Utilization of previous geological data and data collection in 1∶250000 regional geological amendment survey based on the digital mapping system

The key task for 1∶250000 amendment regional geological survey is to tap and utilize previous geological data and conduct secondary exploitation of previous data. During the experimental stage of digital geological mapping of the 1∶250000 Yulin City Sheet in Guangxi, the authors summarized a set of work methods for the utilization of previous geological data and data collection based on the digital mapping system. The workflow and work steps of this work method can be divided into six stages: (1) preparative stage, (2) indoor geological data input stage, (3) field digital geological survey stage, (4) indoor geological data compilation and analysis stage, (5) map compilation stage, and (6) result submission stage. As compared with traditional method of regional geological survey, this work method has improved greatly work efficiency and quality of regional geological survey and essentially meets the requirements of popularizing its application in the 1∶250000 amendment regional geological survey areas.