一、问题的提出当前,用于地质与水文地质编图方法有缩放仪法、复照法、静电复印法、光学投影仪法、描绘仪法等,它们的共同特点是设备先进,精度高,成图快,但构造复杂,价钱昂贵,因此使用未能普及。笔者根据自己近二十年的工作实践,尤其是一九八四年三至四月,在编制陕西关中1∶50万和陕西省1∶100万潜水矿化度图时, First, the issue raised At present, for geology and hydrogeology mapping methods are scaler method, complex method, electrophotographic method, optical projector method, rendering instrument method, their common feature is the advanced equipment, high precision, Rapid mapping, but the complex structure, expensive, so the use of not universal. According to my own work practice of nearly 20 years, especially from March to April 1984, when preparing the 1: 500,000 Guanzhong and 1: 1 million submarine salinity maps in Shaanxi Province,