Chatham County - County Boundaries

Feature class containing polygons representing the county boundaries of Chatham County and the surrounding counties. The boundaries are utilized within the Chatham County basemaps and provide important symbology at different scales of said basemaps. Sources for information are NC Division of Transportation, United States Geological Survey and actual field surveys conducted by North Carolina and South Carolina Licensed Surveyors that have been approved and recoded in their respective counties. This file shows some of the boundaries of counties which have a completed boundary survey but the majority of lines have not been surveyed. Also some boundaries cannot be surveyed in cases where boundaries are coincident with river centers. Most of the lines currently are from the DOT county maps which originally come from USGS but might have been updated by the county parcel maps. NAD83-86 Chatham GIS SOP: "MAPSERV-15"本要素类包含表示查塔姆县（Chatham County）及其周边各县边界的面要素。此类边界被应用于查塔姆县底图中，可为该类底图的不同比例尺提供重要的符号系统。本数据集的信息来源包括北卡罗来纳州交通部（NC Division of Transportation）、美国地质调查局（United States Geological Survey），以及由北卡罗来纳州与南卡罗来纳州持证测量员开展并经各自县审核备案的实地勘测数据。本文件展示了部分已完成边界勘测的县界，但绝大多数边界线尚未经过实地勘测。此外，若县界与河道中心线重合，则无法开展勘测工作。当前绝大多数边界线源自交通部县级地图，此类地图最初由美国地质调查局制作，后续可能通过县级宗地地图进行了更新。采用北美大地基准83-86（NAD83-86），并遵循查塔姆县地理信息系统标准作业流程："MAPSERV-15"