9/23/97 Compressed tiff image of global topography. Use gzip to decompress. 5/31/97 Land topography from the USGS EROS data center were added. 10/12/96 The tiff files in this directory are images of the seafloor topography derived from ship soundings and recently declassified satellite altimeter data. 1/3/00 Topography updated with version 8.2. Please go ahead and use them as you like. David Sandwell