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

[Markus Neteler]

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]]


> If however, lat_0 != lat_1, lat_2 *does* get included in the projection
> parameters (see attached lat_2_exists.png).
>
> Is this an error? Or is it incorrect usage on my part to have lat_0 and
> lat_1 equal?

Which GRASS GIS version do you use?

Markus