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按县、市、省(区)或盆地、水系流域等地理单元建立地图的数学基础,在地质编图中是常见的,现归纳为两类。 一、独立性编图 1.编图范围不大,经差在3°以内:例如:编制甘肃省各县、市的挂图或编制酒泉盆地、龙首山地质图等,编图的范围都不很大,经差一般均在3°以内,纬差也在3°左右,此种编图的比例尺一般都较大,大于1:50万,以至大于1:20万,此图多以国
The mathematical basis for the establishment of maps by geographical units such as counties, cities, provinces (districts) or basins and drainage basins is common in geological mapping and is now classified into two categories. First, the independence of the Editor 1. Editor is not a small range, the difference in less than 3 °: for example: the preparation of counties and cities in Gansu hanging wall charts or the preparation of Jiuquan Basin, Longshoushan geological map, the scope of the series are not Very large, the difference are generally less than 3 °, weft difference is about 3 °, such a scale is generally larger than the scale, more than 1: 500000, and even more than 1: 200000, this map and more countries