National Fish Habitat Action Plan (NFHAP) 2010 HCI Scores and Human Disturbance Data (linked to NHDPLUSV1) for Virginia

This shapefile contains landscape factors representing human disturbances summarized to local and network catchments of river reaches for the state of Virginia. This dataset is the result of clipping the feature class 'NFHAP 2010 HCI Scores and Human Disturbance Data for the Conterminous United States linked to NHDPLUSV1.gdb' to the state boundary of Virginia. Landscape factors include land uses, population density, roads, dams, mines, and point-source pollution sites. The source datasets that were compiled and attributed to catchments were identified as being: (1) meaningful for assessing fish habitat; (2) consistent across the entire study area in the way that they were assembled; (3) representative of conditions in the past 10 years, and (4) of sufficient spatial resolution that they could be used to make valid comparisons among local catchment units. In this data set, these variables are linked to the catchments of the National Hydrography Dataset Plus Version 1 (NHDPlusV1) using the COMID identifier. They can also be linked to the reaches of the NHDPlusV1 using the COMID identifier. Catchment attributes are available for both local catchments (defined as the land area draining directly to a reach; attributes begin with "L_" prefix) and network catchments (defined by all upstream contributing catchments to the reach's outlet, including the reach's own local catchment; attributes begin with "N_" prefix). This shapefile also includes habitat condition scores created based on responsiveness of biological metrics to anthropogenic landscape disturbances throughout ecoregions. Separate scores were created by considering disturbances within local catchments, network catchments, and a cumulative score that accounted for the most limiting disturbance operating on a given biological metric in either local or network catchments. This assessment only scored reaches representing streams and rivers (see the process section for more details). Please use the following citation: Esselman, P., D.M. Infante, L. Wang, W. Taylor, W. Daniel, R. Tingley, J. Fenner, A. Cooper, D. Wieferich, D. Thornbrugh and J. Ross. (April 2011) National Fish Habitat Action Plan (NFHAP) 2010 HCI Scores and Human Disturbance Data (linked to NHDPLUSV1) for Virginia. National Fish Habitat Partnership Data System. http://dx.doi.org/doi:10.5066/F7CJ8BG0

本形状文件（shapefile）包含表征人为干扰的景观因子，这些因子已汇总至弗吉尼亚州河段的局地集水区与网络集水区。
本数据集是将要素类（feature class）“关联至NHDPLUSV1.gdb的美国本土2010年国家鱼类栖息地行动计划（National Fish Habitat Action Plan，NFHAP）人类干扰数据与栖息地条件指数（Habitat Condition Index，HCI）得分”裁剪至弗吉尼亚州州界后得到的成果。
景观因子涵盖土地利用类型、人口密度、道路、水坝、矿山以及点源污染场地。
经汇编并赋值至集水区的源数据集满足以下遴选标准：(1) 可有效用于评估鱼类栖息地；(2) 在整个研究区内的汇编方式保持一致；(3) 能够反映过去10年的环境状况；(4) 具备足够的空间分辨率，可对局地集水区单元开展可靠的对比分析。
本数据集中，这些变量通过COMID标识符（COMID）与全国水文数据集增强版第1版（National Hydrography Dataset Plus Version 1，NHDPlusV1）的集水区进行关联。
同时，也可通过COMID标识符（COMID）将这些变量与NHDPlusV1的河段进行关联。
集水区属性分为两类：局地集水区（指直接向河段汇水的陆地区域，属性以“L_”为前缀）与网络集水区（指覆盖河段出水口上游所有汇水集水区，包含河段自身的局地集水区，属性以“N_”为前缀）。
本形状文件还包含基于生物指标（biological metrics）对全生态区人为景观干扰的响应性所计算得到的栖息地条件得分。
研究分别基于局地集水区、网络集水区内的干扰情况生成了专属得分，同时还生成了累积得分，该累积得分综合了对局地或网络集水区内特定生物指标起主导限制作用的干扰因子。
本次评估仅对代表溪流与河流的河段进行得分计算（详细流程参见流程部分）。
请引用以下文献：Esselman, P.、D.M. Infante、L. Wang、W. Taylor、W. Daniel、R. Tingley、J. Fenner、A. Cooper、D. Wieferich、D. Thornbrugh 及 J. Ross。(2011年4月) 《弗吉尼亚州关联至NHDPLUSV1的2010年国家鱼类栖息地行动计划（NFHAP）人类干扰数据与栖息地条件指数（HCI）得分》。国家鱼类栖息地伙伴关系数据系统。http://dx.doi.org/doi:10.5066/F7CJ8BG0