Mr. Chandan Banerjee Profile

Chandan Banerjee

at Indian Institute of Science

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Proceedings Article | 13 May 2016 Paper

Inter-comparison of GRACE data over India

Chandan Banerjee, D. Nagesh Kumar

Proceedings Volume 9877, 98772H (2016) https://doi.org/10.1117/12.2223498

KEYWORDS: Satellites, Spherical lenses, Remote sensing, Hydrology, Aerospace engineering, Climatology, Earth's atmosphere, Thermal weapon sites, Spatial resolution, Gaussian filters

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The advent of satellite remote sensing and its use in hydrology has facilitated a huge leap in the understanding of the various water resources, its interaction with ecological systems and anthropogenic creations. Recently, NASA and German Aerospace Research Agency-DLR launched the Gravity Recovery and Climate Experiment (GRACE) satellite mission consisting of two satellites. They measure the time varying gravity which gives changes in the distribution of mass on the surface of the earth which after removing atmospheric and oceanic effects is majorly caused by changes in Terrestrial Water Storage (TWS) changes. GRACE data is generally available as spherical harmonic coefficients, which is difficult for hydrologists to understand and interpret. JPL’s TELLUS website is now providing gridded global data set in the form of mass anomaly derived from the Level-2 data sets of spherical harmonic coefficients of 3 sources, viz. CSR, GFZ and JPL. Before using these data sets for solving hydrological problems, it is important to understand the differences and similarities between these data sets as direct calibration of GRACE data is not possible. In this study we do an inter-comparison of the Level-3 Release 05 data sets over India. We compare the data sets using Pearson, Spearman and Kendall correlation. CSR and GFZ data sets appear to be closest to each other whereas JPL and GFZ data sets are most different from each other.

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