Plots a scan (scan
) in polar coordinates. To plot in Cartesian coordinates,
see project_as_ppi()
.
Arguments
- x
A
scan
object.- param
Character. Scan parameter to plot, e.g.
DBZH
orVRADH
. Seesummary.param()
for commonly available parameters.- xlim
Numeric vector of length 2. Range of x values (range, distance to radar) to plot.
- ylim
Numeric vector of length 2. Range of y values (azimuth) to plot.
- zlim
Numeric vector of length 2. The range of parameter values to plot. Defaults to parameter specific limits for plotting, not full range of data.
- na.value
Character.
ggplot2::ggplot()
parameter to set the color ofNA
values.- ...
Arguments passed to
ggplot2::ggplot()
.
Details
Available scan parameters for plotting can by printed to screen
by summary(x)
. Commonly available parameters are:
DBZH
,DBZ
: (Logged) reflectivity factor (dBZ)TH
,T
: (Logged) uncorrected reflectivity factor (dBZ)VRADH
,VRAD
: Radial velocity (m/s). Radial velocities towards the radar are negative, while radial velocities away from the radar are positiveRHOHV
: Correlation coefficient (unitless). Correlation between vertically polarized and horizontally polarized reflectivity factorPHIDP
: Differential phase (degrees)ZDR
: (Logged) differential reflectivity (dB) The scan parameters are named according to the OPERA data information model (ODIM), see Table 16 in the ODIM specification.
Examples
# Plot reflectivity
plot(example_scan, param = "DBZH")
# \donttest{
# Change the range of reflectivities to plot, from -10 to 10 dBZ
plot(example_scan, param = "DBZH", zlim = c(-10, 10))
# Change the scale name, change the color palette to Viridis colors
plot(example_scan, param = "DBZH", zlim = c(-10, 10)) +
viridis::scale_fill_viridis(name = "dBZ")
#> Scale for fill is already present.
#> Adding another scale for fill, which will replace the existing scale.
# }