Re: [CF-metadata] inconsistencies in translating projection parameters OGC WKT <-> CF-1.5

2012-01-25 Thread Etienne Tourigny
I have submitted a trac ticket to deal with the definition/documentation issues mentioned in this thread: https://cf-pcmdi.llnl.gov/trac/ticket/75 regards, Etienne On Wed, Dec 21, 2011 at 7:12 PM, Etienne Tourigny wrote: > On Fri, Dec 16, 2011 at 10:11 PM, John Caron wrote: >> On 12/15/2011 8:

Re: [CF-metadata] inconsistencies in translating projection parameters OGC WKT <-> CF-1.5

2011-12-21 Thread Etienne Tourigny
On Fri, Dec 16, 2011 at 10:11 PM, John Caron wrote: > On 12/15/2011 8:03 AM, Etienne Tourigny wrote: > > John, thanks for your answers. > > Would anyone be kind enough to point me to real files that use the > projections mentioned in this thread? > > Answers below, but here is a quick summary of m

Re: [CF-metadata] inconsistencies in translating projection parameters OGC WKT <-> CF-1.5

2011-12-16 Thread John Caron
On 12/15/2011 8:03 AM, Etienne Tourigny wrote: John, thanks for your answers. Would anyone be kind enough to point me to real files that use the projections mentioned in this thread? Answers below, but here is a quick summary of my recommendations 1) LCC: calculate the missing scale_factor fr

Re: [CF-metadata] inconsistencies in translating projection parameters OGC WKT <-> CF-1.5

2011-12-16 Thread John Caron
On 12/15/2011 3:26 PM, Etienne Tourigny wrote: An update on LCC-1SP: I have modified the GDAL driver to compute scale_factor from CF parameters ( std_parallel and latitude_of_projection_origin), and keep the std_parallel1 (which is not OGC WKT for LCC-1SP), so it exports back to CF without a hit

Re: [CF-metadata] inconsistencies in translating projection parameters OGC WKT <-> CF-1.5

2011-12-15 Thread Etienne Tourigny
An update on LCC-1SP: I have modified the GDAL driver to compute scale_factor from CF parameters ( std_parallel and latitude_of_projection_origin), and keep the std_parallel1 (which is not OGC WKT for LCC-1SP), so it exports back to CF without a hitch. The only exception is translating from WKT t

Re: [CF-metadata] inconsistencies in translating projection parameters OGC WKT <-> CF-1.5

2011-12-15 Thread Etienne Tourigny
John, thanks for your answers. Would anyone be kind enough to point me to real files that use the projections mentioned in this thread? Answers below, but here is a quick summary of my recommendations 1) LCC: calculate the missing scale_factor from other parameters (no changes to CF) 2) CEA: d

Re: [CF-metadata] inconsistencies in translating projection parameters OGC WKT <-> CF-1.5

2011-12-14 Thread John Caron
Hi Etienne: Generally, CF has followed proj4 conventions as much as we could, and John Snyder's reference book is often underneath: http://pubs.usgs.gov/pp/1395/report.pdf OGC specs tended to come from experts using the EPSG, and generally we are less familiar with that. some specific comm

[CF-metadata] inconsistencies in translating projection parameters OGC WKT <-> CF-1.5

2011-12-13 Thread Etienne Tourigny
Hi all, I am opening a seperate thread at this deals merely with the problems encountered in translating projection parameters to/from OGC WKT and CF-1.5. I would appreciate any guidance in resolving these issues. In summary: 1) LCC (Lambert conformal): should include a scale_factor parameter i