What is a Natural Area Code (NAC)?
A Natural Area Code is a set of very short geodetic coordinates to represent an area anywhere on the earth or a three-dimensional region in the universe. A typical NAC contains three character strings, the first one for the longitude, the second one for the latitude, and the third one for the altitude of a region. Each character of a NAC is selected from the character set: digits 0 – 9 and all consonant English capital letters, to represent an integer ranging from 0 to 29. For example, a two-dimensional eight-character NAC represents an area on the earth with 1.6 seconds longitude span and 0.8 latitude span, i.e. about 50 meters from the east to the west and 25 meters from the south to the north, which can be used as an ideal global postal code. A ten-character NAC can represent an area on the earth with 1.6 meters in easting and 0.8 meter in northing, which can be used as an ideal universal property identity code for property registration and emergency address-dispatching. Click to go
