A direction as a function of the coordinates (see
xyLayer).
FUN
A function to be applied to the zones calculated with
dirXY and zonal.
digits
An integer, number of digits for zonal.
xlab, ylab
Labels of the axis.
par.settings
Customization of lattice. See
levelplot and rasterTheme for details.
xscale.components
See xscale.raster.
labels, region
Customization of contourplot when add.contour is
TRUE.
add.contour
Logical, if TRUE a contourplot with filled regions
is drawn.
...
Additional arguments for the contourplot
and levelplot functions.
Details
Extracted from wikipedia: "A Hovm<c3><83><c2><b6>ller diagram is a
commonly used way of plotting meteorological data to highlight the role
of waves. The axes of a Hovm<c3><83><c2><b6>ller diagram are typically longitude or
latitude (abscissa or x-axis) and time (ordinate or y-axis) with the
value of some field represented through color or shading."
The direction defined by dirXY and the function FUN allows
for a variety of diagrams with this method.
Author(s)
Oscar Perpi<c3><83><c2><b1><c3><83><c2><a1>n Lamigueiro
References
Hovmoller, E. 1949. The trough and ridge diagram. Tellus 1, 62<c3><a2><c2><80><c2><93>66.