Hydrology Lines

The dataset represents the linear water features (for example, dams, culverts, and streams) and the outer boundary of the water feature areas (for example, lakes and ponds) of Lake County, Illinois. The features in the dataset include: dams, culverts, local drainage; and the outer boundary of lakes, ponds, detention/retention basins, river/streams/creeks greater than five feet wide, and islands. The data has not been field verified and errors and/or omissions may be present. The names used for the water bodies were collected from a number of sources including: existing datasets, historic maps and/or atlases, US Geologic Survey (USGS) Geographic Names Information System (GNIS), current and historical USGS topographic quadrangle maps, local publications on place names within the county, and platted subdivisions. The dataset was traced from aerial photography captured between April 13 and April 26, 2002. The water features were compiled using softcopy analytical stereoplotters. This dataset should meet National Map Accuracy Standards for a 1:1200 product and it is georeferenced to the Illinois State Plane, Eastern Zone, using the NAD83 HARN horizontal datum. Attribute Descriptions: TYPE Codes: 1 Lake 2 Pond 4 River/Stream 5 Island 8 Detention Basin 11 Dam - single line 12 Culvert - single line 39 Local drainage, apparent 44 Stream less than five feet in width 99 Out area GISID: Unique identifier. Survey township, range, section, quarter section and a sequential number. The ID is based on the point of origin of a linear feature.本数据集涵盖伊利诺伊州莱克县的线性水体要素（如水坝、涵洞、溪流）及各类水体区域的外边界（如湖泊、池塘）。 数据集包含的要素包括：水坝、涵洞、本地排水设施，以及宽度大于5英尺的湖泊、池塘、滞留/调蓄池、河流/溪流/小溪，还有岛屿的外边界。 本数据未经过野外实地验证，可能存在错误或疏漏。 水体名称采集自多类渠道，包括现有数据集、历史地图及图集、美国地质调查局（USGS）地理名称信息系统（GNIS）、现行与历史版USGS地形分幅地图、本县本地地名出版物，以及已勘测备案的细分地块。 本数据集由2002年4月13日至26日拍摄的航空影像数字化描制而成。 水体要素通过软拷贝解析立体测图仪完成编绘工作。 本数据集应符合1:1200比例尺产品的国家地图精度标准，并采用NAD83 HARN水平基准面，配准至伊利诺伊州平面坐标系东带。 属性说明： 类型代码：1 湖泊 2 池塘 4 河流/溪流 5 岛屿 8 滞留池 11 水坝（单线要素）12 涵洞（单线要素）39 疑似本地排水设施 44 宽度不足5英尺的溪流 99 外部区域 GISID：唯一标识符，由勘测乡镇、测量范围、地块、四分之一地块及顺序编号组成，该标识符基于线性要素的起始点生成。