Don't know where this suddenly came from - I sent it on March 18! It's content is somewhat out of date.
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From: Lowry, Roy K. [rkl at bodc.ac.uk]
Sent: 18 March 2014 21:11
To: cf-metadata at cgd.ucar.edu
Cc: gilbert.maudire at ifremer.fr
Subject: [CF-metadata] SeaDataNet and ADCP data
Dear All (especially John Caron),
We're currently extending the SeaDataNet NetCDF standard - a profile of CF1.6 - to cover vessel-mounted ADCP and other profileTrajectory data (e.g. towed thermistor chains). Two issues have arisen.
1) For a ship, VMADCP have profiles of current parameters for each point on the trajectory. However, there are sometimes other single-depth parameters such as the seabed current easting and northing from bottom tracking. These could be carried as geophysical variables with a dimension (INSTANCE, TIME), but is it OK to mix these into a profileTrajectory file or would it be better to have two separate files, one with the 2D currents and one with the 3D? A similar issue arises with bottom temperature and sea level data returned by moored ADCPs. Any views?
2) We now have ADCPs fitted to AUVs. This means that the 'profile' z co-ordinates vary along the time dimension. On way around this might be to set the z co-ordinate of the profiles to be offset from the platform depth and then have the platform depth as a data value along the TIME dimension. Alternatively, we could add a TIME dimension to depth, which I'm guessing would be a new feature type.
Feedback/guidance on thsi would be much appreciated.
Cheers, Roy.
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Received on Fri Nov 07 2014 - 07:07:00 GMT
