http://www2.jpl.nasa.gov/srtm/
Public Data Distribution
ftp://e0dps01u.ecs.nasa.gov
http://www.ncor.ntu.edu.tw/ODBS/mgd/
GLOBE v1.0全球30弧秒陸地地形資料
Global Land One-kilometer Base Elevation Data Set, NOAA National Geophysical Dat
a Center, NGDC, 1998
ftp://edcftp.cr.usgs.gov/pub/data/gtopo30/global/
水深資料庫
http://www.ncor.ntu.edu.tw/ODBS/depth/download/
depth_download.html#numerical_data
glcf
ftp://ftp.glcf.umiacs.umd.edu/
usgs
http://walrus.wr.usgs.gov/infobank/gazette/html/regions/gl.html
etopo2
http://pc12-c714.uibk.ac.at/GPLIGC/download/digital_elevation_model/etopo2/
Global GIS Data Sets
http://phobos.lab.csuchico.edu/hosted/sustainable/gis_data/global_data/
global.html
Digital Elevation Model Data Availability
http://www.fugawi.com/docs/ded.html
GeoGratis: Free Links
http://geogratis.cgdi.gc.ca/clf/en?action=freelinks
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