This page was created to list/track progress as a supplement to work in October 2011 on wiki:NetCDF_Improvements, specifically wiki:NetCDF_exportUpdateChanges.

The list of supported CF-1.5 projections is shown at ​http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.5/apf.html .

Hopefully the shorthand projection names listed below are fairly self-explanatory - they've been listed in the same order as that shown on the CF-1.5 appendix page.

Projection	Export- CF compliance	Export - openable by NetCDF Java	Updated	Note
AEA	Yes	Yes	18/10/11	Tested regular 2SP version - see AEA note below.
AzEq	Yes	No	18/10/11	See (1) below
LAzEqA	Yes	Yes	18/10/11
LC-2SP	Yes	Yes	18/10/11	Tested 2SP version - CF-1 claims to have a 1SP version, but params quite different to OGC WKT so not tested. See note below.
LCEA	Yes	No	18/10/11	Tested regular OGC WKT with 1 std parallel version (CF-1 has alternative, see notes below). See (1) below re NetCDF-Java loading.
M-1SP	Yes	No	18/10/11	See (1) below
M-2SP	Yes	Yes*	18/10/11	Parameters appear correct, loads in NetCDF Java and IDV, but appears translated from expected position
Ortho	Yes	Yes	18/10/11
Polar St	Yes*	?	18/10/11	See projection comments below
Rot Pole	N	N	18/10/11	See projection comments below
St	Yes	Yes	18/10/11
TM	Yes	Yes	18/10/11

General notes:

(1) For projections that won't load correctly as referenced grids in NetCDF Java, we've contacted the developers to ask for clarification/testing support. In most cases, the CF-1 attributes seem appropriate.

Issues with CF-1 implementation of specific projections:

• AEA (Albers Equal Area): The OGC WKT version has 2 Std parallels - whereas the CF-1.5 version says it can have either 1 or 2 std parallels. How would the 2SP version be converted to a CF 1SP version, and vice-versa?
• LCC (Lambert Conformal Conic): The OGC WKT 'Lambert_Conformal_Conic_2SP' maps clearly to LC in CF-1 with 2 std parallels. The CF-1 spec claims that a 1SP version can be used, but it doesn't include a 'scale_factor' as does the OGC WKT 'Lambert_Conformal_Conic_1SP'. Is there a way to do this conversion?
• LCEA (Lambert Cylindrical Equal Area): The CF-1 conventions claim this can be encoded with a 'scale_factor_at_projection_origin' alternative to standard parallel - how would this conversion be done back from OGC WKT?
• Polar St (Polar Stereographic): This projection's parameters in CF-1 are quite unusual, and significantly different from ​http://www.remotesensing.org/geotiff/proj_list/polar_stereographic.html. In particular finding a CF-1 equivalent for 'latitude of natural origin' is proving difficult.
• Rot pole (Rotated Poke): Not able yet to test: as seems GDAL needs support of advanced proj4 strings that can handle rotated coord systems.