1.地形图与地质调查进行地质调查时,必须将调查结果:明确的表示在地形图上,因此地形图乃成为地质调查上不可缺少的东西,如果地形图愈正确,则地质调查也愈易进行。如果事先有既成的地形图存在时,则极感方便,但如无有时,则必须事先将地形图作好,然后再开始调查工作。在中国各地进行调查时,事先能有地形图存在的情形极为稀有。因 1. Topographic Map and Geological Survey When conducting a geological survey, the survey results must be clearly expressed on the topographic map. Topographic maps therefore become indispensable for geological surveys. The more accurate the topographical maps, the more likely the geological survey will be. get on. If there is an existing topographic map in existence, it is very convenient, but if not, you must make the topographic map before you start the investigation. When conducting surveys in various parts of China, it is extremely rare that there is a topographical map in advance. because