[Proj] Parsing Lambert Conformal Conic in GDAL

[Kyle Shannon]

Hi,

I've come across a proj.4 projection (lcc) that may not be parsed
correctly by GDAL/OGR.  If I roundtrip EPSG:3979 through gdalsrsinfo,
I lose a standard parallel (forgive the clutter):

kyle at kyle-hp-laptop:gdal$ gdalsrsinfo -o proj4 EPSG:3979
'+proj=lcc +lat_1=49 +lat_2=77 +lat_0=49 +lon_0=-95 +x_0=0 +y_0=0
+ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs '

kyle at kyle-hp-laptop:gdal$ gdalsrsinfo -o wkt '+proj=lcc +lat_1=49
+lat_2=77 +lat_0=49 +lon_0=-95 +x_0=0 +y_0=0 +ellps=GRS80
+towgs84=0,0,0,0,0,0,0 +units=m +no_defs '
PROJCS["unnamed",GEOGCS["GRS 1980(IUGG,
1980)",DATUM["unknown",SPHEROID["GRS80",6378137,298.257222101],TOWGS84[0,0,0,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",49],PARAMETER["central_meridian",-95],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["Meter",1]]

So, is:

+proj=lcc +lat_1=49 +lat_2=77 +lat_0=49 +lon_0=-95 +x_0=0 +y_0=0
+ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs

a completely valid proj.4 string?  Is it okay to set a lat_1=lat_0,
and also specify lat_2.  I suspect it is, but I haven't found any
concrete definition on limits (and I don't really think there are,
within reason).

Thought I'd consult the pros on the list to be sure.

There is a ticket on gdal trac at: http://trac.osgeo.org/gdal/ticket/5191

Thanks.

-- 
Kyle