自从1954年在黄河上開始一等三角观測以來,每逢陰天就停止观測。算算看吧,三年來有多少宝貴的時間,因为我們沒有利用,而从我們身边溜走了! 在一等观測中,所观測的不是花杆也不是觇标,而是远在几十公里以外的光源——反射的日光或电光。在陰天因为日光無法利用,只能利用电的光源來返光。在苏联这是不成問題的。測量规范中指出:陰天照准用电光的迴光灯。西歐國家也都是这样,应用 Since the first triangulation began on the Yellow River in 1954, observations have ceased on cloudy days. Let’s take a look and see how precious time has been in three years because we haven’t used it and we have slipped away from us! In the first-class observations, what was observed was not a pole or a pole, but it was far away. Light sources dozens of kilometers away - reflected sunlight or electro-optic light. In the cloudy days, sunlight cannot be used, and only electric light sources can be used to return light. This is not a problem in the Soviet Union. The measurement specification states: Backlights that use electro-optic light on cloudy days. Western European countries are also like this, applying