Walter H. F. Smith and David T. Sandwell,  Copyright 1997

Please copy and use these digital topography files for your applications.
We are not responsible for errors in the depths.  The depths have limited
accuracy and should not be used for navigation.

The digital data contained in this digital file should not be used
in any product sold for profit without the written consent of the authors.

Consent is not required for creating any kind of graphics
using these data; the copyright only applies to the raw data
values and not to derived products.

The appropriate reference for these data is:

Smith, W. H. F. and D. T. Sandwell, Global Seafloor Topography
from Satellite Altimetry and Ship Depth Soundings, Science, v. 277,
p. 1956-1962, 26 September, 1997.

This COPYRIGHT file must be copied and placed in the same directory as
the digital data file.  In addition, the COPYRIGHT must be attached to any derivative
digital topography grids that are intended for re-distribution.  Our objective
is to have the data distributed as widely as possible, but not sold.

This Copyright also applies to the Land Elevation data although the
original data are provided for free and without Copyright at the
following WWW site.

http://edcwww.cr.usgs.gov/landdaac/gtopo30/gtopo30.html