Hi all, I would like to point out the following 3 tickets I have created in trac, regarding Projections and WKT (Well-Known Text) representation. The first two have been created 1 month ago and there has been almost no responses.
1) fix documentation and definitions of 3 grid mapping definitions https://cf-pcmdi.llnl.gov/trac/ticket/75 This has been discussed in the list: http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/027605.html It addresses some errors and confusion identified in the definitions of 3 projections. 2) Add sinusoidal projection https://cf-pcmdi.llnl.gov/trac/ticket/77 The sinusoidal projection is used in most of MODIS products. Only one response so far - Jonathan has approved it. 3) Add missing CF parameters to translate Coordinate Reference System properties to/from OGC Well-Known Text format https://cf-pcmdi.llnl.gov/trac/ticket/80 I created this ticket yesterday, and it has been discussed some time ago on this list: http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/027499.html With Jonathan's help I have come up with a proposal to add CF grid_mapping attributes that are missing to translate a projected or geographic coordinated system to/from OGC WKT. The following grid_mapping attributes would be added and described in Table F1 horizontal_datum_name towgs84 (a double-precision array, with 3, 6 or 7 values) prime_meridian_name reference_ellipsoid_name projected_coordinate_system_name geographic_coordinate_system_name I have also added substantial supporting documentation for CF/WKT translation at https://cf-pcmdi.llnl.gov/trac/wiki/Cf2CrsWkt This ticket is related to: https://cf-pcmdi.llnl.gov/trac/ticket/69 Ticket #69 is different, in that it allows to store the entire WKT string in a grid_mapping attribute. This ticket aims to by-pass the need for WKT representation in CF and the potential confusion, errors and inconsistencies that can result from multiple definitions (standard CF and the WKT). Any comments are welcome! Regards, Etienne _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata