Hydrology Polygon 2024

This dataset is Elevation-Derived Hydrography (EDH) for Hamilton County located in Indiana. The EDH contains line features representing streams and rivers and polygons representing waterbodies. The EDH was derived from a 2-foot lidar-derived Digital Elevation Model (DEM), acquired in 2024. This dataset meets the requirements of the USGS Elevation-Derived Hydrography Data Acquisition Specifications (2023 rev. A2) and READ Rules. The line features contain Elevation Class (EClass) codes useful for hydro-enforcement, including culvert identification. Feature Class (FClass) and Feature Codes (FCodes) are hydrography codes compatible with the National Hydrography Dataset (NHD), now retired.本数据集为印第安纳州汉密尔顿县的高程派生水文数据（Elevation-Derived Hydrography，EDH）。该数据集包含代表溪流与河道的线要素，以及代表水体的面要素。本高程派生水文数据由2024年获取的2英尺分辨率激光雷达派生数字高程模型（Digital Elevation Model，DEM）生成。本数据集符合美国地质调查局（USGS）《高程派生水文数据采集规范（2023年修订版A2）》及READ规则的要求。线要素包含适用于水文监管的高程等级（Elevation Class，EClass）编码，涵盖涵洞识别功能。要素类（Feature Class，FClass）与要素编码（Feature Codes，FCodes）为与国家水文数据集（National Hydrography Dataset，NHD）兼容的水文编码，该数据集现已停用。