HI: Height of Instrument

This record specifies the height of instrument (HI) for a station. HIs and HTs (HT record) are used by GeoLab for reducing observations to the station markers. Once an HI is set for a station, it remains in effect until another HI for that station is encountered. If you wish to reset the HI for a station to zero (i.e. no reduction), you must use the HI record with a value of 0.0 for the HI. Initially (before any HI or HT records are encountered), all HIs and HTs are initialized to zero.

This record has two possible formats, a long parameter name format, and a short parameter name format. If column 10 contains an asterisk (*) the long name format is expected, otherwise the short name format is expected.

The short parameter name format is as follows:

Columns 002-005: HI
Columns 010-010: (blank)
Columns 011-022: Station name
Columns 024-033: Height of instrument
Columns 035-036: Linear unit name

The long parameter name format is as follows:

Columns 002-005: HI
Columns 010-010: * (asterisk)
Columns 011-041: Station name
Columns 043-052: Height of instrument
Columns 054-055: Linear unit name