To create a map covering a wide area, two procedures must first be carried out: (1) a certain point must be designated as the origin of longitude and latitude, and the longitude and latitude must be determined by astronomical observation or some other method, and (2) the size and shape of the reference Earth ellipsoid must be determined, and the geometric relationship with the origin of longitude and latitude must be clarified. Once this is completed, a large number of triangulation points can be placed around the origin, and the longitude, latitude, and elevation of these points can be determined one after another by triangulation, trilateration, etc. When the positions of a large number of triangulation points are determined in this way using a unified coordinate system, the entire system is called a geodetic network. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
広い範囲にわたる地図を作るためには,(1)ある点を経緯度原点とし,天文観測その他のなんらかの方法で経緯度を決める,(2)基準とする地球楕円体の大きさや形を決め,経緯度原点との幾何学的位置関係を明確にする,という二つの手続きがまず必要である。これが完了すれば,原点の周囲に多数の三角点を設置し,三角測量,三辺測量などによって,それらの点の経緯度,高さをつぎつぎに決めていくことができる。こうして,多数の三角点の位置を統一した座標系によって定めた場合,その全体のシステムを測地網という。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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