The traditional surveying and mapping technology has the problems of low accuracy and poor integration inspection in the early stage of the development of contaminated land replacement. The mapping technology of topographic map in the early stage of pollution land replacement is put forward based on the three encryption technology. According to the topographic survey results and land pollution situation, basic control survey data collected to measure data based design technology implementation process; using UAV aerial photography, obtaining terrain strip distribution, measurement range; the use of space three encryption mapping technology acquisition, digital map data to measure contour extraction and editing, three-dimensional terrain mapping and image editing, complete topographic map.%传统测绘技术进行污染土地置换开发前期地形图测绘存在精准度低,整合检查效果差的问题,提出基于空三加密技术的污染土地置换开发前期地形图测绘技术.根据地形勘测结果和土地污染现状,收集基本控制测量数据,以测量数据为基础设计技术实施流程;采用无人机进行航空摄影,获取地形航带分布情况,测量区域范围;利用空三加密测绘技术对数字测图数据进行采集、等高线提取与编辑、地形立体测绘和图像编辑,完成地形图的测绘.
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