Plot a scan (scan) in polar coordinates

Source: R/plot.scan.R

Plots a scan (scan) in polar coordinates. To plot in Cartesian coordinates, see project_as_ppi().

# S3 method for class 'scan'
plot(
  x,
  param,
  xlim = c(0, 1e+05),
  ylim = c(0, 360),
  zlim = c(-20, 20),
  na.value = "transparent",
  ...
)

Arguments

x

A scan object.

param

Character. Scan parameter to plot, e.g. DBZH or VRADH. See summary.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 of NA values.

...

Arguments passed to ggplot2::ggplot().

Value

No return value, side effect is a plot.

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 positive

  • RHOHV: Correlation coefficient (unitless). Correlation between vertically polarized and horizontally polarized reflectivity factor

  • PHIDP: 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.

# }