Re: [ferret_users] white space in latitude-time cross-section plot (Hovemuller plot)

[Oluwaseun Ilori <wilseun@xxxxxxxxx>]

Thanks Ryo for the clarification and I will try it out, before then I think I should mention this here. The data is climatological monthly mean data gotten from cdo (ymonmean) operator on 55 years monthly data. The output (ymonmean_REMO.nc) now contains 12 months of data (Jan-Dec) that I needed to examine latitudinal variation from January to December.

Thanks once again for your help and I will try your suggestion and get back to you. 

On Fri, May 8, 2020, 2:15 PM Ryo Furue <furue@xxxxxxxxxx> wrote:

Dear Oluwaseun,

If your time axis is annual climatology (that is, if it repeats itself every year), it should be defined as "modulo".  Then, you can avoid these white bands by extending the data beyond the beginning and end of the year, as in

fill/hlimits=0:365/ . . . pr[t=-40:400, . . .]

if the underlying units of time is "days" and if your climatological year consists of 365 days.  Basically, you limit the region of plotting to one year, but ask Ferret to take values before and after the year into account when generating contour lines (shadings).  Having said that, I'm not too familiar with this issue and I would always need some trial and error before I get the right results.

To see what time axis your data has, you want to see the outputs of these commands:

yes? show grid pr

yes? list t[gt=pr]

Hope this helps.

Ryo