https://doi.org/10.5194/hess-21-323-2017-supplement

Improvements to a MODIS global terrestrial evapotranspiration algorithm (http://files.ntsg.umt.edu/data/NTSG_Products/MOD16/) Q. Mu, M. Zhao, and S. W. Running https://doi.org/10.1016/j.rse.2011.02.019

The gravity recovery and climate experiment: Mission overview and early results (ftp://podaac.jpl.nasa.gov/allData/grace/L2/CSR/RL05/) B. D. Tapley, S. Bettadpur, M. Watkins, and C. Reigber https://doi.org/10.1029/2004GL019920

Global precipitation at one-degree daily resolution from multisatellite observations (ftp://meso.gsfc.nasa.gov/pub/1dd-v1.2/) G. J. Huffman, R. F. Adler, M. M. Morrissey, D. T. Bolvin, S. Curtis, R. Joyce, B. McGavock, and J. Susskind https://doi.org/10.1175/1525-7541(2001)002\textless0036:GPAODD\textgreater2.0.CO;2

Program to calculate the spectral harmonic expansion coefficients of the two scalar fields product (http://cpc.cs.qub.ac.uk/summaries/ABHK_v1_0.html) Z. Martinec https://doi.org/10.1016/0010-4655(89)90043-X

An approach for spherical harmonic analysis of non-smooth data (http://www.iamg.org/documents/oldftp/VOL32/v32-10-11.zip) H. Wang, P. Wu, and Z. Wang https://doi.org/10.1016/j.cageo.2006.03.004