Second attempt - first seems to have got stuck ________________________________________ From: Lowry, Roy K. Sent: 18 March 2014 21:11 To: cf-metadata@cgd.ucar.edu Cc: gilbert.maud...@ifremer.fr Subject: 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. This message (and any attachments) is for the recipient only. NERC is subject to the Freedom of Information Act 2000 and the contents of this email and any reply you make may be disclosed by NERC unless it is exempt from release under the Act. Any material supplied to NERC may be stored in an electronic records management system. _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
