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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Don Joe Sirott wrote:
Hi John,There are a lot of legacy oceanographic in-situ datasets out there that use the EPIC netCDF convention <http://www.epic.noaa.gov/epic/document/convention.htm> which in turn recommends use of "degree_west" (note the missing "s") for the longitude units attribute.I've found that you need support the 8 combinations (degree_west, degrees_west, ...) of lat/lon unit attributes in order to reliably handle these kind of datasets. In practice, EPIC datasets are even more complicated as there is an "epic_code" attribute that independently specifies the units for the variable. Some datasets only have the epic_code attribute, some have both, and some (as yet another proof of Murphy's Law) have an epic_code attribute that conflicts with the units attribute.It would be great (at least for me!) if netCDF-java supported all of these attributes. However, I don't think they should be added to CF, as this would make CF even more complicated than it already is and I think that most data providers should be encouraged to use the degrees_east/degrees_north convention.- Joe John Caron wrote:Tom Whittaker wrote:We have some point data that has positive-west longitude values. It appears that netcdf-java (and perhaps the CF conventions) do not support a unit of "degrees_west". This seems inconsistent, since degrees_east is supported. While I assume we can work arround this by adding a scale_factor attribute with a -1.0 value, I would encourage you to consider this as a valid unit. (I also wonder if "degrees_south" are recognized? I did not check this.....) Thanks.....Hi Tom:CF does not recognize degrees_west (nor degrees_south). You could propose adding that to CF, which would be the best easy to solve it from our POV.One thing that complicates it is that degrees_north, degrees_east units is the way to recognize lat/lon coordinates. so now degrees_west, degees_south would also be.Can you give me some background on what datasets are likely to be using these units?_______________________________________________ netcdf-java mailing list netcdf-java@xxxxxxxxxxxxxxxxFor list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/------------------------------------------------------------------------ _______________________________________________ netcdf-java mailing list netcdf-java@xxxxxxxxxxxxxxxxFor list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
-- ************************************************************* Don Murray UCAR Unidata Program dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000 (303) 497-8628 Boulder, CO 80307 http://www.unidata.ucar.edu/staff/donm *************************************************************
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