[PROJ] Matching EPSG:3005

[Nyall Dawson]

Hi list!

I suspect I'm overlooking something obvious, but I've read and re-read
this multiple times and can't spot it!

When attempting the identify the WKT string

PROJCS["NAD83 / BC Albers", GEOGCS [ "NAD83", DATUM ["North American
Datum 1983 (EPSG ID 6269)", SPHEROID ["GRS 1980 (EPSG ID 7019)",
6378137.0, 298.257222101]], PRIMEM [ "Greenwich", 0.000000 ], UNIT
["Decimal Degree", 0.0174532925199433]], PROJECTION ["Albers Conical
Equal Area"], PARAMETER ["Latitude_Of_Origin", 45.0], PARAMETER
["Central_Meridian", -126.0], PARAMETER ["Standard_Parallel_1", 50.0],
PARAMETER ["Standard_Parallel_2", 58.5], PARAMETER ["False_Easting",
1000000.0], PARAMETER ["False_Northing", 0.0], UNIT ["Meter", 1.0]]

I get a 25% match to EPSG:3005. Yet (obvious differences in the
various names aside) this DOES look equivalent to the definition
returned by projinfo EPSG:3005 -o WKT1_ESRI:

PROJCS["NAD_1983_BC_Environment_Albers",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",1000000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-126.0],PARAMETER["Standard_Parallel_1",50.0],PARAMETER["Standard_Parallel_2",58.5],PARAMETER["Latitude_Of_Origin",45.0],UNIT["Meter",1.0]]

Why do I only get a 25% confidence match here?

Nyall