bioRad (version 0.12.0)

project_as_ppi: Project a scan (scan) or parameter (param) to a plan position indicator (ppi)

Description

Make a plan position indicator (ppi)

Usage

project_as_ppi(
  x,
  grid_size = 500,
  range_max = 50000,
  project = TRUE,
  ylim = NULL,
  xlim = NULL,
  raster = NA,
  k = 4/3,
  re = 6378,
  rp = 6357
)
# S3 method for param
project_as_ppi(
  x,
  grid_size = 500,
  range_max = 50000,
  project = TRUE,
  ylim = NULL,
  xlim = NULL,
  raster = NA,
  k = 4/3,
  re = 6378,
  rp = 6357
)
# S3 method for scan
project_as_ppi(
  x,
  grid_size = 500,
  range_max = 50000,
  project = TRUE,
  ylim = NULL,
  xlim = NULL,
  raster = NA,
  k = 4/3,
  re = 6378,
  rp = 6357
)

Value

An object of class 'ppi'.

Arguments

x

An object of class param or scan.

grid_size

Cartesian grid size in m.

range_max

Maximum range in m.

project

Whether to vertically project onto earth's surface.

ylim

The range of latitudes to include.

xlim

The range of longitudes to include.

raster

(optional) raster::RasterLayer or terra::SpatRaster with a CRS. When specified this raster topology is used for the output, and grid_size, range_max, xlim, ylim are ignored.

k

Numeric. Standard refraction coefficient.

re

Numeric. Earth equatorial radius, in km.

rp

Numeric. Earth polar radius, in km.

Methods (by class)

• project_as_ppi(param): Project as ppi for a single scan parameter.

• project_as_ppi(scan): Project multiple ppi's for all scan parameters in a scan

Details

The returned PPI is in Azimuthal Equidistant Projection.

Examples

# load a polar scan example object:
data(example_scan)
example_scan

# plot the scan:
plot(example_scan)

# make PPIs for all scan parameters in the scan:
ppi <- project_as_ppi(example_scan)

# print summary info for the ppi:
ppi

# plot the ppi:
plot(ppi)

# extract the DBZH scan parameter of the volume to a new
# object 'param':
param <- get_param(example_scan, "VRADH")

# make a ppi for the new 'param' object:
ppi <- project_as_ppi(param)

# print summary info for this ppi:
ppi

# plot the ppi:
plot(ppi)