netcdf {
// Example 5
// An aggregated data variable and an aggregated coordinate variable in the
// same dataset. There are two external netCDF files, each of which contains a
// fragment for each aggregation variable. The aggregation definition
// variables for each aggregation variable are stored in different groups
// (aggregation_temp and aggregation_time), but the file terms of the
// aggregated_data attributes refer to a variable in the root group that
// stores the external file names that apply to both aggregation variables.
dimensions:
// Aggregated dimensions
time = 12 ;
level = 1 ;
latitude = 73 ;
longitude = 144 ;
// Fragment dimensions
f_time = 2 ;
f_level = 1 ;
f_latitude = 1 ;
f_longitude = 1 ;
// Extra dimensions
i = 4 ;
ii = 1 ;
j = 2 ;
variables:
// Data variable
double temp ;
temp:standard_name = "air_temperature" ;
temp:units = "K" ;
temp:cell_methods = "time: mean" ;
temp:aggregated_dimensions = "time level latitude longitude" ;
temp:aggregated_data = "location: /aggregation_temp/location
file: /aggregation_temp/aggregation_file
format: aggregation_format
address: /aggregation_temp/address" ;
// Coordinate variables
double time ;
time:standard_name = "time" ;
time:units = "days since 2001-01-01" ;
temp:aggregated_dimensions = "time" ;
temp:aggregated_data = "location: /aggregation_time/location
file: /aggregation_time/file
format: agregation_format
address: /aggregation_time/address" ;
double level(level) ;
level:standard_name = "height_above_mean_sea_level" ;
level:units = "m" ;
double latitude(latitude) ;
latitude:standard_name = "latitude" ;
latitude:units = "degrees_north" ;
double longitude(longitude) ;
longitude:standard_name = "longitude" ;
longitude:units = "degrees_east" ;
// Aggregation definition variables
string aggregation_format ;
// global attributes:
:Conventions = "CF-1.9 CFA-0.6" ;
data:
temp = _ ;
time = _ ;
aggregation_format = "nc" ;
group: aggregation_temp {
variables:
// Temperature aggregation definition variables
int location(i, j) ;
string file(f_time, f_level, f_latitude, f_longitude) ;
string address(f_time, f_level, f_latitude, f_longitude) ;
data:
location = 6, 6,
1, _,
73, _,
144, _ ;
file = "January-June.nc", "July-December.nc" ;
address = "temp", "temp" ;
}
group: aggregation_time {
variables:
// Time aggregation definition variables
int location(ii, j) ;
string aggregation_file(f_time) ;
string address(f_time) ;
data:
location = 6, 6 ;
aggregation_file = "January-June.nc", "July-December.nc" ;
address = "time", "time" ;
}
}
