School Attendance Boundary Survey 2015-2016

This polygon files contains 2015-2016 school-year data delineating school attendance boundaries. These data were collected and processed as part of the School Attendance Boundary Survey (SABS) project which was funded by NCES to create geography delineating school attendance boundaries. Original source information that was used to create these boundary files were collected were collected over a web-based self-reporting system, through e-mail, and mailed paper maps. The web application provided instructions and assistance to users via a user guide, a frequently asked questions document, and instructional videos. Boundaries supplied outside of the online reporting system typically fell into one of six categories: a digital geographic file, such as a shapefile or KML file; digital image files, such as jpegs and pdfs; narrative descriptions; an interactive web map; Excel or pdf address lists; and paper maps. 2015 TIGER/line features (that consist of streets, hydrography, railways, etc.) were used to digitize school attendance boundaries and was the primary source of information used to digitize analog information. This practice works well as most school attendance boundaries align with streets, railways, water bodies and similar line features included in the 2015 TIGER/line "edges" files. In those few cases in which a portion of a school attendance boundary serves both sides of a street contractor staff used Esri’s Imagery base map to estimate the property lines of parcels. The data digitized from analog maps and verbal descriptions do not conform to cadastral data (and many of the original GIS files created by school districts do not conform with cadastral or parcel data). The SABS 2015-2016 file uses the WGS 1984 Web Mercator Auxiliary Sphere coordinate system. Additional information about SABS can be found on the EDGE website. The SABS dataset is intended for research purposes only and reflects a single snapshot in time. School boundaries frequently change from year to year. To verify legal descriptions of boundaries, users must contact the school district directly. All information contained in this file is in the public domain. Data users are advised to review NCES program documentation and feature class metadata to understand the limitations and appropriate use of these data.本多边形数据集包含2015-2016学年的学校入学边界划定数据。这些数据是作为学校入学边界调查（School Attendance Boundary Survey, SABS）项目的一部分收集并处理的，该项目由美国国家教育统计中心（National Center for Education Statistics, NCES）资助，旨在生成用于划定学校入学边界的地理信息数据。用于创建此类边界文件的原始源信息，通过基于网页的自我报告系统、电子邮件以及邮寄纸质地图的方式收集。该网页应用程序通过用户指南、常见问题文档和教学视频为使用者提供操作指引与协助。未通过在线报告系统提交的边界数据通常分为六大类：数字地理文件（如shapefile或KML文件）、数字图像文件（如JPEG和PDF文件）、文本描述、交互式网页地图、Excel或PDF格式的地址列表，以及纸质地图。2015年TIGER/线（TIGER/Line）要素（包含街道、水文、铁路等）被用于数字化学校入学边界，且是模拟信息数字化的主要信息来源。该方法效果良好，因为多数学校入学边界与2015年TIGER/线“边”文件中包含的街道、铁路、水体及类似线状要素相契合。在极少数情况下，当学校入学边界的某一部分同时对应街道两侧时，项目工作人员会使用Esri影像底图来估算地块的产权界线。从模拟地图和文字描述中数字化得到的数据，并不符合地籍数据，多数学区创建的原始GIS文件也不符合地籍或地块数据。SABS 2015-2016数据集采用WGS 1984 Web Mercator Auxiliary Sphere坐标系。有关SABS的更多信息可在EDGE网站查询。本SABS数据集仅用于研究目的，仅反映某一特定时间点的快照状态。学校边界每年都会发生变动，若需验证边界的合法描述，使用者需直接联系所属学区。本文件包含的所有信息均属于公共领域。建议数据使用者查阅NCES项目文档及要素类元数据，以了解此类数据的局限性与合理使用方式。