Changes between Version 55 and Version 56 of NetCDF_exportUpdateChanges


Ignore:
Timestamp:
Oct 21, 2011, 1:01:42 AM (13 years ago)
Author:
pds
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • NetCDF_exportUpdateChanges

    v55 v56  
    113113While GDAL uses the OGC Well Known Text (WKT) format internally to store datasets' Spatial Reference Systems (SRS), the CF-1 conventions use a custom system based on a special 'grid_mapping' NetCDF variable with a set of projection attributes, and also Coordinate variables for both the projected coordinates and latitude and longitude. See [[http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.5/ch05s06.html CF1.5 ch5.6]] for an explanation and examples, and [[http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.5/apf.html CF1.5 App F]] for a list of supported projections.
    114114
    115 Unfortunately, the CF-1 conventions do not currently allow saving of all data needed for a fully georeferenced SRS, such as Named datums and EPSG codes. For background on this, see CF convention trac tickets [[https://cf-pcmdi.llnl.gov/trac/ticket/9 #9]], [[https://cf-pcmdi.llnl.gov/trac/ticket/18 #18]], [[https://cf-pcmdi.llnl.gov/trac/ticket/27 #27]] and more recent [[https://cf-pcmdi.llnl.gov/trac/ticket/69 #69]].
     115Unfortunately, the CF-1 conventions do not currently allow saving of all data needed for a fully georeferenced SRS, such as Named datums and EPSG codes. For background on this, see CF convention trac tickets [[https://cf-pcmdi.llnl.gov/trac/ticket/9 #9]], [[https://cf-pcmdi.llnl.gov/trac/ticket/18 #18]], [[https://cf-pcmdi.llnl.gov/trac/ticket/27 #27]] and more recent [[https://cf-pcmdi.llnl.gov/trac/ticket/69 #69]] - and recent mailing list threads like [[http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/012937.html here]].
    116116
    117117The proposed changes in this section update the NetCDF driver when exporting to NetCDF to: