project_as_ppi: Project a scan ('scan') or parameter ('param') to a plan...

In adokter/birdRad: Biological Analysis and Visualization of Weather Radar Data

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 class '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 class '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
)

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) RasterLayer 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.

Details

The returned PPI is in Azimuthal Equidistant Projection.

Value

An object of class 'ppi'.

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

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)

adokter/birdRad documentation built on Nov. 5, 2024, 10:27 p.m.