Hi Charles, It looks like the standard names such as "sea_water_y_velocity" suit your needs? Although there seem to be less "y" names than "northward" names, so you may find you need to request some additional names.
Richard Hattersley Iris Benevolent Dictator Met Office FitzRoy Road Exeter Devon EX1 3PB United Kingdom Tel: +44 (0)1392 885702 Email: [email protected] Web: www.metoffice.gov.uk -----Original Message----- From: CF-metadata [mailto:[email protected]] On Behalf Of Charles Seaton Sent: 07 February 2013 02:55 To: [email protected] Cc: Tuomas Karna Subject: [CF-metadata] directional data in a projected coordinate system Hello all, We are in the process of switching standard model output at CMOP over to CF compliant netcdf. As we do so, we are looking at whether we can retain our data in projected coordinates or whether we need to switch to using global lat-lon coordinates. We have run into an ambiguity in the handling of directional data in a projected coordinate system in CF. If I have model output velocities generated in a projected coordinate system, should velocity data that is relative to the projected coordinate system? Take the canonical lambert conformal conic example (example 5.7 at http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.0/ch05s06.html). If I add a variable: float VelN(time, y, x); VelN:standard_name ="northward_sea_water_velocity" VelN:coordinates="lat lon"; VelN:grid_mapping = "Lambert_Conformal"; would it then be understood (by CF compliant software) that this is the y-component of velocity within the context of the projection, which will differ from the true Northward component of velocity at most points within the projection? Or does using the name "northward_X" mean that the velocity should be the true Northward component of velocity? thanks, Charles Seaton Research Associate Center for Coastal Margin Observation and Prediction (CMOP) Oregon Health and Science University [email protected] _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
