bindlish, R., Chan, S., Das, N., Kim, S.B., Cosh, M.H., Dunbar, R.S., Dang, L., Pashaian, L., Asanuma, J., Aida, K., Berg, A., Rowlandson, T., Bosch, D., Caldwell, T., Caylor, K., Goodrich, D., al Jassar, H., Lopez-Baeza, E., Martínez-Fernández, J., González-Zamora, A., Livingston, S., McNairn, H., Pacheco, A., Moghaddam, M., Montzka, C., Notarnicola, C., Niedrist, G., Pellarin, T., Prueger, J., Pulliainen, J., Rautiainen, K., Ramos, J., Seyfried, M., Starks, P., Su, Z., Zeng, Y., van der Velde, R., Thibeault, M., Dorigo, W., Vreugdenhil, M., Walker, J.P., Wu, X., Monerris, A., O'Neill, P.E., Entekhabi, D., Njoku, E.G., Yueh, S.

“…The NASA Soil Moisture Active Passive (SMAP) mission has utilized a set of core validation sites as the primary methodology in assessing the soil moisture…”
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