ZANG: Zenithal Angle Observation
This record specifies a zenithal angle observation. A zenithal angle is measured at the from-station from the zenith down to the to-station.
The coefficient of refraction must be from 0.03 to 0.23 (0.13 ± 0.10). If a value less than 0.03 is given, no refraction correction is made. If a value greater than 0.23 is given, it is set to 0.23.
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 format of this record is as follows (from column - to column: description):
The long parameter format of this record is as follows (from column - to column: description):
The coefficient of refraction must be from 0.03 to 0.23 (0.13 ± 0.10). If a value less than 0.03 is given, no refraction correction is made. If a value greater than 0.23 is given, it is set to 0.23.
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 format of this record is as follows (from column - to column: description):
- 002-005: ZANG
- 007-009: Sigma record identifier (see the SIGM record)
- 010: (blank)
- 011-022: From-station name
- 024-035: To-station name
- 050: Sign (-/+/ ) of zenithal angle observation
- 051-053: Degrees of zenithal angle observation
- 055-056: Minutes of zenithal angle observation
- 058-064: Seconds of zenithal angle observation
- 066-075: Standard deviation of zenithal angle observation
- 077-086: Coefficient of refraction
The long parameter format of this record is as follows (from column - to column: description):
- 002-005: ZANG
- 007-009: Sigma record identifier (see the SIGM record)
- 010: * (asterisk)
- 011-041: From-station name
- 043-073: To-station name
- 075: Sign (-/+/ ) of zenithal angle observation
- 076-078: Degrees of zenithal angle observation
- 080-081: Minutes of zenithal angle observation
- 083-089: Seconds of zenithal angle observation
- 091-100: Standard deviation of zenithal angle observation
- 102-111: Coefficient of refraction