ScaleSep

ScaleSep separates a radar image into different spatial scales.

Overview

ScaleSep applies a filter in the 2-D fast Fourier transform frequency domain to separate a two-dimensional radar reflectivity field into different spatial scales.

Prerequesites

The following items are required:

• MDV radar files

Parameter file

ScaleSep uses one parameter file that includes the input/output directories and spatial filtering algorithm parameters.

Ensure file is up to date

To obtain the default parameter file, use the following command:

/path/to/lrose/install/bin/ScaleSep -print_params > param_file_name

If you already have a parameter file and simply want to check for (and add) updated parameters while retaining current parameters, use the following command:

/path/to/lrose/install/bin/ScaleSep -params orig_param_file_name -print_params > new_param_file_name

Important parameters

Process control

• mode: determines if the program waits for new files (REALTIME), moves through start and end times specified on the command line (ARCHIVE), or moves through list of files specified on the command line (FILELIST)

Data input

• input_url: path of the input data
• dbz_field_name: name of the reflectivity field name in input files
• analysis_method: method to compute the 2-D field for filtering, including the column maximum value (COMPUTE_COLUMN_MAX) or vertically integrated liquid (COMPUTE_VIL)

Spatial Filtering

• spatial_filter_wavelength_km: wavelength of the spatial filter applied (km)

Data output

• output_url: path where the output files are written to
• filtered_field_name: name of the filtered field to write to MDV files

Running ScaleSep

To check all command line options for ScaleSep, including debugging options and file paths, type the following command into a terminal.

/path/to/lrose/install/bin/ScaleSep -h

Once your parameter file is complete, use a command similar to the following to run the application:

/path/to/lrose/install/bin/ScaleSep -params param_file_name

The user can also specify the location of cfradial files in the following manner:

/path/to/lrose/install/bin/ScaleSep -f /path/to/cfradial/files/ -params param_file_name