Inspect a scan (scan)

R base functions for inspecting a scan (scan) object.

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

is.scan(x)

# S3 method for scan
dim(x)

Arguments

object

A scan object.

...

Additional arguments affecting the summary produced.

x

A scan object.

Value

For summary.scan(): prints a summary of the scan object

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

For dim.scan(): number of parameters (param), bins and rays in a scan (scan).

Details

A scan (or sweep) is made by the radar at a certain elevation angle. The resulting parameter data (param) are organized along radar range (bins) and azimuth (rays). A scan (scan) object is a list containing:

• radar: Radar identifier.

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

• params: List of scan parameters (param).

• attributes: List of the scan's what, where and how attributes.

• geo: List of the scan's geographic properties:

  • lat: Latitude of the radar in decimal degrees.

  • lon: Longitude of the radar in decimal degrees.

  • height: Height of the radar antenna in meters above sea level.

  • elange: Elevation angle of the radar beam for that scan in degrees.

  • rscale: Range bin size for that scan in m (e.g. 500 m * 480 bins equals 240 km range).

  • ascale: Azimuth bin size for that scan in degrees (e.g. 1 degree * 360 rays equals full circle).

  • rstart: The range where the first range gate starts in meters (note ODIM stores it as kilometers)

  • astart: The start of the first ray.

See also

• get_scan()

• example_scan

• plot.scan()

• get_param()

Examples

# Check if an object is of class scan
is.scan(example_scan)
#> [1] TRUE

# Get summary info
example_scan # Same as summary(example_scan) or print(example_scan)
#>                   Polar scan (class scan)
#> 
#>      parameters:  DBZH VRADH RHOHV ZDR PHIDP 
#> elevation angle:  0.5 deg
#>            dims:  480 bins x 360 rays

# Get dimensions
dim(example_scan)
#> [1]   5 480 360

# Get summary info for the parameters in the scan
example_scan$params
#> $DBZH
#>                Polar scan parameter (class param)
#> 
#>     quantity:  DBZH 
#>         dims:  480 bins x 360 rays
#> 
#> $VRADH
#>                Polar scan parameter (class param)
#> 
#>     quantity:  VRADH 
#>         dims:  480 bins x 360 rays
#> 
#> $RHOHV
#>                Polar scan parameter (class param)
#> 
#>     quantity:  RHOHV 
#>         dims:  480 bins x 360 rays
#> 
#> $ZDR
#>                Polar scan parameter (class param)
#> 
#>     quantity:  ZDR 
#>         dims:  480 bins x 360 rays
#> 
#> $PHIDP
#>                Polar scan parameter (class param)
#> 
#>     quantity:  PHIDP 
#>         dims:  480 bins x 360 rays
#>