Dear Dr. Schmunk, dear CF experts,
I'm wondering if CF concentions say anything about the grouping within a
netCDF4 file, and if PanoplyJ can handle files with different groups? I
couldn't find anything in the documentation, but wanted to make sure.
I'm having issues using PanoplyJ
(
http://www.giss.nasa.gov/tools/panoply/) with a file where data and
coordinate variables are in different groups. For example, the data
variable of this file cannot be plotted with Panoply:
---8<-------
dimensions:
lon = 5760 ;
lat = 2880 ;
time = UNLIMITED ; // (204 currently)
nv = 2 ;
group: coordinates {
variables:
double lon(lon) ;
lon:standard_name = "longitude" ;
lon:units = "degrees_east" ;
lon:bounds = "lon_bnds" ;
double lon_bnds(lon, nv) ;
double lat(lat) ;
lat:standard_name = "lat" ;
lat:units = "degrees_north" ;
lat:bounds = "lat_bnds" ;
double lat_bnds(lat, nv) ;
int time(time) ;
time:standard_name = "time" ;
time:units = "hours since 1994-01-01 00:00:00 +0:00" ;
time:calendar = "gregorian" ;
time:bounds = "time_bnds" ;
int time_bnds(time, nv) ;
} // group coordinates
group: data {
group: VCDtrop_NO2 {
group: SCIAMACHY {
variables:
float sciamachy_vcdtrop-no2_v4(time, lon, lat) ;
sciamachy_vcdtrop-no2_v4:_FillValue = NaNf ;
sciamachy_vcdtrop-no2_v4:least_significant_digit = 5L ;
} // group SCIAMACHY
} // group VCDtrop_NO2
} // group data
}
---8<-------
However, when collapsed so that all variables are in the rootgrp, the
file is plotted correctly:
---8<-------
dimensions:
lon = 5760 ;
nv = 2 ;
lat = 2880 ;
time = UNLIMITED ; // (204 currently)
variables:
double lon(lon) ;
lon:standard_name = "longitude" ;
lon:units = "degrees_east" ;
lon:bounds = "lon_bnds" ;
double lon_bnds(lon, nv) ;
double lat(lat) ;
lat:standard_name = "lat" ;
lat:units = "degrees_north" ;
lat:bounds = "lat_bnds" ;
double lat_bnds(lat, nv) ;
int time(time) ;
time:standard_name = "time" ;
time:units = "hours since 1994-01-01 00:00:00 +0:00" ;
time:calendar = "gregorian" ;
time:bounds = "time_bnds" ;
int time_bnds(time, nv) ;
double sciamachy_vcdtrop-no2_v4(time, lon, lat) ;
sciamachy_vcdtrop-no2_v4:_FillValue = NaN ;
sciamachy_vcdtrop-no2_v4:least_significant_digit = 5L ;
---8<-------
So my question is: is this a bug in PanoplyJ, or is Panoply doing the
right thing and I don't understand the CF conventions correctly?
Your help is greatly appreciated!
Andreas.
-- Andreas.
Received on Sun May 19 2013 - 09:50:34 BST
