"Researchers of the Western Australian Geodesy Group have developed a suite of spherical harmonic models of Earth’s topography, rock-eqivalent topography, Earth’s shape and implied topographic potential. Our Earth2012 models are complete to degree and order 2160. The spherical harmonic models available here are based on the SRTM V4.1, SRTM30_PLUS and ETOPO data, and can be used in applications such as forward-modelling, Bouguer anomaly computation and evaluation of geopotential models."
Earth2012 - https://geodesy.curtin.edu.au/research/models/Earth2012/
SRTM30_PLUS - http://topex.ucsd.edu/WWW_html/srtm30_plus.html
SRTM V4.1 - http://www.cgiar-csi.org/data/srtm-90m-digital-elevation-database-v4-1
ETOPO - https://www.ngdc.noaa.gov/mgg/global/global.html
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