Hi. NAVD88 is a geoid adjusted to geodetic leveling measurements taken all over North America and fixed to the “mean sea level” height at Rimouski, Quebec, Canada. (http://en.wikipedia.org/wiki/North_American_Vertical_Datum_of_1988)
Jim Visit us on Facebook Jim Biard Research Scholar Cooperative Institute for Climate and Satellites NC North Carolina State University NOAA's National Climatic Data Center 151 Patton Ave, Asheville, NC 28801 e: jbi...@cicsnc.org o: +1 828 271 4900 On Feb 6, 2014, at 11:47 AM, Jonathan Gregory <j.m.greg...@reading.ac.uk> wrote: > Dear Rich > >> Yes, I think your answer before is the answer now, but I'm just clear >> on the details. Would you specify sea_surface_height above NAVD88 >> like this? >> >> float zeta(y=1534, x=2122); >> :standard_name = "sea_surface_height_above_reference_datum"; >> :grid_mapping = "Albers_Projection"; >> >> int Albers_Projection; >> :grid_mapping_name = "albers_conical_equal_area"; >> :standard_parallel = 20.5, 27.5; // double >> :longitude_of_central_meridian = -89.0; // double >> :latitude_of_projection_origin = 24.0; // double >> :false_easting = 0.0; // double >> :false_north = 0.0; // double >> :vertical_datum = 'urn:ogc:def:datum:epsg::5103' > > I'm not clear still what NAVD88 is though. SSH must be above some surface. Is > this surface a reference ellipsoid or a geoid? These are two different > standard > names: > sea_surface_height_above_geoid > sea_surface_height_above_reference_ellipsoid > whereas sea_surface_height_above_reference_datum is not an existing stdname. > > If it's a reference ellipsoid, it can be described already by grid_mapping > parameters. To name a geoid, we'd need a new attribute of grid_mapping, but > I don't think that would be problematic. > > Best wishes > > Jonathan > _______________________________________________ > CF-metadata mailing list > CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
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