[GRASS-user] problem creating secant Lambert Conformal Conic projection

[Moritz Lennert]

On 14/05/16 16:14, Markus Neteler wrote:
> Hi Eric,
>
> On Fri, May 13, 2016 at 6:16 PM, Eric Patton <thepattonian at gmail.com> wrote:
>> Hi guys,
>>
>> I am trying to make a new Grass location with the secant Lambert Conformal
>> Conic projection.
>
> To be sure, that's this one, right?
> http://www.remotesensing.org/geotiff/proj_list/lambert_conic_conformal_2sp.html
>
>> I have noticed that if I am selecting the projection parameters through the
>> Grass GUI dialog, and lat_0 = lat_1, the value of lat_2 doesn't seem to be
>> included in the projection definition (see attached screenshot
>> lat_2_is_gone.png).
>
> Strange. I have replicated it here and it looks fine:
>
> GRASS 7.0.3 (lcc):~ > g.proj -w
> PROJCS["Lambert Conformal Conic",
>      GEOGCS["wgs84",
>          DATUM["WGS_1984",
>              SPHEROID["WGS_1984",6378137,298.257223563],
>              TOWGS84[0.000,0.000,0.000]],
>          PRIMEM["Greenwich",0],
>          UNIT["degree",0.0174532925199433]],
>      PROJECTION["Lambert_Conformal_Conic_2SP"],
>      PARAMETER["standard_parallel_1",65],
>      PARAMETER["standard_parallel_2",75],
>      PARAMETER["latitude_of_origin",60],
>      PARAMETER["central_meridian",60],
>      PARAMETER["false_easting",0],
>      PARAMETER["false_northing",0],
>      UNIT["Meter",1]]
>


In your case let_0 != lat_1, so this corresponds to the case where it 
works also for Eric. It's the case when lat_0 = lat_1 that doesn't work 
for him.

Testing here with grass64, grass70, grass71 it works, though (see 
attached screenshot). No idea what is going wrong for you, there, Eric.

Moritz
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