OSI-SAF surface radiation file missing time
Added by Theodoros Gkousarov almost 10 years ago
Hi all,
I have this file from OSI-SAF with 5 variables, but time is missing. So when i m trying to mergetime 6 different files into 1... the netcdf file created contains only one image with no timestamp on it.
File attached, every help welcomed.
Replies (4)
RE: OSI-SAF surface radiation file missing time - Added by Uwe Schulzweida almost 10 years ago
Try it with the CDO operator cat.
RE: OSI-SAF surface radiation file missing time - Added by Theodoros Gkousarov almost 10 years ago
Thanks Uwe.
It did merge, but the time is missing and I cant open it since it doesnt appear to be a CF netcdf :/.
Actually, is it possible to set the time in these netcdf, based on their filename?
RE: OSI-SAF surface radiation file missing time - Added by Uwe Schulzweida almost 10 years ago
The next CDO version will read the time directly from the time variable. You can test it with the prereleased CDO version in https://code.zmaw.de/projects/cdo/files.
RE: OSI-SAF surface radiation file missing time - Added by Theodoros Gkousarov almost 10 years ago
Thanks Uwe,
prereleased cdo versio you mean the one for 18th June?
Meanwhile this is the response from OSI-SAF regarding the time.
The OSI SAF hourly flux products are pseudo instantaneous products, where all pixels have the same time.
There is a time variable in the netcdf:
double time ;
time:long_name = "reference time" ;
time:standard_name = "time" ;
time:units = "seconds since 1981-01-01 00:00:00" ;
time:_FillValue = -9999999. ;
time:comment = "" ;
This variable is scalar. Maybe it is the reason why you don't see it easily with your tools.
The time information is also contained in the name of the netcdf file yyyymmddhhmnss-OSISAF-RADFLX*
with yyyy=year mm=month dd=day hh=hour mn=minute ss=second
The interpolation at rounded UT hours is explained in section 4 of the Geostationary Radiative Flux (Products OSI-303, 304, 305, 306) Product User Manual, available on http://www.osi-saf.org