Inspect a plan position indicator (ppi)

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

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

is.ppi(x)

# S3 method for ppi
dim(x)

Arguments

object

A ppi object.

...

Additional arguments affecting the summary produced.

x

A ppi object.

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).

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().

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)
#> [1] TRUE

# Get summary info
ppi # Same as summary(ppi) or print(ppi)
#>                Plan position indicator (class ppi)
#> 
#>   parameters:  DBZH VRADH RHOHV ZDR PHIDP 
#>         dims:  201 x 201 pixels
#> 

# Get dimensions
dim(ppi)
#> [1]   5 201 201