Usage
trajPlot(mydata, lon = "lon", lat = "lat", pollutant = "height",
type = "default", map = TRUE, group = NA, map.fill = TRUE,
map.res = "default", map.cols = "grey40", map.alpha = 0.4,
projection = "lambert", parameters = c(51, 51), orientation = c(90, 0,
0), grid.col = "deepskyblue", npoints = 12, origin = TRUE, ...)
Arguments
mydata
Data frame, the result of importing a trajectory
file using importTraj.
lon
Column containing the longitude, as a decimal.
lat
Column containing the latitude, as a decimal.
pollutant
Pollutant to be plotted. By default the
trajectory height is used.
type
type determines how the data are split
i.e. conditioned, and then plotted. The default is will produce a
single plot using the entire data. Type can be one of the built-in
types as detailed in cutData e.g. "season", "year",
"
map
Should a base map be drawn? If TRUE the world
base map from the maps package is used.
group
It is sometimes useful to group and colour
trajectories according to a grouping variable. See example
below.
map.fill
Should the base map be a filled polygon? Default
is to fill countries.
map.res
The resolution of the base map. By default the
function uses the world map from the maps
package. If map.res = "hires" then the (much) more
detailed base map worldHires from the mapdata<
map.cols
If map.fill = TRUE map.cols controls
the fill colour. Examples include map.fill = "grey40"
and map.fill = openColours("default", 10). The latter
colours the countries and can help differentiate them.
map.alpha
The transpency level of the filled map which
takes values from 0 (full transparency) to 1 (full
opacity). Setting it below 1 can help view trajectories,
trajectory surfaces etc. and a filled base map.
projection
The map projection to be used. Different map
projections are possible through the mapproj
package. See ?mapproject for extensive details and
information on setting other parameters and orientation (see
below).
parameters
From the mapproj package. Optional
numeric vector of parameters for use with the projection
argument. This argument is optional only in the sense that
certain projections do not require additional parameters. If a
projection does not requ
orientation
From the mapproj package. An optional
vector c(latitude, longitude, rotation) which describes where
the "North Pole" should be when computing the
projection. Normally this is c(90, 0), which is appropriate
for cylindrical and conic projec
grid.col
The colour of the map grid to be used. To remove
the grid set grid.col = "transparent".
npoints
A dot is placed every npoints along each
full trajectory. For hourly back trajectories points are
plotted every npoint hours. This helps to understand
where the air masses were at particular times and get a feel
for the speed
origin
If true a filled circle dot is shown to mark the
receptor point.
...
other arguments are passed to cutData and
scatterPlot. This provides access to arguments used in
both these functions and functions that they in turn pass
arguments on to. For example, plotTraj passes the
argumen