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Error characterization of Atmospheric Motion Vectors. Picture. J.Le Marshall. Quality Control (ERR) Considers       Correlation between images U acceleration V acceleration U deviation from first guess V deviation from first guess ………. Quality Indicator (QI) Considers

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Error characterization of Atmospheric Motion Vectors

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Error characterization of atmospheric motion vectors

Error characterization

of Atmospheric

Motion Vectors

Picture

J.Le Marshall


Error characterization of atmospheric motion vectors

Quality Control

(ERR)

Considers

      Correlation between images

U acceleration

V acceleration

U deviation from first guess

V deviation from first guess

………


Error characterization of atmospheric motion vectors

Quality Indicator (QI)

Considers

      Direction consistency (pair)

      Speed consistency (pair)

      Vector consistency (pair)

      Spatial Consistency

      Forecast Consistency

QI = ∑wi.QVi/∑wi


Error characterization of atmospheric motion vectors

EE - provides RMS Error (RMS)

   Estimated from

the five QI components

wind speed

vertical wind shear

temperature shear

pressure level

which are used as predictands for root mean square error


Error characterization of atmospheric motion vectors

Fig. 4 (b): Predicted error using the EE regression approach

Fig. 4 (a): Predicted error using the QI lookup table


Error characterization of atmospheric motion vectors

GMS-5

Table 3 AMV numbers and comparative errors in MMVD

when selecting Upper level WV AMVs by MMVD (November, 2002 )

using EE and QI. (Here vectors are chosen with Av. MMVD equal to

5 and 6 ms-1 respectively)


Error characterization of atmospheric motion vectors

RT EE Computation at JCSDA

EE computed for GOES-East and West SWIR, IR, WV and VIS AMVs

EE also computed Terra and Aqua MODIS AMVs

Currently being set up for NESDIS RT Test

Length scale of correlated error to follow


Error characterization of atmospheric motion vectors

MODIS WINDS v2. Improved winds/QC use of EE


Error characterization of atmospheric motion vectors

Accuracy of EE


Error characterization of atmospheric motion vectors

Accuracy of EE


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