Jcdehart: Created page with "ScaleSep separates a radar image into different spatial scales. === '''Overview''' === ScaleSep applies a filter in the 2-D fast Fourier transform frequency domain to separa..."

2021-06-29T17:55:10Z

Created page with "ScaleSep separates a radar image into different spatial scales. === '''Overview''' === ScaleSep applies a filter in the 2-D fast Fourier transform frequency domain to separa..."

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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:

<code lang="bash">/path/to/lrose/install/bin/ScaleSep -print_params > param_file_name</code>

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:

<code lang="bash">/path/to/lrose/install/bin/ScaleSep -params orig_param_file_name -print_params > new_param_file_name</code>

==== '''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.

<code lang="bash">/path/to/lrose/install/bin/ScaleSep -h</code>

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

<code lang="bash">/path/to/lrose/install/bin/ScaleSep -params param_file_name</code>

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

<code lang="bash">/path/to/lrose/install/bin/ScaleSep -f /path/to/cfradial/files/ -params param_file_name</code>

ScaleSep - Revision history

Jcdehart: Created page with "ScaleSep separates a radar image into different spatial scales. === '''Overview''' === ScaleSep applies a filter in the 2-D fast Fourier transform frequency domain to separa..."