Why are user specified lat/lon limits in grid exagerated by pyrad

[wolfidan]

Hi @jfigui

What is the reason for these two lines in plots_grid.py?

lon_lines = np.arange(np.floor(min_lon), np.ceil(max_lon)+1, lonstep)
lat_lines = np.arange(np.floor(min_lat), np.ceil(max_lat)+1, latstep)

This leads to a domain that is far too big if you are interested in more local features, for example setting

lonmin FLOAT 7.4 # Min longitude [deg] lonmax FLOAT 8.4 # Max longitude [deg] latmin FLOAT 46.4 # Min latitude [deg] latmax FLOAT 47.1 # Max latitude [deg]

in the loc config file will give limits of 46-48.5 and 7.0-9.5 in the plots which is much larger. Thanks

[wolfidan]

I personally would change that to

lon_lines = np.arange(min_lon, max_lon+lonstep, lonstep)
lat_lines = np.arange(min_lat, max_lat + latstep, latstep)

[jfigui]

Hi @wolfidan , There was no particular reason except that you have to give some marging on the limits. The proposed solution within pyart is this one:

        if lon_lines is None:
            lon_lines = np.linspace(
                np.around(ds.lon.min()-.1, decimals=2),
                np.around(ds.lon.max()+.1, decimals=2), 5)

        if lat_lines is None:
            lat_lines = np.linspace(
                np.around(ds.lat.min()-.1, decimals=2),
                np.around(ds.lat.max()+.1, decimals=2), 5)

It probably helps avoiding steps that are too small.

[wolfidan]

Ok I think it makes sense, we can close the issue for now