Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2015, Vol. 12, No. 2, pp. 77-88
Assessment of the accuracy of the interpolation scheme of satellite radiothermovision
D.M. Ermakov
1,2 , E.A. Sharkov
2 , A.P. Chernushich
1 1 V.A. Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino Dept., Fryazino, Moscow Region, Russia
2 Space Research Institute RAS, Moscow, Russia
The accuracy assessment of the interpolation scheme of satellite radiothermovision is performed based on the analysis of standard products: fields of atmospheric total precipitable water retrieved from global monthly measurements of SSMIS instruments onboard F16 and F17 satellites of the DMSP series and of AMSR-2 instrument onboard GCOM-W1. A representative sample of the data on the basis of a long series of measurements of all of these instruments in November 2013 was analyzed. The total sample consisted of 107 independent measurements evenly distributed over all the basins of the World Ocean. By comparison with the accuracy estimates of the alternative interpolation scheme, known in world practice, the high quality of the interpolation achieved in the approach of satellite radiothermovision was shown. When comparing homogeneous series of data based on SSMIS measurements, the average error of spatiotemporal interpolation of total precipitable water is 0.8 mm. Under cross-comparison with AMSR-2 products the error increases slightly while remaining completely satisfactory for a wide range of practical applications. A more detailed analysis by approximation of the distributions of residual errors with Gauss and Cauchy-Lorentz functions further confirms the high quality of the interpolation scheme. Some opportunities for further development and application of satellite radiothermovision are discussed.
Keywords: accuracy of interpolation, satellite radiothermovision
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