| plot.topo {oce} | R Documentation |
Plot contours of topographic data.
## S3 method for class 'topo':
plot(x,
water.z,
water.col,
water.lty,
water.lwd,
land.z,
land.col,
land.lty,
land.lwd,
legend.loc="topright",
asp,
mgp=getOption("oce.mgp"),
mar=c(mgp[1],mgp[1],0.5,0.5),
...)
x |
an topo object, e.g. as read by read.topo. |
water.z |
depths at which to plot water contours. If not provided, these are inferred from the data. |
water.col |
colors corresponding to water.z values. If
not provided, these will be "fill" colors from
oce.colors.gebco. |
water.lty |
line type(s) for water contours |
water.lwd |
line width(s) for water contours |
land.z |
depths at which to plot land contours. If not provided, these are inferred from the data. |
land.col |
colors corresponding to land.z values. If
not provided, these will be "fill" colors from
oce.colors.gebco. |
land.lty |
line type(s) for land contours |
land.lwd |
line width(s) for land contours |
legend.loc |
location for a legend (or FALSE, for no legend). |
asp |
Aspect ratio for plot. The default is for
plot.coastline 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. |
mgp |
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. |
mar |
value to be used with par("mar"). |
... |
additional arguments passed on to plotting functions |
The plot aspect ratio is set based on the middle latitude in the plot. Be aware that the ETOPO2 data are on a 2-minute (roughly 2-mile) spacing, and coastlines created with such data can be quite inaccurate on scales of 100km or less.
The line properties, such as land.lwd, may either be a single
item, or a vector; in the latter case, the length must match the
length of the corresponding properties, e.g. land.z.
Dan Kelley
TOPO data can be created with read.topo and
summarized with summary.topo.
library(oce) data(topo.maritimes) plot(topo.maritimes)