GDAL interprets ESRI rasters in NAD83 HARN as plain NAD83

[kreymborg]

ESRI rasters whose datum is NAD83 HARN (e.g. HPGN) are read as plain NAD83 by Gdal.

Using the following prj.adf file, which is State Plane Arizona Central, NAD 83 HARN:

Projection    STATEPLANE
Fipszone      202
Datum         HPGN
Spheroid      GRS80
Units         3.2808
Zunits        NO
Xshift        0.0
Yshift        0.0
Parameters   

When opening the file in using the Python GDAL bindings e.g.

gd = gdal.Open("c:/rastername/w001001.adf")
print gd.GetProjection()

Gdal reports the datum as "North_American_Datum_1983" and there is no mention of HARN.