netcdf {
// Example 6
// An aggregation data variable for a collection of discrete sampling geometry
// timeseries features that have been compressed by use of a contiguous ragged
// array. The three timeseries of air temperature are each from different
// geographical locations and comprise four, five, and six observations
// respectively, giving a total of fifteen observations. The timeseries from
// each location is stored in a separate external file.
dimensions:
// Aggregated dimensions
station = 3 ;
obs = 15 ;
// Fragment dimensions
f_station = 3 ;
// Extra dimensions
i = 1 ;
j = 3 ;
variables:
// Data variable
float temp(obs) ;
temp:standard_name = "air_temperature" ;
temp:units = "Celsius" ;
temp:coordinates = "time lat lon alt station_name" ;
temp:aggregated_dimensions = "obs" ;
temp:aggregated_data = "location: aggregation_location
file: aggregation_file
format: aggregation_format
address: aggregation_address_temp" ;
// Coordinate variables
float time ;
time:standard_name = "time" ;
time:long_name = "time of measurement" ;
time:units = "days since 1970-01-01" ;
temp:aggregated_dimensions = "obs" ;
temp:aggregated_data = "location: aggregation_location
file: aggregation_file
format: aggregation_format
address: aggregation_address_time" ;
float lon(station) ;
lon:standard_name = "longitude";
lon:long_name = "station longitude";
lon:units = "degrees_east";
temp:aggregated_dimensions = "obs" ;
temp:aggregated_data = "location: aggregation_location_latlon
file: aggregation_file
format: aggregation_format
address: aggregation_address_lon" ;
float lat(station) ;
lat:standard_name = "latitude";
lat:long_name = "station latitude" ;
lat:units = "degrees_north" ;
temp:aggregated_dimensions = "obs" ;
temp:aggregated_data = "location: aggregation_location_latlon
file: aggregation_file
format: aggregation_format
address: aggregation_address_lat" ;
// Compression encoding variable
int row_size(station) ;
row_size:long_name = "number of observations per station" ;
row_size:sample_dimension = "obs" ;
// Aggregation definition variables
int aggregation_location(i, j) ;
int aggregation_location_latlon(i, j) ;
string aggregation_file(f_station) ;
string aggregation_format ;
string aggregation_address_temp(f_station) ;
string aggregation_address_time(f_station) ;
string aggregation_address_lat(f_station) ;
string aggregation_address_lon(f_station) ;
// global attributes:
:Conventions = "CF-1.9 CFA-0.6" ;
:featureType = "timeSeries";
data:
temp = _ ;
time = _ ;
row_size = 4, 5, 6 ;
aggregation_location = 3, 4, 5 ;
aggregation_location_latlon = 1, 1, 1 ;
aggregation_file = "Harwell.nc", "Abingdon.nc", "Lambourne.nc" ;
aggregation_format = "nc" ;
aggregation_address_temp = "tas", "tas", "tas" ;
aggregation_address_time = "time", "time", "time" ;
aggregation_address_lat = "lat", "lat", "lat" ;
aggregation_address_lon = "lon", "lon", "lon" ;
}
