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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.
Outline
2
• Several high spatial resolution satellite soil moistureproductsatseveralkilometersareavailable
• Evaluation of these methods/products is essential andhighlyrequiredbyresearchcommunities
• Objectives• Inter-comparehigh-resolutionsatellitesoilmoistureproductsusing
triplecollocationapproachandCOSMOS-UKmeasurements
• Investigatethepotentialofmergingexistingsoilmoistureproductstoobtainthebesthigh-resolutionsoilmoistureestimate
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
Validation against COSMOS measurements
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ErrorstatisticsforeachstationDirectcomparison
(a)
(b)
Validation against COSMOS measurements
5
ErrorstatisticsforeachstationAnomalycomparison
(a)
(b)
Validation against COSMOS measurements
6
Comparisonbasedoncollocatedsamples
(a)
(b)
(a)
(b)
Direct comparison
Anomaly comparison
Triple collocation analysis
7
(a)
(b)
Truth?
In-situ
Model
Satellite
Triple collocation merging scheme
8
Spatial pattern of merged soil moisture
9
2016.03
Evaluation of merged soil moisture product
10
Evaluation of merged soil moisture product
11
(a)
(b)
(c)
(d)
(a)
(b)
(c)
(d)
Direct comparison
Anomaly comparison
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
