FEMA FIRM Panel 2008

The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the State Plane projection and coordinate system.The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.数字洪水保险费率地图（Digital Flood Insurance Rate Map, DFIRM）数据库描绘了用于生成洪水风险数据的洪水风险信息及配套支撑数据。其采用的主要风险分类包括年发生概率1%的洪水事件、年发生概率0.2%的洪水事件，以及最低洪水风险区域。DFIRM数据库的数据来源涵盖洪水保险研究（Flood Insurance Studies, FISs）、此前发布的洪水保险费率地图（Flood Insurance Rate Maps, FIRMs）、为支撑FISs与FIRMs所开展的洪水灾害分析，以及可用的新型测绘数据。其中FISs与FIRMs均由联邦紧急事务管理局（Federal Emergency Management Agency, FEMA）发布。该数据集文件通过州平面投影与坐标系实现了与地球表面的地理配准。DFIRM数据文件的平面控制规范与1:12000比例尺测绘所需的规范保持一致。