一、问题的提出全国第二次土壤普查一般要求完成社、县、地区、省(市)级成果图,为此土壤普查前先要制备出各级工作底图,做为成果图的底图。如我市公社级1∶1万工作底图,有的是由1∶2.5万地形图经放大而来的。县级成果图由社级成果图经缩图拼图转绘而成。如我市县(区)级1∶5万成果图由公社级 First, the problem raised The second national soil census generally required completion of social, county, district, provincial (city) level results map, for this purpose before the census to prepare a map of work at all levels, as the bottom of the result map . Such as our commune 1: 10 million work base map, some by 1: 25000 topographic map by the enlarged. The county-level result map is drawn from the community-level result map by thumbnail jigsaw puzzle. Such as my city (district) 1: 50000 results map by the commune level