2013 FEMA Transportation

The National Flood Hazard Layer (NFHL) data incorporates all Digital Flood Insurance Rate Map(DFIRM) databases published by FEMA, and any Letters Of Map Revision...国家洪水灾害图层（National Flood Hazard Layer，NFHL）数据集整合了美国联邦紧急事务管理局（Federal Emergency Management Agency，FEMA）发布的全部数字洪水保险费率地图（Digital Flood Insurance Rate Map，DFIRM）数据库，以及各类地图修订函（Letters Of Map Revision）相关内容。