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High-resolutionsatellitesoilmoistureevaluationandestimation
JianPeng,EwanPinnington,EmmaRobinson,JonathanEvans,TristanQuaife,PhilHarris,EleanorBlyth,SimonDadson
Email:[email protected]
Jian Peng, Ewan Pinnington, Emma Robinson, Jonathan Evans, Tristan Quaife, Phil Harris, Eleanor Blyth, Simon Dadson, High-resolution soil moisture estimation and evaluation from Earth observation in UK mainland, In preparation.
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Outline
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• Several high spatial resolution satellite soil moistureproductsatseveralkilometersareavailable
• Evaluation of these methods/products is essential andhighlyrequiredbyresearchcommunities
• Objectives• Inter-comparehigh-resolutionsatellitesoilmoistureproductsusing
triplecollocationapproachandCOSMOS-UKmeasurements
• Investigatethepotentialofmergingexistingsoilmoistureproductstoobtainthebesthigh-resolutionsoilmoistureestimate
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Study area and data
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COSMOS%UK((Cosmic(ray,soil,moisture,monitoring,network),
(
Soilmoistureproduct Temporalresolution
Gridsize Originalband/frequency
SMOS Daily 1km L-band(1.4GHz)
SMAP Daily 9km L-band(1.41GHz)
Sentinel-1 Daily 1km C-band(5.405GHz)
Sentinel-1/SMAPcombined Daily 3km /
JULES-CHESS Daily 1km /
38 sites
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Validation against COSMOS measurements
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ErrorstatisticsforeachstationDirectcomparison
(a)
(b)
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Validation against COSMOS measurements
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ErrorstatisticsforeachstationAnomalycomparison
(a)
(b)
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Validation against COSMOS measurements
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Comparisonbasedoncollocatedsamples
(a)
(b)
(a)
(b)
Direct comparison
Anomaly comparison
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Triple collocation analysis
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(a)
(b)
Truth?
In-situ
Model
Satellite
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Triple collocation merging scheme
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Spatial pattern of merged soil moisture
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2016.03
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Evaluation of merged soil moisture product
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Evaluation of merged soil moisture product
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(a)
(b)
(c)
(d)
(a)
(b)
(c)
(d)
Direct comparison
Anomaly comparison
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Conclusion
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• SMAP soil moisture product outperforms other existingsatelliteproductscomparedtoCOSMOS-UKmeasurements
• Merged soil moisture integrates the benefit of satelliteobservations and JULES-CHESS output, based on TC errorestimationandleastsquaremergingscheme
• 9kmand1kmintegratedandgaplesssoilmoistureproductwillbegeneratedovertheUKmainland