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xtide: A program for calculating tide all over the world
- Summary
- XTide is a package that provides tide and current
predictions in a wide variety of formats. Graphs, text listings, and
calendars can be generated, or a tide clock can be provided on your
desktop.
XTide can work with X-windows, plain text terminals, or the web. This
is accomplished with three separate programs: the interactive
interface (xtide), the non-interactive or command line interface
(tide), and the web interface (xttpd).
The algorithm that XTide uses to predict tides is the one used by the
National Ocean Service in the U.S. It is significantly more accurate
than the simple tide clocks that can be bought in novelty stores.
However, it takes more to predict tides accurately than just a spiffy
algorithm -- you also need some special data for each and every
location for which you want to predict tides. XTide reads this data
from harmonics files. See http://www.flaterco.com/xtide/files.html
for details on where to get these.
Ultimately, XTide's predictions can only be as good as the available
harmonics data. Due to issues of data availability and of
compatibility with non-U.S. tide systems, the predictions for
U.S. locations tend to be a lot better on average than those for
locations outside of the U.S. It is up to you to verify that the
predictions for your locale match up acceptably well with the
officially sanctioned ones.
* Deviations of 1 minute from official predictions are typical for
U.S. locations having the latest data.
* Deviations of 20 minutes are typical for non-U.S. locations or
U.S. locations that are using obsolete data.
* Much longer deviations indicate a problem.
Changelog
- * Fri Dec 17 16:00:00 2004 David M. Kaplan <dmk{%}erizo{*}ucdavis{*}edu> 0:2.8-2
- Made a small hack that should make it compile on x86_64 systems.
- * Wed Dec 15 16:00:00 2004 David M. Kaplan <dmk{%}erizo{*}ucdavis{*}edu> 0:2.8-1
- Updated to version 2.8
- Cleaned up spec file because much of the tricks to get it to work
are no longer necessary.
- * Mon Dec 8 16:00:00 2003 David M. Kaplan <dmk{%}erizo{*}ucdavis{*}edu> 0:2.6.4-0.fdr.4
- Removed 644 permissions.