This function plots a gps object. An attempt is made to use the whole space
of the plot, and this is done by limiting either the longitude range or the
latitude range, as appropriate, by modifying the eastern or northern limit,
as appropriate.
To get an inset map inside another map, draw the first map, do
par(new=TRUE), and then call plot.gps with a value of
mar that moves the inset plot to a desired location on the existing
plot, and with bg="white".
# S4 method for gps
plot(
x,
xlab = "",
ylab = "",
asp,
clongitude,
clatitude,
span,
projection,
expand = 1,
mgp = getOption("oceMgp"),
mar = c(mgp[1] + 1, mgp[1] + 1, 1, 1),
bg,
axes = TRUE,
cex.axis = par("cex.axis"),
add = FALSE,
inset = FALSE,
geographical = 0,
debug = getOption("oceDebug"),
...
)a gps object.
label for x axis
label for y axis
Aspect ratio for plot. The default is for plot.gps to set
the aspect ratio to give natural latitude-longitude scaling somewhere near
the centre latitude on the plot. Often, it makes sense to set asp
yourself, e.g. to get correct shapes at 45N, use
asp=1/cos(45*pi/180). Note that the land mass is not symmetric about
the equator, so to get good world views you should set asp=1 or set
ylim to be symmetric about zero. Any given value of asp is
ignored, if clongitude and clatitude are given.
optional center latitude of map, in decimal
degrees. If both clongitude and clatitude are provided, then
any provided value of asp is ignored, and instead the plot aspect
ratio is computed based on the center latitude. If clongitude and
clatitude are provided, then span must also be provided.
optional suggested span of plot, in kilometers. The suggestion
is an upper limit on the scale; depending on the aspect ratio of the
plotting device, the radius may be smaller than span. A value for
span must be supplied, if clongitude and clatitude are
supplied.
optional map projection to use (see
mapPlot()); if not given, a cartesian frame is used, scaled so
that gps shapes near the centre of the plot are preserved. If a projection
is provided, the coordinate system will bear an indirect relationship to
longitude and longitude, and further adornment of the plot must be done with
e.g. mapPoints() instead of points().
numerical factor for the expansion of plot limits, showing
area outside the plot, e.g. if showing a ship track as a gps, and then an
actual gps to show the ocean boundary. The value of expand is
ignored if either xlim or ylim is given.
3-element numerical vector to use for par(mgp), and also
for par(mar), computed from this. The default is tighter than the R
default, in order to use more space for the data and less for the axes.
value to be used with par("mar").
optional color to be used for the background of the map. This comes in handy for drawing insets (see “details”).
boolean, set to TRUE to plot axes.
value for axis font size factor.
boolean, set to TRUE to draw the gps on an existing plot.
Note that this retains the aspect ratio of that existing plot, so it is
important to set that correctly, e.g. with asp=1/cos(lat * pi / 180),
where clat is the central latitude of the plot.
set to TRUE for use within plotInset(). The
effect is to prevent the present function from adjusting margins, which is
necessary because margin adjustment is the basis for the method used by
plotInset().
flag indicating the style of axes. If
geographical=0, the axes are conventional, with decimal degrees as
the unit, and negative signs indicating the southern and western
hemispheres. If geographical=1, the signs are dropped, with axis
values being in decreasing order within the southern and western
hemispheres. If geographical=2, the signs are dropped and the axes
are labelled with degrees, minutes and seconds, as appropriate.
set to TRUE to get debugging information during
processing.
optional arguments passed to plotting functions. For example,
set yaxp=c(-90,90,4) for a plot extending from pole to pole.
Dan Kelley
Other functions that plot oce data:
download.amsr(),
plot,adp-method,
plot,adv-method,
plot,amsr-method,
plot,argo-method,
plot,bremen-method,
plot,cm-method,
plot,coastline-method,
plot,ctd-method,
plot,ladp-method,
plot,landsat-method,
plot,lisst-method,
plot,lobo-method,
plot,met-method,
plot,odf-method,
plot,rsk-method,
plot,satellite-method,
plot,sealevel-method,
plot,section-method,
plot,tidem-method,
plot,topo-method,
plot,windrose-method,
plot,xbt-method,
plotProfile(),
plotScan(),
plotTS(),
tidem-class
Other things related to gps data:
[[,gps-method,
[[<-,gps-method,
as.gps(),
gps-class,
read.gps(),
summary,gps-method