词典论坛联络

   英语
Google | Forvo | +
名词 | 形容词
datum ['deɪtəm] 名词
一般 dateno; datumo; donaĵo; donitaĵo
 英语 词库
datum geodetic ['deɪtəm] 形容词
美国 A reference surface consisting of five quantities: the latitude and longitude of an initial point, the azimuth of a line from that point, and the parameters of the reference ellipsoid; The mathematical model of the earth used to calculate the coordinates on any map. Different nations use different datum for printing coordinates on their maps (JP 2-03)