1712 DNS Encoding of Geographical Location November 1994 3. Positive numbers indicate locations north of the equator. The real number describing the latitude encoded as a printable string. Positive numbers indicate locations east of the prime meridian. The precision is limited by 256 charcters.
Positive numbers indicate locations above mean sea-level.
Although this might not be considered optimal, it allows for a very high degree of precision with an acceptable average encoded record length. The geographical location is defined with the mnemonic GPOS and type code 27. This also guarantees a concise unambiguous description of a location by enforcing three compulsory numerical values to be specified. The owner, ttl, and class fields are optional and default to the last defined value if omitted. The longitude is a floating point number ranging from -90 to 90 with positive values indicating locations north of the equator.