DMO Mining Permits Coal Underground (Historic)

A layer containing the legacy data of permit boundaries of historic underground coal mine permits in Pennsylvania. Data was converted over from the physical "Mylar Review" system for mine permit location information requests. The physical topographic maps and mylar overlays of that system have been scanned, georeferenced, and vectorized to create the permit boundary polygons with an index number attribute. The corresponding index card data has been entered in a spreadsheet. The polygon layers’ attribute tables were joined with the spreadsheet. There are no planned updates for this layer. More recent underground coal mine permit data can be found in the ‘Mining Permits - Bituminous – Underground / Active’ layer. This layer is for informational purposes only and is known not to be a complete listing of all historic permits.本图层包含宾夕法尼亚州历史地下煤矿开采许可边界的遗留数据。该数据源自用于煤矿许可位置信息查询的实体"Mylar Review"系统。此系统的实体地形图与聚酯薄膜覆盖图已完成扫描、地理配准与矢量化处理，从而生成带有索引编号属性字段的许可边界多边形要素。对应的索引卡片数据已录入电子表格，多边形图层的属性表已与该电子表格完成关联。本图层暂无更新计划。更近期的地下煤矿开采许可数据可于"Mining Permits - Bituminous – Underground / Active"图层中查询。本图层仅用于信息参考，且并非所有历史煤矿许可的完整清单。