GIS Shapefile - Transportation, TIGER Road Network

TIGER road data for the MSA. When compared to high-resolution imagery and other transportation datasets positional inaccuracies were observed. As a result caution should be taken when using this dataset. TIGER, TIGER/Line, and Census TIGER are registered trademarks of the U.S. Census Bureau. ZCTA is a trademark of the U.S. Census Bureau. The Census 2000 TIGER/Line files are an extract of selected geographic and cartographic information from the Census TIGER data base. The geographic coverage for a single TIGER/Line file is a county or statistical equivalent entity, with the coverage area based on January 1, 2000 legal boundaries. A complete set of census 2000 TIGER/Line files includes all counties and statistically equivalent entities in the United States, Puerto Rico, and the Island Areas. The Census TIGER data base represents a seamless national file with no overlaps or gaps between parts. However, each county-based TIGER/Line file is designed to stand alone as an independent data set or the files can be combined to cover the whole Nation. The Census 2000 TIGER/Line files consist of line segments representing physical features and governmental and statistical boundaries. The boundary information in the TIGER/Line files are for statistical data collection and tabulation purposes only; their depiction and designation for statistical purposes does not constitute a determination of jurisdictional authority or rights of ownership or entitlement. The Census 2000 TIGER/Line files do NOT contain the Census 2000 urban areas which have not yet been delineated. The files contain information distributed over a series of record types for the spatial objects of a county. There are 17 record types, including the basic data record, the shape coordinate points, and geographic codes that can be used with appropriate software to prepare maps. Other geographic information contained in the files includes attributes such as feature identifiers/census feature class codes (CFCC) used to differentiate feature types, address ranges and ZIP Codes, codes for legal and statistical entities, latitude/longitude coordinates of linear and point features, landmark point features, area landmarks, key geographic features, and area boundaries. The Census 2000 TIGER/Line data dictionary contains a complete list of all the fields in the 17 record types. This is part of a collection of 221 Baltimore Ecosystem Study metadata records that point to a geodatabase. The geodatabase is available online and is considerably large. Upon request, and under certain arrangements, it can be shipped on media, such as a usb hard drive. The geodatabase is roughly 51.4 Gb in size, consisting of 4,914 files in 160 folders. Although this metadata record and the others like it are not rich with attributes, it is nonetheless made available because the data that it represents could be indeed useful.适用于都会统计区（MSA）的TIGER道路数据集。经与高分辨率影像及其他交通数据集比对后，发现该数据集存在位置精度偏差问题，因此在使用本数据集时需谨慎。TIGER、TIGER/Line以及普查TIGER均为美国人口普查局的注册商标，邮政编码制表区域（ZCTA）亦为美国人口普查局的注册商标。2000年人口普查TIGER/Line文件是从普查TIGER数据库中提取的选定地理与制图信息子集。单个TIGER/Line文件的地理覆盖范围为一个县或统计等效实体，覆盖范围基于2000年1月1日的法定边界。一套完整的2000年人口普查TIGER/Line文件涵盖美国、波多黎各及各岛屿地区的所有县与统计等效实体。普查TIGER数据库为无缝衔接的全国性文件，各部分之间无重叠或间隙。不过，每个基于县的TIGER/Line文件既可作为独立数据集单独使用，也可合并以覆盖整个国家范围。2000年人口普查TIGER/Line文件由代表自然地理特征、行政与统计边界的线段构成。TIGER/Line文件中的边界信息仅用于统计数据收集与制表用途，其用于统计目的的表述与指定并不构成对司法管辖权、所有权或权利归属的判定。2000年人口普查TIGER/Line文件不包含尚未完成划定的2000年普查城市区域。该文件包含针对县级空间对象的、按多种记录类型分布的信息，共涵盖17种记录类型，包括基础数据记录、形状坐标点，以及可配合相应软件用于制图的地理编码。文件中包含的其他地理信息包括：用于区分要素类型的要素标识符/普查要素类别代码（CFCC）、地址范围与邮政编码（ZIP Code）、法定与统计实体代码、线状及点状要素的经纬度坐标、地标点要素、区域地标、关键地理要素及区域边界。2000年人口普查TIGER/Line数据字典完整列出了17种记录类型中的所有字段。本元数据记录属于221份巴尔的摩生态系统研究元数据记录集合的一部分，指向一个地理数据库。该地理数据库可在线获取，体量较大。根据特定安排并提出申请后，可通过USB硬盘等介质寄送。该地理数据库大小约为51.4吉字节（Gb），包含160个文件夹下的4914个文件。尽管本元数据记录及其他同类记录的属性信息并不丰富，但鉴于其所代表的数据具备较高实用价值，仍予以公开。