xtide(1)xtide(1)NAMExtide - Harmonic tide clock and tide predictor (interactive client)
SYNOPSISxtide [-b ``YYYY-MM-DD HH:MM''] [-bc color] [-bg color] [-cb y|n] [-cc
color] [-ch pixels] [-cw pixels] [-dc color] [-Dc color] [-df ``format-
string''] [-display ``X display''] [-ec color] [-el y|n] [-em pSsMm]
[-fc color] [-fe y|n] [-fg color] [-fn font] [-ga aspect] [-geometry
``�XOFF�YOFF''] [-gf font] [-gh pixels] [-gl longitude] [-gs d|l|s]
[-gt y|n] [-gw pixels] [-hf ``format-string''] [-in y|n] [-l ``location
name''] [-lw pixels] [-m a|g|k|m|p|r] [-mc color] [-Mc color] [-mf
font] [-ml [-]N.NN(ft|m|kt)] [-nc color] [-ou y|n] [-tc color] [-tf
``format-string''] [-tl y|n] [-to opacity] [-u ft|m] [-v] [-z y|n]
DESCRIPTION
XTide is a package that provides tide and current predictions in a wide
variety of formats. Graphs, text listings, and calendars can be gener‐
ated, 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).
xtide is the interactive X-windows client for XTide 2. Although in
reality it accepts many command line options, you should not need to
use them; everything can be done interactively. Just run xtide and
point and click your way to whatever you need. If you get stuck, click
on a `?' button for on-line help.
For a complete discussion of the command line options and a detailed
explanation of the interactive interface, please see the verbose docu‐
mentation at http://www.flaterco.com/xtide/.
CONFIGURATION
Unless a configuration file /etc/xtide.conf is supplied, you must set
the environment variable HFILE_PATH to point to the harmonics files
that should have been installed along with the xtide program. Example:
export HFILE_PATH=/usr/local/share/xtide/harmonics.tcd
If a configuration file is used, the first line should consist of the
colon-separated list of harmonics files (e.g. the HFILE_PATH line above
without the "export HFILE_PATH=" part). The environment variable takes
precedence over the configuration file.
If the optional World Vector Shoreline files have been installed, the
path to those files can be supplied in the WVS_DIR environment variable
or as the second line of the configuration file.
Set the environment variable XTIDE_DEFAULT_LOCATION to the name of your
favorite place if you want to skip the location-choosing step.
OPTIONS-b ``YYYY-MM-DD HH:MM''
Specify the begin (start) time for predictions using the ISO
8601 compliant format YYYY-MM-DD HH:MM, where hours range from
00 to 23. The timestamp is in the local time zone for the loca‐
tion, or in UTC if the -z setting is engaged. If clock mode is
selected or if no -b is supplied, the current time will be used.
-bc color
Background color of buttons (default gray80).
-bg color
Background color for text windows and location chooser (default
white).
-cb y|n
Select whether or not tide clocks should be created with buttons
(default n).
-cc color
Color of dots indicating current stations in the location
chooser (default rgb:00/A0/00).
-ch pixels
Initial height for tide clocks (default 312 pixels).
-cw pixels
Initial width for tide clocks (default 84 pixels).
-dc color
Daytime background color in tide graphs (default SkyBlue).
-Dc color
Color of datum line in tide graphs (default white).
-df ``format-string''
strftime(3) style format string for printing dates (default
%Y-%m-%d).
-display ``X display''
Specify the X display, e.g. "quake:0.0". This overrides the
DISPLAY environment variable.
-ec color
Foreground in tide graphs during outgoing tide (default Sea‐
Green).
-el y|n
Select whether or not to draw datum and middle-level lines in
tide graphs (default n).
The National Ocean Service (NOS) defines both Mean Sea Level
(MSL) and Mean Tide Level (MTL) in terms of averages taken over
observations. The middle-level line is drawn at the midpoint of
the theoretical tidal range, which usually corresponds to the
mathematical mean level of the predictions. This approximates
both MSL and MTL, but, strictly speaking, is equivalent to nei‐
ther. Moreover, subordinate station offsets may shift the
actual mean so that it no longer falls at the midpoint of the
tidal range. The datum line is drawn at the zero level of the
predictions, which usually corresponds to the station's bench‐
mark, but this too can be rendered inaccurate by subordinate
station offsets.
-em pSsMm
Events to suppress (p = phase of moon, S = sunrise, s = sunset,
M = moonrise, m = moonset), or x to suppress none. E.g, to sup‐
press all sun and moon events, set eventmask to the value pSsMm.
-fc color
Foreground in tide graphs during incoming tide (default Blue).
-fe y|n
Select whether or not to prefer flat map to round globe location
chooser (default n).
-fg color
Color of text and other notations (default black).
-fn font
Font used for button labels and verbiage in text windows
(default as incoming from X11 or libXaw3dXft). See NOTES.
-ga aspect
Initial aspect for tide graphs and clocks (default 1.0). This
controls not the width or height of the window but rather the
relative scaling of the X and Y axes in the plot of the tide
curve.
-geometry ``�XOFF�YOFF''
Specify a position for the window corresponding to the first use
of -l. (Width and height are controlled by different settings.)
-gf font
Font used in graphs and clocks in interactive client (default
"embedded"). Does not affect SVG-format output. See NOTES.
-gh pixels
Initial height for tide graphs (default 312 pixels).
-gl longitude
Initial center longitude for location chooser. Valid values are
-180 -150 -120 -90 -60 -30 0 30 60 90 120 150 and 360. 360 (the
default) will pick the longitude with the most tide stations.
-gs d|l|s
Style of graphs and clocks. Valid values: d (default), l
(line), s (semitransparent).
-gt y|n
Select whether or not to label tenths of units in tide graphs
(default n).
-gw pixels
Initial width for tide graphs (default 960 pixels).
-hf ``format-string''
strftime(3) style format string for printing hour labels on time
axis (default %l).
-in y|n
Select whether or not to use inferred values for some con‐
stituents (default n). For expert use only.
-l ``location name''
Specify a location for tide predictions. When given to the
interactive client, this causes it to start a tide clock for the
specified location instead of launching a location chooser on
startup. This is useful for starting a tide clock automatically
when you log on. Multiple uses of -l will result in multiple
tide clocks.
-lw pixels
Width of line in graph styles l and s (default 2.5 pixels).
-m a|g|k|m|p|r
Specify mode to be about, graph, clock, medium rare, plain, or
raw. The default is clock.
-mc color
Color of mark line in graphs (default red).
-Mc color
Color of middle-level line in tide graphs (default yellow).
-mf font
Monospace font used for location list, text predictions, help
windows and about mode text (default "-misc-fixed-medium-r-nor‐
mal--13-100-100-100-c-70-iso8859-1" (without libXaw3dXft) or
"LiberationMono-12" (with libXaw3dXft)). See NOTES.
-ml [-]N.NN(ft|m|kt)
Specify an initial mark level to be used in prediction windows
launched from the command line. The predictions will include
the times when the tide level crosses the mark. The mark level
also can be specified or changed using the Options menu. Not
supported in clock mode. Does not affect windows that are
launched from the location chooser. Example usage: -ml -0.25ft
-nc color
Nighttime background color in tide graphs (default DeepSkyBlue).
-ou y|n
Select whether or not to print numbers with no ft/m/kt (default
n).
-tc color
Color of dots indicating tide stations in the location chooser
(default red).
-tf ``format-string''
strftime(3) style format string for printing times (default
%l:%M %p %Z).
-tl y|n
Select whether or not to draw depth lines on top of the tide
graph (default n).
-to opacity
Opacity of the fill in graph style s (semitransparent) (default
0.65).
-u ft|m
Preferred units of length (default no preference).
-v Print version string and exit.
-z y|n Select whether or not to coerce all time zones to UTC (default
n).
NOTES
If XTide is built with Xaw3dXft, font names given to XTide must be in
fontconfig format (e.g., "Helvetica-10"), rather than the traditional
XLFD (e.g., "-*-helvetica-*-r-*-*-10-*-*-*-*-*-*-*"). Also, Xaw3dXft
does not return errors if there are problems with a font name; it just
loads a default font instead.
SEE ALSOtide(1), xttpd(8), http://www.flaterco.com/xtide/.
XTide 2 2014-05-04 xtide(1)
