Consecutive numbers without rain
Added by Guilherme Martins almost 8 years ago
Hi cdo users,
I'm trying to calculte the consecutive numbers without rain using the values less than 1 mm/day.
My file input is: tmp.nc and the output is: a1.nc
I've used the command below to do that:
cdo -consects -lec,1 tmp.nc a1.nc
But I want only the first ocurrence and not all values like the result below:
-1 : Date Time Level Gridsize Miss : Minimum Mean Maximum : Parameter name
1 : 2015-01-01 12:00:00 0 1 1 : nan : prec
2 : 2015-01-02 12:00:00 0 1 1 : nan : prec
3 : 2015-01-03 12:00:00 0 1 1 : nan : prec
4 : 2015-01-04 12:00:00 0 1 1 : nan : prec
5 : 2015-01-05 12:00:00 0 1 1 : nan : prec
6 : 2015-01-06 12:00:00 0 1 0 : 4.0000 : prec <== I want only this value, that is, only the firs ocurrence.
7 : 2015-01-07 12:00:00 0 1 1 : nan : prec
8 : 2015-01-08 12:00:00 0 1 1 : nan : prec
9 : 2015-01-09 12:00:00 0 1 1 : nan : prec
10 : 2015-01-10 12:00:00 0 1 1 : nan : prec
11 : 2015-01-11 12:00:00 0 1 1 : nan : prec
12 : 2015-01-12 12:00:00 0 1 1 : nan : prec
13 : 2015-01-13 12:00:00 0 1 0 : 1.0000 : prec
14 : 2015-01-14 12:00:00 0 1 1 : nan : prec
15 : 2015-01-15 12:00:00 0 1 1 : nan : prec
16 : 2015-01-16 12:00:00 0 1 0 : 2.0000 : prec
17 : 2015-01-17 12:00:00 0 1 1 : nan : prec
18 : 2015-01-18 12:00:00 0 1 1 : nan : prec
19 : 2015-01-19 12:00:00 0 1 0 : 2.0000 : prec
20 : 2015-01-20 12:00:00 0 1 1 : nan : precCheers,
Guilherme Martins.
Replies (2)
RE: Consecutive numbers without rain - Added by Ralf Mueller almost 8 years ago
What about the eca_cdd (Consecutive dry days index per time period)
ram@luthien:~ cdo -h eca_cdd [12:54:40|16-12-06]
NAME
eca_cdd - Consecutive dry days index per time period
SYNOPSIS
eca_cdd[,R[,N]] ifile ofile
DESCRIPTION
Let ifile be a time series of the daily precipitation amount RR, then the largest number
of consecutive days where RR is less than R is counted. R is an optional parameter with
default R = 1 mm. A further output variable is the number of dry periods of more than N days.
The date information of a timestep in ofile is the date of the last contributing timestep in ifile.
The following variables are created:
- consecutive_dry_days_index_per_time_period
- number_of_cdd_periods_with_more_than_<N>days_per_time_period
PARAMETER
R FLOAT Precipitation threshold (unit: mm; default: R = 1 mm)
N INTEGER Minimum number of days exceeded (default: N = 5)
RE: Consecutive numbers without rain - Added by Guilherme Martins almost 8 years ago
Hi Ralf,
Perfect!
Thanks a lot!
Guilherme.