Difference between selmonth, seldate and select
Added by Bérénice Ferrand almost 2 years ago
My question is : what is the difference between all this command line ?
I need to use this kind of command and I tried all of this and I don't have the same result at the end. To be sure of what I do I prefer ask. (don't pay attention of the name of input and output)
cdo.selmonth('09/11', input=infile, output="mrros_1850-2014.nc")cdo.seldate('1850-01-01,2014-12-31', input='-selmonth,09,10,11 '+infile, output='mrros_1850-2014.nc')cdo.seldate('1850-09-01,2014-12-31', input=infile, output="mrros_1850-2014_0.nc")
cdo.selmonth('09,10,11', input="mrros_1850-2014_0.nc", output="mrros_1850-2014.nc")cdo.select('startdate=1850-09-01,enddate=2014-11-31', input='-select,season=SON '+infile, output='mrros_1850-2014.nc')After this, I used : cdo.sellonlatbox, cdo.fldsum, cdo.detrend, cdo.yearmean
Replies (3)
RE: Difference between selmonth, seldate and select - Added by Karin Meier-Fleischer almost 2 years ago
1. select the months September, October, November from input file 2. a. select the months September, October, November from input file b. pipe output to seldate operator to select time range 1850-01-01,2014-12-31 3. same as 2. but in two steps 4. same as 2. but with the select operator instead of seldate
See documentation
selmonth: https://code.mpimet.mpg.de/projects/cdo/embedded/cdo.pdf#subsection.2.3.4 seldate: https://code.mpimet.mpg.de/projects/cdo/embedded/cdo.pdf#subsection.2.3.4 select: https://code.mpimet.mpg.de/projects/cdo/embedded/cdo.pdf#subsection.2.3.1
RE: Difference between selmonth, seldate and select - Added by Bérénice Ferrand almost 2 years ago
Thanks for the precision but why I have something different each time ?
| figu1_09_11.png (57.5 KB) figu1_09_11.png | |||
| fig1_09_11_2.png (39.6 KB) fig1_09_11_2.png | |||
| fig1_09_11_3.png (50.3 KB) fig1_09_11_3.png | |||
| fig1_09_11.png (40.4 KB) fig1_09_11.png |
RE: Difference between selmonth, seldate and select - Added by Karin Meier-Fleischer almost 2 years ago
In our tests the results are always the same, there are no is no differences.
Check the computed results from above with
cdo diff infile1 infile2
Your attached plots show 'ocean surface temperature' plotted against 'surface runoff' with different x-axis ranges. But to compare computed results you should take a look only at the computed data itself. Do you use the same time step for the 4 plots?