Creating scenarios

To create scenarios, the -db, -n, -t, and -o flags must be specified:

• -db specifies a NetCDF database to sample from
• -n specifies how many scenarios to create
• -t specifies how long (in number of days) the scenarios should be
• -o specifies what file to store the scenarios in

For example, the following command:

wxgen sim -db db.nc -n 21 -t 365 -o sim.nc

creates 21 simulations that each are 365 days long. The results are stored in sim.nc.

For a complete list of options, run wxgen sim without arguments:

wxgen sim

Output scale

By default, aggregated values are written. To create gridded output, use the -s flag (scale). -s has three options:

• The default value "agg" specifies aggregated output (one value for the whole domain)
• "large" specifies large scale, which is the same resolution as the input database
• "small" specifies downscaled values (not yet implemented).

wxgen sim -db db.nc -n 21 -t 365 -o sim.nc -s agg

The -s agg option is useful when you want to test the verification system in Wxgen, since the files are must smaller.