GRSM_CONGRESSIONAL_DISTRICTS

The TIGER/Line shapefiles and related database files (.dbf) (NTAD 2014) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. Congressional Districts are the 435 areas from which people are elected to the U.S. House of Representatives. After the apportionment of congressional seats among the States based on census population counts, each State is responsible for establishing congressional districts for the purpose of electing representatives. Each congressional district is to be as equal in population to all other congressional districts in a State as practicable. The congressional districts for the 113th Congress (January 2013 to 2015) are the first Congressional Districts based on 2010 Census data. The TIGER/Line shapefiles for the District of Columbia, Puerto Rico, and the Island Areas (American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, and the U.S. Virgin Islands) each contain a single record for the non-voting delegate district in these areas. The boundaries of all other congressional districts are provided to the Census Bureau through the Redistricting Data Program (RDP). These data are a subset of a larger dataset published by the organization listed in the credits. Great Smoky Mountains National Park makes these data available in this form such that users can: effectively manipulate data for park mapping activities that do not require the acquisition of a large, nation-wide data set; alter symbology and rendering parameters natively; restrict analysis of geospatial data to an extent that coincides with the park footprint. The corresponding Integration of Resource Management Applications (IRMA) NPS Data Store reference is Great Smoky Mountains National Park Congressional Districts.

TIGER/Line形状文件（TIGER/Line shapefiles）及相关数据库文件（.dbf，NTAD 2014），是从美国人口普查局的主地址文件/拓扑集成地理编码与参考数据库（Master Address File / Topologically Integrated Geographic Encoding and Referencing，简称MAF/TIGER数据库，缩写为MTDB）中提取的精选地理与制图信息子集。MAF/TIGER数据库为无缝全国数据集，各组成部分间无重叠与间隙，但每份TIGER/Line形状文件既可作为独立数据集单独使用，也可组合使用以覆盖全美范围。
国会选区是选举美国众议院议员的435个行政区域。根据人口普查的人口统计结果完成国会席位在各州的分配后，各州需负责划定本州的国会选区以选举议员。在实际可行范围内，各州内各国会选区的人口规模应尽可能保持均等。第113届美国国会（2013年1月至2015年）的国会选区是首批基于2010年美国人口普查数据划定的国会选区。
针对哥伦比亚特区、波多黎各及各岛屿地区（美属萨摩亚、关岛、北马里亚纳群岛联邦、美属维尔京群岛）的TIGER/Line形状文件，均包含对应地区无投票权代表选区的单条记录。其余所有国会选区的边界数据，均通过重划选区数据计划（Redistricting Data Program，简称RDP）提交至美国人口普查局。
本数据集为致谢栏中所列机构发布的更大规模数据集的子集。大烟山国家公园（Great Smoky Mountains National Park）以该形式发布此类数据，可使使用者实现以下目标：高效处理无需获取大型全国数据集的公园制图相关数据；原生修改符号体系与渲染参数；将地理空间数据分析范围限定为与公园边界一致的区域。对应的资源管理应用集成（Integration of Resource Management Applications，简称IRMA）国家公园服务数据存储引用为：大烟山国家公园国会选区。