SeaDataNet NetCDF format, MyOcean contribution

NetCDF data file examples

Vertical profile in-situ observations

The following example contains 2 vertical profiles from Pheidippides glider.
Each profile contains pressure, temperature, salinity and oxygen observations.

 

Trajectory in-situ observations

The following example contains one day of thermosalinograph data from Thalassa research vessel.
Each observation contains temperature, salinity, conductivty and tsg tank temperature.
The depth is reported as 5 meters.

 

Time-series in-situ observations

The following example contains one month of observations from CIS-1 mooring (Central Irminger Sea).
There are 15 profiles of 12 levels having temperature, salinity, conductivity and pressure measurements.

 

 

Important features for in-situ data

Vertical axes management

Here are the essential features used by MyOcean and OceanSITES to manage vertical profiles.

Four dimensions

  • time = unlimited
  • depth = 100

Four axes

  • double time(time)
    time:axis = "T" ;
  • float depth(depth)
    depth:axis = "Z" ;
  • float latitude(time)
    latitude:axis = "Y"
  • float longitude(time)
    latitude:axis = "X"

Many variables

  • float DataVariable(time, depth)
    coordinates = "time depth latitude longitude";

 

Links between variables and their associated QC

The variable attribute ancillary_variables links a variable to its associated QC.

  • TIME:ancillary_variables = "TIME_QC" ;
    LATITUDE:ancillary_variables = "POSITION_QC" ;
    LONGITUDE:ancillary_variables = "POSITION_QC" ;
    PRES:ancillary_variables = "PRES_QC" ;
    DOX1:ancillary_variables = "DOX1_QC" ;
    PSAL:ancillary_variables = "PSAL_QC" ;
    TEMP:ancillary_variables = "TEMP_QC" ;

 

Global attributes

Different features

Dimensions for a single profile file with 100 levels:

  • featureType = profile
    (time, depth, latitude, longitude) = (1, 100, 1, 1)

Dimensions for a series of 5 profiles with 100 levels

featureType = trajectoryProfile
(time, depth, latitude, longitude) = (5, 100, 5, 5)

 

Vertical references

Vertical references globale attributes for a glider profiling between 2 and 1002 decibars.

  • :geospatial_vertical_min = "2" ;
    :geospatial_vertical_max = "1002" ;
    :geospatial_vertical_positive = "down" ;