BTV City Boundary

The BNDHASH dataset depicts Vermont villages, towns, counties, Regional Planning Commissions (RPC), and LEPC (Local Emergency Planning Committee) boundaries. It is a composite of generally 'best available' boundaries from various data sources (refer to ARC_SRC and SRC_NOTES attributes). However, this dataset DOES NOT attempt to provide a legally definitive boundary. The layer was originally developed from TBHASH, which was the master VGIS town boundary layer prior to the development and release of BNDHASH. By integrating village, town, county, RPC, and state boundaries into a single layer, VCGI has assured vertical integration of these boundaries and simplified maintenance. BNDHASH also includes annotation text for town, county, and RPC names. BNDHASH includes the following feature classes: 1) VILLAGES = Vermont villages 2) TOWNS = Vermont towns 3) COUNTIES = Vermont counties 4) RPCS = Vermont's Regional Planning Commissions 5) LEPC = Local Emergency Planning Committee boundaries 6) VTBND = Vermont's state boundary The master BNDHASH layer is managed as ESRI geodatabase feature dataset by VCGI. The dataset stores villages, towns, counties, and RPC boundaries as seperate feature classes with a set of topology rules which binds the features. This arrangement assures vertical integration of the various boundaries. VCGI will update this layer on an annual basis by reviewing records housed in the VT State Archives - Secretary of State's Office. VCGI also welcomes documented information from VGIS users which identify boundary errors. NOTE - VCGI has NOT attempted to create a legally definitive boundary layer. Instead the idea is to maintain an integrated village/town/county/rpc boundary layer which provides for a reasonably accurate representation of these boundaries (refer to ARC_SRC and SRC_NOTES). BNDHASH includes all counties, towns, and villages listed in "Population and Local Government - State of Vermont - 2000" published by the Secretary of State. BNDHASH may include changes endorsed by the Legislature since the publication of this document in 2000 (eg: villages merged with towns). Utlimately the Vermont Secratary of State's Office and the VT Legislature are responsible for maintaining information which accurately describes the location of these boundaries. BNDHASH should be used for general mapping purposes only. * Users who wish to determine which boundaries are different from the original TBHASH boundaries should refer to the ORIG_ARC field in the BOUNDARY_BNDHASH_LINE (line featue with attributes). Also, updates to BNDHASH are tracked by version number (ex: 2003A). The UPDACT field is used to track changes between versions. The UPDACT field is flushed between versions.BNDHASH数据集描绘了佛蒙特州（Vermont）的村庄、城镇、县、区域规划委员会（Regional Planning Commissions，RPC）以及地方应急规划委员会（Local Emergency Planning Committee，LEPC）的边界。该数据集整合了来自各类数据源的、总体上为“最佳可用”的边界数据（详见ARC_SRC与SRC_NOTES属性字段）。但本数据集并非旨在提供具有法律效力的官方边界。该图层最初基于TBHASH开发，而TBHASH是BNDHASH发布前的VGIS城镇边界主图层。通过将村庄、城镇、县、RPC以及州界整合为单一图层，VCGI实现了各类边界的垂直整合，并简化了数据维护工作。BNDHASH还包含城镇、县以及RPC名称的注记文本。BNDHASH包含以下要素类：1) VILLAGES = 佛蒙特州村庄 2) TOWNS = 佛蒙特州城镇 3) COUNTIES = 佛蒙特州县 4) RPCS = 佛蒙特州区域规划委员会 5) LEPC = 地方应急规划委员会边界 6) VTBND = 佛蒙特州州界。BNDHASH主图层由VCGI以ESRI地理数据库要素数据集的形式进行管理。该数据集将村庄、城镇、县与RPC边界存储为独立的要素类，并通过一组拓扑规则绑定各要素。该架构确保了各类边界的垂直整合。VCGI将通过审查佛蒙特州州档案馆——州务卿办公室存档的记录，每年更新该图层。VCGI同时欢迎VGIS用户提交带有佐证材料的边界错误反馈信息。注意：VCGI并未旨在打造具有法律效力的官方边界图层，其初衷是维护一套整合后的村庄/城镇/县/RPC边界图层，能够较为准确地呈现各类边界的位置（详见ARC_SRC与SRC_NOTES字段）。BNDHASH涵盖了州务卿办公室发布的"Population and Local Government - State of Vermont - 2000"中列出的全部县、城镇与村庄。自2000年该文件发布以来，BNDHASH可能已纳入州议会批准的边界变更（例如村庄与城镇合并的情况）。最终，佛蒙特州州务卿办公室与佛蒙特州议会负责维护能够准确描述上述边界位置的官方信息。BNDHASH仅可用于通用制图用途。* 用户若需查询与原始TBHASH边界存在差异的边界项，可查阅BOUNDARY_BNDHASH_LINE（带属性的线要素）中的ORIG_ARC字段。此外，BNDHASH的更新以版本号进行追踪（例如2003A）。UPDACT字段用于追踪各版本间的变更内容，且该字段会在版本更新时被清空重置。