Re: [ferret_users] plots in grads or ferret

[Steve Hankin <steven.c.hankin@xxxxxxxx>]

Nitin,

The procedure is very similar for all 3 cases.  Assuming that you are staring with a well-formed time axis for your IMD daily rainfall (i.e. when you plot the rainfall, the time axis tics are labeled with days/months/years, rather than simply numbers), then here in a nutshell are the steps to follow for your #2 (monthly extrema):

1. define a monthly calendar axis using the steps shown at http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/commands-reference/DEFINE#_VPINDEXENTRY_1310
   Say, you name your newly defined axis "tmonthly"
   
2. regrid your daily data to this new monthly axis using gt=@min or gt=@max as described at http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/Grids-Regions/GRIDS#_VPINDEXENTRY_677
   
   e.g.
   yes?  LET monthly_max = myrainfall[gt=tmonthly@max]
   yes? PLOT monthly_max
   

    - Steve

On 2/2/2012 10:13 PM, nitin patil wrote:

Dear all,
              Did any one knows how to find
1. daily annual maxima and minima
2. monthly annual maxima and minima
3. seasonal (JJAS) annual maxima and minima
and rainfall extremes
all in spatial plots

using IMD daily rainfall (2001 to 2005)

--
Regards,
Mr. Nitin Patil