Certain mercator projections not loading properly #3107
Description
RCM data generated by the RegCM4 model for CORDEX does not load correctly with Iris 2.0:
>>> cubeslist=iris.load('tasmax_CAM-44_MOHC-HadGEM2-ES_historical_r1i1p1_ICTP-RegCM4-3_v4_mon_19700101-19701230.nc')
UserWarning: False eastings other than 0.0 not yet supported for Mercator projections
warnings.warn('False eastings other than 0.0 not yet supported '
/opt/scitools/environments/default/2018_05_22-1/lib/python2.7/site-packages/iris/fileformats/_pyke_rules/compiled_krb/fc_rules_cf_fc.py:2171: UserWarning: False northings other than 0.0 not yet supported for Mercator projections
warnings.warn('False northings other than 0.0 not yet supported '
/opt/scitools/environments/default/2018_05_22-1/lib/python2.7/site-packages/iris/fileformats/_pyke_rules/compiled_krb/fc_rules_cf_fc.py:2181: UserWarning: Standard parallels other than 0.0 not yet supported for Mercator projections
warnings.warn('Standard parallels other than 0.0 not yet '
This gives the following cordinates (x and y dim coords missing)
air_temperature / (K) (time: 12; -- : 157; -- : 285)
Dimension coordinates:
time x - -
Auxiliary coordinates:
latitude - x x
longitude - x x