VT Data - RPC (Regional Planning Commission) Boundaries

(Link to Metadata) The BNDHASH dataset depicts Vermont village, town, county, and Regional Planning Commission (RPC) 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) BNDHASH_POLY_VILLAGES = Vermont villages 2) BNDHASH_POLY_TOWNS = Vermont towns 3) BNDHASH_POLY_COUNTIES = Vermont counties 4) BNDHASH_POLY_RPCS = Vermont's Regional Planning Commissions 5) BNDHASH_POLY_VTBND = Vermont's state boundary 6) BNDHASH_LINE = Lines on which all POLY feature classes are built The master BNDHASH data is managed as an ESRI geodatabase feature dataset by VCGI. The dataset stores village, town, county, RPC, and state 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/state 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 locations 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 feature 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.

(元数据链接) 本BNDHASH数据集描绘了佛蒙特州的村、镇、县及区域规划委员会（Regional Planning Commission, RPC）边界。该数据集整合了来自多个数据源的通用"最佳可用"边界（详见ARC_SRC与SRC_NOTES属性）。但本数据集不旨在提供具有法律效力的官方边界。

该图层最初源自TBHASH——BNDHASH发布前的VGIS主城镇边界图层。佛蒙特州地理空间信息中心（VCGI）通过将村、镇、县、RPC及州界整合为单一图层，实现了各类边界的垂直集成，并简化了维护工作。BNDHASH还包含镇、县及RPC名称的注记文本。

BNDHASH包含以下要素类：
1) BNDHASH_POLY_VILLAGES = 佛蒙特州村落边界
2) BNDHASH_POLY_TOWNS = 佛蒙特州城镇边界
3) BNDHASH_POLY_COUNTIES = 佛蒙特州县界
4) BNDHASH_POLY_RPCS = 佛蒙特州区域规划委员会（RPC）辖区边界
5) BNDHASH_POLY_VTBND = 佛蒙特州州界
6) BNDHASH_LINE = 支撑所有多边形要素类的线要素

主BNDHASH数据由VCGI以ESRI地理数据库（geodatabase）要素数据集的形式进行管理。该数据集将村、镇、县、RPC及州界存储为独立的要素类，并通过一组拓扑规则绑定各要素，以此确保各类边界的垂直集成。

VCGI将每年通过审查佛蒙特州州档案馆——州务卿办公室存档的记录来更新本图层。VCGI同时欢迎VGIS用户提交的可佐证边界错误的书面信息。

注意：VCGI并未尝试创建具有法律效力的官方边界图层。本数据集旨在维护一套集成的村/镇/县/RPC/州界图层，以合理准确地呈现各类边界（详见ARC_SRC与SRC_NOTES）。

BNDHASH涵盖了州务卿办公室2000年发布的《人口与地方政府——佛蒙特州》中列出的全部县、镇及村落。BNDHASH可能包含2000年该文献发布后经州立法机构批准的边界变更（例如村落并入城镇的情况）。最终，佛蒙特州州务卿办公室及佛蒙特州议会负责维护可准确描述各类边界位置的信息。

BNDHASH仅可用于通用制图用途。* 若用户需确定与原始TBHASH边界存在差异的边界，可参考BOUNDARY_BNDHASH_LINE（带属性的线要素图层）中的ORIG_ARC字段。此外，BNDHASH的更新通过版本号进行追踪（例如：2003A）。UPDACT字段用于追踪不同版本间的变更，该字段会在版本更新时重置。