[gdal-dev] Projection issue with a netcdf file

[Kyle Shannon]

Frank,
I have been working on this issue for some time and the driver has a quirky
way of handling spatial reference parameters.  If a tag is not present, the
netCDFDataset::FetchCopyParms() function returns a default value.
Currently, those default values are all specified as 0.0.  Because of this,
there is no error and my projection is set with several 0.0 values.  I have
fixed the standard parallel issue on my local machine and it now supports
CF-1 tags(standard_parallel) as well as gdal tags (standard_parallel_1 and
standard_parallel_2).  I would like to continue to update the driver for
other tags that have been added to CF, but still support gdal tags as well,
but I am not sure if my programming methods will be suitable.  I would hate
to do a bunch of work and not be able to incorporate it.  Any thoughts on
how to go about this?

kss
# ===================
Kyle Shannon
Physical Science Technician
RMRS Fire Sciences Lab
Fire, Fuels & Smoke - RWU 4405
5775 Highway 10 W.
Missoula, MT 59808
(406) 829-6954
kshannon at fs.fed.us
# ===================


On Tue, Jan 12, 2010 at 1:57 PM, Frank Warmerdam <warmerdam at pobox.com>wrote:

> Kyle Shannon wrote:
>
>> After a little digging, it appears that the netCDF driver does not support
>> the tag:
>>
>> Lambert_Conformal:standard_parallel
>>
>> it supports:
>> Lambert_Conformal:standard_parallel_1
>> and:
>> Lambert_Conformal:standard_parallel_2
>>
>> I am not sure if the tag is out of specification, or if the driver needs
>> to be updated.  I also notice OGRSpatialReference has a separate function
>> for setting a Lambert Conformal Conic with single parallel:
>>
>> OGRErr SetLCC1SP( *double* dfCenterLat, *double* dfCenterLong, ...
>>
>> but this is not referenced in the netCDF driver.
>>
>> So, my next question is:
>> Can you specify the value of SP_1 and SP_2 as the same parallel in the
>> standard LCC, or do you have to set LCC1SP
>>
>> Thanks everyone for your patience,
>>
>
> Kyle,
>
> Good investigating.  I'd suggest filing a ticket, ideally referencing
> an example file.  It should be fairly easily added.
>
> Best regards,
> --
>
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam<http://pobox.com/%7Ewarmerdam>
> and watch the world go round - Rush    | Geospatial Programmer for Rent
>
>
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