2010 Census Blocks for King County - Conflated to Parcels

The TIGER/Line Files are shapefiles and related database files (.dbf) that 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 File is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. Census Blocks are statistical areas bounded on all sides by visible features, such as streets, roads, streams, and railroad tracks, and/or by nonvisible boundaries such as city, town, township, and county limits, and short line-of-sight extensions of streets and roads. Census blocks are relatively small in area; for example, a block in a city bounded by streets. However, census blocks in remote areas are often large and irregular and may even be many square miles in area. A common misunderstanding is that data users think census blocks are used geographically to build all other census geographic areas, rather all other census geographic areas are updated and then used as the primary constraints, along with roads and water features, to delineate the tabulation blocks. As a result, all 2010 Census blocks nest within every other 2010 Census geographic area, so that Census Bureau statistical data can be tabulated at the block level and aggregated up to the appropriate geographic areas. Census blocks cover all territory in the United States, Puerto Rico, and the Island Areas (American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, and the U.S. Virgin Islands). Blocks are the smallest geographic areas for which the Census Bureau publishes data from the decennial census. A block may consist of one or more faces.

TIGER/Line文件（TIGER/Line Files）是从美国人口普查局（U.S. Census Bureau）的主地址文件/拓扑集成地理编码与参照数据库（Master Address File / Topologically Integrated Geographic Encoding and Referencing，简称MAF/TIGER数据库，MTDB）中提取的精选地理与制图信息的形状文件（shapefiles）及配套数据库文件（.dbf）。MAF/TIGER数据库（MTDB）是无缝衔接的全国性数据集，各部分之间无重叠与空白；但每个TIGER/Line文件均可作为独立数据集单独使用，也可组合使用以覆盖全美全域。普查区块（Census Blocks）是统计区域，四周以可见地物（如街道、道路、溪流、铁轨等）和/或不可见边界（如城市、城镇、镇区、县界，以及街道与道路的短视距延伸段）为界。普查区块的面积通常较小，例如城市中以街道为界的街区；但偏远地区的普查区块往往面积更大且形状不规则，面积可达数平方英里。存在一个常见误区：数据使用者认为普查区块是地理上构建其他所有普查地理区域的基础；实则恰恰相反，所有其他普查地理区域均会先完成更新，随后与道路、水系地物一同作为核心约束条件，用于划定统计用区块。因此，所有2010年普查区块均嵌套于其余所有2010年普查地理区域之内，如此一来，美国人口普查局的统计数据可按区块层级进行制表，并可向上汇总至对应地理区域。普查区块覆盖美国本土、波多黎各以及各岛区（美属萨摩亚、关岛、北马里亚纳群岛联邦以及美属维尔京群岛）的全部领土。区块是美国人口普查局发布十年人口普查（decennial census）数据的最小地理单元，一个区块可由一个或多个面要素构成。