RFC 1876 (rfc1876) - Page 2 of 18
A Means for Expressing Location Information in the Domain Name System
Alternative Format: Original Text Document
RFC 1876 Location Information in the DNS January 1996 2. RDATA Format MSB LSB +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 0| VERSION | SIZE | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 2| HORIZ PRE | VERT PRE | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 4| LATITUDE | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 6| LATITUDE | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 8| LONGITUDE | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 10| LONGITUDE | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 12| ALTITUDE | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 14| ALTITUDE | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ (octet) where: VERSION Version number of the representation. This must be zero. Implementations are required to check this field and make no assumptions about the format of unrecognized versions. SIZE The diameter of a sphere enclosing the described entity, in centimeters, expressed as a pair of four-bit unsigned integers, each ranging from zero to nine, with the most significant four bits representing the base and the second number representing the power of ten by which to multiply the base. This allows sizes from 0e0 (<1cm) to 9e9 (90,000km) to be expressed. This representation was chosen such that the hexadecimal representation can be read by eye; 0x15 = 1e5. Four-bit values greater than 9 are undefined, as are values with a base of zero and a non-zero exponent. Since 20000000m (represented by the value 0x29) is greater than the equatorial diameter of the WGS 84 ellipsoid (12756274m), it is therefore suitable for use as a "worldwide" size. HORIZ PRE The horizontal precision of the data, in centimeters, expressed using the same representation as SIZE. This is the diameter of the horizontal "circle of error", rather Davis, et al Experimental
