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README
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XTide: Harmonic tide clock and tide predictor
San Francisco graph
Preface
Welcome to the verbose documentation for XTide 2. If you are reading
this as a text file, please be aware that the text was extracted from
the illustrated HTML version of the documentation that resides at
[1]http://www.flaterco.com/xtide/. The web version may also be more
up-to-date than what you are reading.
__________________________________________________________________
THE XTIDE SOFTWARE DISTRIBUTION IS AVAILABLE FROM:
[2]http://www.flaterco.com/xtide/files.html
__________________________________________________________________
[3]Buoy in the mist
Contents
* [4]License and disclaimer ("NOT FOR NAVIGATION," "ABSOLUTELY NO
WARRANTY")
* Verbose documentation
+ [5]Introduction
+ [6]System requirements
+ [7]Installation instructions for supported platforms
+ [8]Available ports for unsupported platforms
+ [9]Modes and formats
+ [10]Using the interactive interface
+ [11]Advanced usage
+ [12]Using the command line interface
+ [13]Running the web server
+ [14]Customizing XTide
+ [15]What to do if your location isn't listed
+ [16]Quirks, limitations, and bugs
+ [17]FAQ
+ [18]Design notes
+ [19]Credits
+ [20]Bibliography
+ [21]Appendix A -- Historical predictions and Y2038 compliance
+ [22]Appendix B -- Application of offsets for Min Flood and Min
Ebb events
+ [23]Appendix C -- Making calendars fit onto a single page
* Short attention span documentation for experienced XTide users
+ [24]Differences from XTide 1
+ [25]Quick install instructions
+ [26]Change log
+ [27]News (current XTide developments)
The XTide software distribution resides at
[28]http://www.flaterco.com/xtide/files.html.
Hint: If you have no idea what all this is about, try reading the
[29]FAQ first.
-- David Flater ([email protected])
References
1. http://www.flaterco.com/xtide/
2. http://www.flaterco.com/xtide/files.html
3. http://www.flaterco.com/
4. http://www.flaterco.com/xtide/disclaimer.html
5. http://www.flaterco.com/xtide/introduction.html
6. http://www.flaterco.com/xtide/sysreq.html
7. http://www.flaterco.com/xtide/installation.html
8. http://www.flaterco.com/xtide/ports.html
9. http://www.flaterco.com/xtide/modes.html
10. http://www.flaterco.com/xtide/interactive.html
11. http://www.flaterco.com/xtide/advanced.html
12. http://www.flaterco.com/xtide/tty.html
13. http://www.flaterco.com/xtide/xttpd.html
14. http://www.flaterco.com/xtide/settings.html
15. http://www.flaterco.com/xtide/harmonics.html
16. http://www.flaterco.com/xtide/bugs.html
17. http://www.flaterco.com/xtide/faq.html
18. http://www.flaterco.com/xtide/design.html
19. http://www.flaterco.com/xtide/credits.html
20. http://www.flaterco.com/xtide/bibliography.html
21. http://www.flaterco.com/xtide/time_t.html
22. http://www.flaterco.com/xtide/mincurrents.html
23. http://www.flaterco.com/xtide/pound_to_fit.html
24. http://www.flaterco.com/xtide/xtide1diff.html
25. http://www.flaterco.com/xtide/quickinst.html
26. http://www.flaterco.com/xtide/changelog.html
27. http://www.flaterco.com/xtide/news.html
28. http://www.flaterco.com/xtide/files.html
29. http://www.flaterco.com/xtide/faq.html
################################################################
[1]-> Next [2]Contents
Icon License and disclaimer
NOTE. The license and disclaimer appearing below applies to the XTide
program itself. For information about permissions on the harmonic
constants, see
[3]http://www.flaterco.com/xtide/harmonics_boilerplate.txt and
[4]http://harmonics.unh.edu/xtide/harmonics_boilerplate.txt.
XTide Copyright © 1998 David Flater
This software is provided under the terms of the GNU General Public
License, either version 3 of the License, or (at your option) any later
version.
Although the package as a whole is GPL, some individual source files
are public domain. Consult their header comments for details.
NOT FOR NAVIGATION
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. The author
assumes no liability for damages arising from use of this program OR of
any 'harmonics data' that might be distributed with it. For details,
see the appended GNU General Public License.
(Accurate tide predictions can only be made if the 'harmonics data' for
the relevant location are good. Unfortunately, the only way the
maintainer of those data has of knowing when they are bad is when
someone with access to authoritative tide predictions or observations
reports a problem. You should not use this program or any data files
that might be distributed with it if anyone or anything could come to
harm as a result of an incorrect tide prediction. NOAA and similar
agencies in other countries can provide you with certified tide
predictions if that is what you need.)
XTide's predictions do not incorporate the effects of tropical storms,
El Niño, seismic events, subsidence, uplift, or changes in global sea
level.
__________________________________________________________________
The tide prediction algorithm used in this program was developed with
United States Government funding, so no proprietary rights can be
attached to it. For more information, refer to the following
publications:
Manual of Harmonic Analysis and Prediction of Tides. Special
Publication No. 98, Revised (1940) Edition (reprinted 1958 with
corrections; reprinted again 1994). United States Government
Printing Office, 1994.
Computer Applications to Tides in the National Ocean Survey.
Supplement to Manual of Harmonic Analysis and Prediction of Tides
(Special Publication No. 98). National Ocean Service, National
Oceanic and Atmospheric Administration, U.S. Department of Commerce,
January 1982.
__________________________________________________________________
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <[5]http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
Preamble
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Also add information on how to contact you by electronic and paper
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If the program does terminal interaction, make it output a short notice
like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the
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use an "about box".
You should also get your employer (if you work as a programmer) or
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. For more information on this, and how to apply and follow
the GNU GPL, see <[6]http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your
program into proprietary programs. If your program is a subroutine
library, you may consider it more useful to permit linking proprietary
applications with the library. If this is what you want to do, use the
GNU Lesser General Public License instead of this License. But first,
please read <[7]http://www.gnu.org/philosophy/why-not-lgpl.html>.
__________________________________________________________________
[8]-> Next [9]Contents
References
1. http://www.flaterco.com/xtide/introduction.html
2. http://www.flaterco.com/xtide/xtide.html#contents
3. http://www.flaterco.com/xtide/harmonics_boilerplate.txt
4. http://harmonics.unh.edu/xtide/harmonics_boilerplate.txt
5. http://fsf.org/
6. http://www.gnu.org/licenses/
7. http://www.gnu.org/philosophy/why-not-lgpl.html
8. http://www.flaterco.com/xtide/introduction.html
9. http://www.flaterco.com/xtide/xtide.html#contents
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[1]<- Previous [2]-> Next [3]Contents
[4]Bald Head Cliff, Ogunquit, Maine, 1998-06-15
Introduction
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
[5]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 these data
from harmonics files. See [6]http://www.flaterco.com/xtide/files.html
for details on where to get one.
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.
The XTide software distribution resides at
[7]http://www.flaterco.com/xtide/files.html.
XTide and its documentation are maintained by David Flater
__________________________________________________________________
[8]<- Previous [9]-> Next [10]Contents
References
1. http://www.flaterco.com/xtide/disclaimer.html
2. http://www.flaterco.com/xtide/sysreq.html
3. http://www.flaterco.com/xtide/xtide.html#contents
4. http://www.flaterco.com/
5. http://oceanservice.noaa.gov/
6. http://www.flaterco.com/xtide/files.html
7. http://www.flaterco.com/xtide/files.html
8. http://www.flaterco.com/xtide/disclaimer.html
9. http://www.flaterco.com/xtide/sysreq.html
10. http://www.flaterco.com/xtide/xtide.html#contents
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[1]<- Previous [2]-> Next [3]Contents
[4]Cutler in the fog
System requirements
Hardware
The base configuration for which XTide 2 was written was a 166 MHz
Pentium PC with 32 MiB of RAM (circa 1997). XTide version 2.9 was
successfully tested on the same PC in 2007, although by that time the
RAM had been expanded to 96 MiB. Comparable non-PC hardware (e.g., Sun
Sparcstation) also works.
XTide uses less than 10 MB of memory for a typical interactive session.
Operating system
XTide is Unix software. It is intended to compile and run correctly on
any reasonably modern version of Unix. However, I no longer have
direct access to any flavor of Unix other than Linux, so I can only
make portability fixes if and when issues are reported.
In order for tide predictions to have the correct Daylight Savings Time
(Summer Time) adjustments, your platform must provide a sufficiently
up-to-date version of the tz database. This has recently become an
issue again since the U.S. changed its Daylight Savings Time rules for
2007. If your time zone database is obsolete, you may be able to
upgrade it using the latest version from
[5]ftp://elsie.nci.nih.gov/pub/ or by installing an operating system
patch.
Some non-Unix platforms have limited support:
* XTide can be run under Windows using [6]Cygwin.
* A native Windows binary for the command-line client can be built
using [7]Visual C++ Express Edition.
* XTide has been ported to a variety of other operating systems with
differing levels of success as detailed in the [8]ports section.
Software
XTide is intended to compile under any reasonably modern C++ compiler
that supports the Standard Template Library. However, I no longer have
direct access to any compiler other than GCC, so I can only make
portability fixes if and when issues are reported.
For GCC, "reasonably modern" means version 3.4 or newer.
You need [9]bzip2, [10]7-Zip or some other archiver that supports the
bzip2 format to uncompress the files. A list of libraries on which
XTide is dependent is provided in the [11]next section.
__________________________________________________________________
[12]<- Previous [13]-> Next [14]Contents
References
1. http://www.flaterco.com/xtide/introduction.html
2. http://www.flaterco.com/xtide/installation.html
3. http://www.flaterco.com/xtide/xtide.html#contents
4. http://www.flaterco.com/
5. ftp://elsie.nci.nih.gov/pub/
6. http://www.flaterco.com/xtide/installation.html#cygwin
7. http://www.flaterco.com/xtide/installation.html#VC++
8. http://www.flaterco.com/xtide/ports.html
9. http://www.bzip.org/
10. http://www.7-zip.org/
11. http://www.flaterco.com/xtide/installation.html
12. http://www.flaterco.com/xtide/introduction.html
13. http://www.flaterco.com/xtide/installation.html
14. http://www.flaterco.com/xtide/xtide.html#contents
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[1]<- Previous [2]-> Next [3]Contents
[4]Prospect Harbor Pt. Light, Prospect Harbor, Maine, 1998-06-14
Installation instructions for supported platforms
Assumptions
These installation instructions assume that you are building from
sources obtained from [5]http://www.flaterco.com/xtide/files.html.
However, some users may be able to shortcut this process: XTide has
been included in [6]Fedora and [7]Debian, and a Windows native binary
for the command-line client is available under [8]contrib files.
(Thanks to the relevant package maintainers.)
These instructions also assume that you are building XTide version
2.9. Previous versions of XTide were not packaged with [9]GNU
automake, so the installation process was not as standardized. In
addition, they statically linked with an included version of libtcd
instead of using a shared libtcd that was installed separately. For
these reasons and others it is advisable that you upgrade to XTide 2.9.
Dependencies
In addition to the minimal set of X11 libraries that pretty much
everyone has, you need the following libraries:
* [10]libXpm 3.4 or newer compatible version
* [11]libpng version 0.96 or newer compatible version
* [12]zlib (a.k.a. libz) version 1.0.4 or newer compatible version