summary.ppi: Inspect a plan position indicator ('ppi')

In bioRad: Biological Analysis and Visualization of Weather Radar Data

Inspect a plan position indicator (ppi)

Description

R base functions for inspecting a plan position indicator (ppi) object.

Usage

## S3 method for class 'ppi'
summary(object, ...)

is.ppi(x)

## S3 method for class 'ppi'
dim(x)

Arguments

object	A ppi object.
...	Additional arguments affecting the summary produced.
x	A ppi object.

Details

A plan position indicator is a projection of radar data onto the earth's surface, generated from a single scan (scan) with project_as_ppi(), a polar volume (pvol) with integrate_to_ppi() or multiple plan position indicators (ppi) with composite_ppi(). A plan position indicator (ppi) object is a list containing:

• radar: Radar identifier.

• datetime: Nominal time of the volume to which the scan belongs in UTC.

• data: A sp::SpatialGridDataFrame containing the georeferenced data. See summary.param() for commonly available parameters, such as DBZH.

• geo: List of the scan's geographic properties (see the geo element in summary.scan()), with two additional properties:

  • bbox: Bounding box for the plan position indicator in decimal degrees.

  • merged: Logical. Flag to indicate if a plan position indicator is a composite of multiple scans. TRUE if generated with integrate_to_ppi() or composite_ppi().

Value

For is.ppi(): TRUE for an object of class ppi, otherwise FALSE.

For dim.ppi(): number of parameters (param), x and y pixels in a plan position indicator (ppi).

See Also

• project_as_ppi()

• integrate_to_ppi()

• plot.ppi()

• map()

• composite_ppi()

• [ppi()

Examples

# Project a scan as a ppi
ppi <- project_as_ppi(example_scan)

# Check if it is an object of class ppi
is.ppi(ppi)

# Get summary info
ppi # Same as summary(ppi) or print(ppi)

# Get dimensions
dim(ppi)

bioRad documentation built on Aug. 29, 2025, 5:14 p.m.