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前言 国家测绘总局、总参测绘局于1958年前后在云南省西部地区下关、巍山、祥云、弥渡、南涧一带,为了满足测图需要在原一等三角锁环内布设了二、三等三角网,并在1962年进行了整体平差;但由于当时布网图形强度不够好,在大仓片形成了一个空心区域。为了使边角网形完整,1971年我们进行了重新补点。1979年复测时全网共叁拾壹个三角点,柒拾陆条边,实际重合旧点26个,该网最长边24.4~(km),最短边3.8~(km),平均边长12.3~(km);最高点3118~m,最低点1716~m,平均高程2000~m以上,点间最大高差1146~m,
Foreword The State Administration of Surveying and Mapping, General Staff Survey and Mapping Bureau around 1958 in the western region of Yunnan Province, Shimonoseki, Weishan, Xiangyun, Midu, Nanjian area, in order to meet the mapping needs in the first-class triangular lock ring layout second, third Triangulation, and the overall adjustment was made in 1962; however, because of the poor pattern strength at the time, a hollow area was formed in the large sheet. In 1971, we made a fresh point in order to complete the reticulation of the corner. In 1979, when the total number of reams in the whole network was three, a triangle was formed, and the edge of the land was picked up. In fact, the old point was overlapped with 26, with the longest edge of 24.4 ~ (km) and the shortest edge of 3.8 ~ (km) 12.3 ~ (km); the highest point of 3118 ~ m, the lowest point of 1716 ~ m, the average elevation of 2000 ~ m or more, the maximum difference between points 1146 ~ m,