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近年来,由于城镇建设的飞速发展,对城镇地形图的形状提出了越来越高的要求,城镇地形图的修测工作也越来越受到测绘工作者的重视。目前,各城镇已经开展了地形图的修测工作,修测原则一般采取先重点后一般和往复循环方式,修测形式为分区集中修测,修测周期一般为4～8年,修测对象主要是一些新增建筑物和变化较大的地貌,修测方法采取常规和利用建筑物相关位置定位测图。这些修测方法在一段时间内可以收到一定效果,但也存在许多弊病,就是牵涉较多的力量,在历次修测中重复布点,做了许多重复劳动。坪且,由于多次修测,地形图的精度有所降低。因此,结合我国城镇测绘工作和特点,采取秘极的修测方法,使城
In recent years, due to the rapid development of urban construction, higher and higher requirements have been placed on the shape of urban topographic maps, and the work of repairing and surveying urban topographic maps has also received increasing attention from surveying and mapping workers. At present, the cities and towns have already carried out the work of repairing and surveying the topographic maps. The principle of repairing and testing generally adopts the first priority, the general and reciprocating circulation methods, and the repairing and measuring methods are divided into districts and concentrates. The repair cycle is generally 4 to 8 years. Mainly some new buildings and large changes in landforms, repair methods to take the routine and use of location-related mapping of buildings. These repair methods can receive certain results in a certain period of time, but there are also many drawbacks, that is, involving more forces, repeated distribution in the previous repairs, and doing a lot of duplication of work. Ping and, due to multiple repairs, the accuracy of the topographic map has been reduced. Therefore, in combination with the work of surveying and mapping in cities and towns in China and adopting secretive measures, the city