Results 181 to 190 of about 4,460 (223)

The Soil Moisture Active Passive Validation Experiment 2012 (SMAPVEX12): Prelaunch Calibration and Validation of the SMAP Soil Moisture Algorithms

IEEE Transactions on Geoscience and Remote Sensing, 2015
The National Aeronautics and Space Administration (NASA) Soil Moisture Active Passive (SMAP) satellite is scheduled for launch in January 2015. In order to develop robust soil moisture retrieval algorithms that fully exploit the unique capabilities of SMAP, algorithm developers had identified a need for long-duration combined active and passive L-band ...
Heather McNairn, Thomas J. Jackson, Grant Wiseman, Stephane Belair, Aaron Berg, Paul Bullock, Andreas Colliander, Michael H. Cosh, Seung-Bum Kim, Ramata Magagi, Mahta Moghaddam, Eni G. Njoku, Justin R. Adams, Saeid Homayouni, Emmanuel Ojo, Tracy Rowlandson, Jiali Shang, Kalifa Goita, Mehdi Hosseini   +18 more
openaire   +3 more sources

A Combined Active–Passive Soil Moisture Estimation Algorithm With Adaptive Regularization in Support of SMAP

IEEE Transactions on Geoscience and Remote Sensing, 2015
We present a method to combine same-resolution measurements of active radar and passive radiometer microwave remote sensing to build a framework for soil moisture estimation in support of the Soil Moisture Active and Passive (SMAP) mission. A unified active–passive soil moisture estimation algorithm is developed within a global optimization scheme ...
Ruzbeh Akbar, Mahta Moghaddam
openaire   +3 more sources

Soil Moisture Active/Passive (SMAP) Mission concept

SPIE Proceedings, 2008
Soil Moisture Active/Passive (SMAP) Mission is one of the first satellites being developed by NASA in response to the National Research Council's Decadal Survey. SMAP will make global measurements of the moisture present at Earth's land surface and will distinguish frozen from thawed land surfaces. Direct observations of soil moisture and freeze/thaw
D. Entekhabi, T. J. Jackson, E. Njoku, P. O'Neill, J. Entin   +4 more
openaire   +1 more source

The Soil Moisture Active/Passive Mission (SMAP)

IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium, 2008
The Soil Moisture Active/Passive (SMAP) mission will deliver global views of soil moisture content and its freeze/thaw state that are critical terrestrial water cycle state variables. Polarized measurements obtained with a shared antenna L-band radar and radiometer system will allow accurate estimation of soil moisture at hydrometeorological scale (10 ...
Dara Entekhabi, Eni Njoku, Peggy O'Neill, Michael Spencer, Tom Jackson, Jared Entin, Eastwood Im, Kent Kellogg   +7 more
openaire   +1 more source

The Soil Moisture Active/Passive (SMAP) radar

2008 IEEE Radar Conference, 2008
The soil moisture active/passive (SMAP) mission is a NASA mission identified by the NRC ldquodecadal surveyrdquo to measure both soil moisture and freeze/thaw state from space. The mission will use both active radar and passive radiometer instruments at L-band. In order to achieve a wide swath at sufficiently high resolution for both active and passive
Michael Spencer, Yunjin Kim, Samuel Chan
openaire   +1 more source

NASA's Soil Moisture Active Passive (SMAP) observatory

2013 IEEE Aerospace Conference, 2013
The Soil Moisture Active Passive (SMAP) mission, one of the first-tier missions recommended by the 2007 U.S. National Research Council Committee on Earth Science and Applications from Space, was confirmed in May 2012 by NASA to proceed into Implementation Phase (Phase C) with a planned launch in October 2014.
Kent Kellogg, Sam Thurman, Wendy Edelstein, Michael Spencer, Gun-Shing Chen, Mark Underwood, Eni Njoku, Shawn Goodman, Benhan Jai   +8 more
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The Soil Moisture Active Passive (SMAP) applications activity

2011 IEEE International Geoscience and Remote Sensing Symposium, 2011
The Soil Moisture Active Passive (SMAP) mission is one of the first-tier satellite missions recommended by the U.S. National Research Council Committee on Earth Science and Applications from Space. The SMAP mission 1 is under development by NASA and is scheduled for launch late in 2014.
Molly E Brown, Susan Moran, Vanessa Escobar, Dara Entekhabi, Peggy O'Neill, Eni Njoku   +5 more
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Passive/active microwave soil moisture disaggregation using SMAP data

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
Soil moisture at high spatial resolution is required for various land processes related studies. However, currently the resolution of passive microwave retrieved soil moisture is low. To solve this problem, a soil moisture disaggregation algorithm based on thermal inertia relationship between daily temperature change and average soil moisture modulated
Bin Fang, Venkat Lakshmi, Rajat Bindlish, Tom Jackson, Michael Cosh, Andreas Colliander   +5 more
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Active–Passive Soil Moisture Retrievals During the SMAP Validation Experiment 2012

IEEE Geoscience and Remote Sensing Letters, 2016
The goal of this study is to assess the performance of the active–passive algorithm for the NASA Soil Moisture Active Passive mission (SMAP) using airborne and ground observations from a field campaign. The SMAP active–passive algorithm disaggregates the coarse-resolution radiometer brightness temperature ( $TB$ ) using high-resolution radar ...
Delphine J. Leroux, Narendra N. Das, Dara Entekhabi, Andreas Colliander, Eni Njoku, Thomas J. Jackson, Simon Yueh   +6 more
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Physically-based active-passive modelling and retrieval for SMAP soil moisture inversion algorithm

2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2015
The NASA Soil Moisture Active Passive (SMAP) mission is designed to produce high-resolution (9 km) global mapping of surface soil moisture based on L-band radar and radiometer measurements. The multi-scale measurements are combined using time-series of active passive microwave data to retrieve the statistical regression parameters (α, β) from ...
Jagdhuber, Thomas, Entekhabi, D., Hajnsek, I., Konings, A. G., McColl, K. A., Alemohammad, S. H., Das, N. N., Montzka, C.   +7 more
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