I am considering a file from a sampling system that follows a trajectory, but
which collects each variable independently of each other. It would have with a
header that looks like the following (adapted from "Example H.13. A single
trajectory recording atmospheric composition."):
dimensions:
time_lon = 42;
time_lat = 55;
time_z = 435;
time_O3 = 335;
time_NO3 = 5357;
variables:
double time_lon(time_lon) ;
time_lon:standard_name = "time";
time_lon:long_name = "time_lon" ;
time_lon:units = "days since 1970-01-01 00:00:00" ;
float lon(time_lon) ;
lon:standard_name = "longitude";
lon:long_name = "longitude" ;
lon:units = "degrees_east" ;
double time_lat(time_lat) ;
time_lat:standard_name = "time";
time_lat:long_name = "time_lat" ;
time_lat:units = "days since 1970-01-01 00:00:00" ;
float lat(time_lat) ;
lat:standard_name = "latitude";
lat:long_name = "latitude" ;
lat:units = "degrees_north" ;
double time_z(time_z) ;
time_z:standard_name = "time";
time_z:long_name = "time_z" ;
time_z:units = "days since 1970-01-01 00:00:00" ;
float z(time_z) ;
z:standard_name = “altitude”;
z:long_name = "height above mean sea level" ;
z:units = "km" ;
z:positive = "up" ;
z:axis = "Z" ;
double time_O3(time_O3) ;
time_O3:standard_name = "time";
time_O3:long_name = "time_O3" ;
time_O3:units = "days since 1970-01-01 00:00:00" ;
float O3(time_O3) ;
O3:standard_name = “mass_fraction_of_ozone_in_air”;
O3:long_name = "ozone concentration" ;
O3:units = "1e-9" ;
O3:coordinates = "time_O3 lon lat z" ;
double time_NO3(time_NO3) ;
time_NO3:standard_name = "time";
time_NO3:long_name = "time_NO3" ;
time_NO3:units = "days since 1970-01-01 00:00:00" ;
float O3(time_NO3) ;
NO3:standard_name = “mass_fraction_of_nitrate_radical_in_air”;
NO3:long_name = "NO3 concentration" ;
NO3:units = "1e-9" ;
NO3:coordinates = "time_NO3 lon lat z" ;
attributes:
:featureType = "????";
The data points could be sampled to generate a header exactly like the example
from the standard, but in doing so, one would lose information about the timing
of each variable's values, and would either end up with data loss, or a much
larger file. So I'm wondering: is this a valid "H.4.2. Single trajectory"? If
not, is it something that can be annotated as a valid CF metadata file without
altering the measured data?
Thanks, Mike Godin
_______________________________________________
CF-metadata mailing list
[email protected]
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
