일본 지도https://earth-planets-space.springeropen.com/articles/10.1186/s40623-018-0890-9/figures/2A new survey technology was needed for the objective reproduction of the Earth, which is the triangulation method. Triangulation is a method of finding out the coordinates and distance of a point to be measured using the properties of a triangle. Triangulation is a method that, given the point to be measured and the two reference points, measures the angle formed by the base side and two other sides in the triangle formed by the point and the two reference points, and measures the length of the side, then finds out the coordinates, distance, and height of the point to be measured through calculations using the sine law.Triangulation, 16th century. The distance and angle of two points can be identified as the location of a point.Cantino World Map, 1502김정호의 대동여지도(大東輿地圖) 는 평면 위의 직선거리가 아니라 산 넘고 물 건너 구불구불 실제로 가는 거리 정보를 기초로 지도를 제작했기 때문에 근대적인 삼각측량이나 경위도 측정에 기초하여 제작된 근대지도의 정확성에는 미치지 못한다.[네이버 지식백과] 대동여지도 [大東輿地圖] (한국민족문화대백과, 한국학중앙연구원)In the past, there was no way to accurately measure the shape of the ground other than triangulation. Prior to the release of satellite maps, maps made everywhere in the world depended on triangulation. However, triangulation was by no means an easy method. Measuring the ground required a lot of time, so cartographers like Mercator had to spend much of their lives surveying and calculating.In the 15th century, the West constructed measurement maps to depict the exact surface of the earth. But how did they measure the earth? Did they throw the earth over the grid to observe it, as seen in Dürer’s Perspective Exercise (1525)? Or did they measure the earth with a telescope that is powerful in the air by riding a hot air balloon? The 15th century was a time when we weren’t even sure if the earth was square or spherical…Triangulation can be used to calculate the height as well as the distance.A Palestinian map produced by triangulation. By using triangulation, you can accurately measure the shape of the land. All modern maps of the world were made by triangulation.
