Hi all, The CF conventions define a means to specify the datum used in certain map projections (http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.ht ml#grid-mappings-and-projections). In the (common) case of a data file containing latitude and longitude axes, but no explicit datum specification, which datum should be assumed? Spherical Earth? WGS84?
The horizontal error resulting from use of an incorrect datum can be significant for high-resolution and/or local dataset (hundreds of metres). Cheers, Jon -- Dr Jon Blower Technical Director, Reading e-Science Centre Environmental Systems Science Centre University of Reading Harry Pitt Building, 3 Earley Gate Reading RG6 6AL. UK Tel: +44 (0)118 378 5213 Fax: +44 (0)118 378 6413 [email protected] http://www.nerc-essc.ac.uk/People/Staff/Blower_J.htm _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
