{
 "culture": "en-US",
 "name": "",
 "guid": "",
 "catalogPath": "",
 "snippet": "The purpose of this Elevation-Derived Hydrography (EDH) dataset is to support Hamilton County's geospatial, planning, and water resource management workflows with an accurate, current, and 3D-integrated hydrographic representation. The data were developed from high-resolution QL1 lidar in accordance with USGS 3D Hydrography Program (3DHP) specifications. This vector hydrography content improves upon historic NHD datasets by offering more spatially accurate flowlines and waterbody features derived directly from recent lidar elevation surfaces. The EDH dataset is being integrated with Hamilton County's existing inventories of Legal Drains, Storm Sewer Networks, and Wetlands to support advanced hydrologic modeling, drainage assessment, regulatory compliance, and infrastructure planning. It also supports flood risk analysis, watershed delineation, culvert and outfall mapping, and long-term environmental planning. Hamilton County plans to contribute the eight (8) complete HUC-12 areas in Hamilton County to the USGS National Geospatial Program (NGP) through the \"USGS 3DNTM Data Collaboration Announcement (DCA)\" for integration into the USGS 3D National Topographic Model (3DNTM).",
 "description": "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.",
 "summary": "The purpose of this Elevation-Derived Hydrography (EDH) dataset is to support Hamilton County's geospatial, planning, and water resource management workflows with an accurate, current, and 3D-integrated hydrographic representation. The data were developed from high-resolution QL1 lidar in accordance with USGS 3D Hydrography Program (3DHP) specifications. This vector hydrography content improves upon historic NHD datasets by offering more spatially accurate flowlines and waterbody features derived directly from recent lidar elevation surfaces. The EDH dataset is being integrated with Hamilton County's existing inventories of Legal Drains, Storm Sewer Networks, and Wetlands to support advanced hydrologic modeling, drainage assessment, regulatory compliance, and infrastructure planning. It also supports flood risk analysis, watershed delineation, culvert and outfall mapping, and long-term environmental planning. Hamilton County plans to contribute the eight (8) complete HUC-12 areas in Hamilton County to the USGS National Geospatial Program (NGP) through the \"USGS 3DNTM Data Collaboration Announcement (DCA)\" for integration into the USGS 3D National Topographic Model (3DNTM).",
 "title": "Elevation-Derived Hydrography for Hamilton County, Indiana",
 "tags": [
  "inlandWaters",
  "elevation",
  "hydrography",
  "lidar",
  "connector",
  "indefinite surface connector",
  "culvert",
  "terrain breach",
  "canal/ditch",
  "dam/weir",
  "lake/pond",
  "stream/river",
  "drainageway",
  "artificial path",
  "3DNTM",
  "3DEP",
  "QL1 Lidar",
  "3DHP",
  "EDH",
  "United States",
  "Indiana",
  "Hamilton County",
  "05120201"
 ],
 "type": "",
 "typeKeywords": [],
 "thumbnail": "",
 "url": "",
 "minScale": "NaN",
 "maxScale": "NaN",
 "spatialReference": "",
 "accessInformation": "Hamilton County GIS, Dewberry Engineers Inc., United States Geological Survey",
 "licenseInfo": "None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the Hamilton County GIS Department would be appreciated for products derived from these data.",
 "portalUrl": ""
}