CODAR Real time Long range vector fields

CODAR is used to measure the surface currents of the coastal ocean. A
transmitter sends out a radio frequency that bounces off the ocean
surface and back to a receiver antenna. Using this information and the
principles of the Doppler shift, CODAR is able to calculate the speed
and direction of the surface current. These calculations are made at
about every half mile across the surface and extend as far as about
twenty miles offshore.

The following Data is available online:

Raw Vector Field: The raw surface current is the unprocessed data
measured by CODAR. Therefore these velocity fields are the summation
of all sources of current, including tides and wind.

Tidal Vector Field: This vector field represents the component of the
raw velocity that is caused by tidal forcing.

Detided Vector Field: The detided vector field contains all the
surface currents shown in the raw velocity field with the exception of
the tidal currents. Using the above periods, a predicted tide is
calculated and then subtracted from the raw data field.

Averaged Vector Field : The Averaged vector field is a 36 hour average
of the detided field.

Inertial Vector Field: The inertial vector field is calculated using a
least squares fit to the detided data over the most recent 36 hours.