SciTools/iris — pull request #452 by munslowa (2013-04-12 16:22:46+00:00)
Title: g1_level1 handle surface level type

grib 1 file has low cloud cover grib message.
indicatorOfParameter = 186;
indicatorOfParameter = 186;
# Surface (of the Earth, which includes sea surface) (grib1/3.table)
indicatorOfTypeOfLevel = 1;
level = 0;

This pull request is to update the rules to handle this type of level.