National Flood Hazard Layer - Carbon County 2002

The National Flood Hazard Layer (NFHL) data incorporates all Flood Insurance Rate Map (FIRM) databases published by the Federal Emergency Management Agency (FEMA), and any Letters Of Map Revision (LOMRs) that have been issued against those databases since their publication date. It is updated on a monthly basis. The FIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper FIRMs. The FIRM 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 FIRM Database is derived from Flood Insurance Studies (FISs), previously published 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 FEMA. The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all FIRM Databases and corresponding LOMRs available on the publication date of the data set. The specification for the horizontal control of FIRM Databases is consistent with those required for mapping at a scale of 1:12,000. This file is georeferenced to the Earth's surface using the Geographic Coordinate System (GCS) and North American Dataum of 1983 (NSRS-2007).

This data is hosted at, and may be downloaded or accessed from PASDA, the Pennsylvania Spatial Data Access Geospatial Data Clearinghouse http://www.pasda.psu.edu/uci/DataSummary.aspx?dataset=2284

国家洪水灾害层（NFHL）数据集整合了联邦紧急事务管理署（FEMA）发布的所有洪水保险费率图（FIRM）数据库，以及自其发布之日起针对这些数据库所发布的任何地图修订函（LOMRs）。该数据集每月更新一次。FIRM数据库是洪水灾害信息在已发布的纸质FIRM上的数字地理空间版本。FIRM数据库描绘了用于开发风险数据的洪水风险信息和支撑数据。主要的风险分类包括1%年一遇的洪水事件、0.2%年一遇的洪水事件以及低洪水风险区域。FIRM数据库源自洪水保险研究（FISs）、先前发布的FIRM、为FISs和FIRM提供支持的洪水灾害分析以及可用的新测绘数据。FISs和FIRM由FEMA发布。NFHL数据集以州或美国领地数据集的形式提供。每个州或领地数据集包含在数据集发布日期上可用的所有FIRM数据库和相应的LOMRs。FIRM数据库的水平控制规范与1:12,000比例测绘所要求的规范一致。该文件使用地理坐标系统（GCS）和1983年北美数据基准（NSRS-2007）对地球表面进行地理参照。该数据托管于宾夕法尼亚空间数据访问（PASDA）地理空间数据仓库，可通过http://www.pasda.psu.edu/uci/DataSummary.aspx?dataset=2284下载或访问。