datum of chart 中文意思是什麼

datum of chart 解釋
海圖的基準面
  • datum : n. （pl. data ） 〈拉丁語〉1. 〈常 pl. 〉 數據，資料。2. 論據，作為論據的事實。3. 【數學】已知數。4. 【測】基點，基線，基面。
  • of : OF ＝Old French 古法語。
  • chart : n 1 海圖，航（線）圖，航海圖；地勢圖（＝physical chart），（軍用）地形圖（＝topographic chart）。...
  1. The digital map is usually formed by the water depth ' s database measured on the seabottom. because of the disadvantage that the database is kept secret, this dissertation introduces a new method : first, the depth data are picked up from the electronic chart, then interpolation of the depth datum by kriging algorithm is adopted to gain the digital map. the method is the precondition of the terrain matching when it is researched by simulation, and it is the complement of the database

    通常數字地圖都是通過海底測量的海底水深數據庫來形成，針對水深數據庫存在保密性等特點，本文提出了一種從電子海圖提取水深數據，然後採用kriging方法進行插值形成數字地圖的方法，該方法是進行地形匹配模擬研究的前提，而且它也是海底水深數據庫的一個補充。
  2. Water level in the tolo harbour was as high as 5. 4 metres above chart datum as compared with the normal high tide of 2. 2

    吐露港的潮水高度竟達海圖基準面以上5 . 4米，而正常的漲潮只有2 . 2米。
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