网站：
CRS(the University of Texas at Austin Center for Space Research):
grace任务网站 http://www2.csr.utexas.edu/grace/
CRS网站 https://www.csr.utexas.edu/datasets/ftp-portal-grace-data/
ftp地址 ftp://ftp.csr.utexas.edu/pub/slr/degree_2/
GFZ(German Research Center for Geo-sciences):
ftp ftp://isdcftp.gfz-potsdam.de/grace
IAG网站 http://icgem.gfz-potsdam.de/tom_longtime
JPL(Jet Propulsion Laboratory):
https://grace.jpl.nasa.gov/data/data-analysis-tool/
https://grace.jpl.nasa.gov/data/get-data/
GNES(Center National d Etudes Spatiales):
https://grace.obs-mip.fr/variable-models-grace-lageos/grace-solutions-release-02/
NASA：https://hydro1.gesdisc.eosdis.nasa.gov/data/GLDAS_V1/GLDAS_NOAH10_M/
