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目前建材地质找矿阶段使用的较大比例尺地形草图,一般采用方格网法或缩放仪放大已有小比例尺地形图获得,但此方法工作量大、工期长、质量也不易控制。为此,1985年起试验以普通的普及型摄影器材对需放大的地形原图先微缩后放大的作业成图方法,并取得了较好的效果。该作业法设备简单、操作容易、具较高的经济效益。
At present, the larger scale topographic sketches used in the geological prospecting stage of building materials are generally obtained by using the grid method or the pantograph to enlarge the small scale topographic maps already obtained. However, the method requires a large workload, a long construction period and a poor quality control. To this end, since 1985 experiments with ordinary popular photographic equipment on the need to enlarge the topography of the first miniature zooming after the operation mapping method, and achieved good results. The operation method is simple, easy to operate, with high economic benefits.