First order triangle complement

Japanese: 一等三角補点 - いっとうさんかくほてん

…Baselines were established at 14 locations throughout the country. Triangulation surveys were carried out for each of the first-order triangulation supplement points, second-order, third-order, and fourth-order triangulation points based on the values of the first-order triangulation main point, and their longitudes and latitudes were determined. [Yoshimura Yoshimitsu]…

From [Triangulation point]

…In various countries around the world, triangulation points of various standards are installed according to the purpose, taking into account the country's conditions and topography. In Japan, there are five types of triangulation points: first-order main points (332 points), first-order supplementary points (637 points), second-order triangulation points (5,056 points), third-order triangulation points (32,770 points), and fourth-order triangulation points (48,376 points, all as of March 1982). They are installed and maintained by the Geospatial Information Authority of Japan, Ministry of Construction. …

*Some of the terminology explanations that mention "first-order triangulation complements" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…基線は全国14ヵ所に設置された。一等三角補点，二等，三等，四等の各三角点は，一等三角本点の値をもとにして三角測量が行われ，その経度，緯度が決められている。【吉村好光】。…

【三角点】より

…世界各国ではその国状や地形などを考慮してさまざまな規格の三角点を目的に応じて設置している。日本の場合は一等三角本点(332点)，一等三角補点(637点)，二等三角点(5056点)，三等三角点(3万2770点)，四等三角点(4万8376点。いずれも1982年3月現在)の5種類があり，建設省国土地理院により設置および維持管理が行われている。…

※「一等三角補点」について言及している用語解説の一部を掲載しています。

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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