Pennsylvania Spatial Data Access

Abstract:

The 3D Hydrography Program (3DHP) data is an integrated, National, 3D-enabled hydrologic dataset derived from the USGS 3D Elevation Program (3DEP) data. For areas where Elevation-derived Hydrography (EDH) has not yet been collected, 3DHP data is supplemented by hydrologic vector data from the National Hydrography Dataset (NHD). As further EDH data is collected, it will replace the NHD data in those areas. 3DHP data ingested from EDH sources includes ‘value added’ catchments and flowline network derivative attributes. All the data is open and non-proprietary. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. This dataset is not intended to be used for site-specific regulatory determinations. 3DHP datasets include a three-dimensional (3D) hydrography network generated from, and integrated with, elevation data from the 3DEP to better represent stream gradients and channel conditions, along with waterbodies, hydrologic units, hydrologically enhanced elevation and other surfaces, and more consistent and accurate attributes. This product is new in federal fiscal year 2025 (FY25), and consists only of vector data in a series of feature classes. The product represents the 3DHP dataset and the schema in which it is contained as of September 30, 2024 Future Annual Staged Product releases will reflect the schema at the time the product is generated and include more EDH-sourced data holdings.

Purpose:

These data create a scalable 3D-in-part geospatial hydrography framework for general purpose use in geospatial analysis, visualization, modeling, cartography and other use cases

Currentness_Reference:

20250107

Use_Constraints:

All data are open and non-proprietary. Users should be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from these data

Address:

12201 Sunrise Valley Drive

Data_Set_Credit:

U.S. Geological Survey

Attribute_Accuracy_Report:

Attributes are not systematically verified. Attribute errors may be present.

Logical_Consistency_Report:

Topological tests have not been completed, some disconnected features are possible.

Completeness_Report:

Not all hydrologic features on the ground (e.g. stream/river, lake/pond, etc.) may be mapped, and changes may have occurred since originally mapped. The level of mapping detail varies by geographic area. The USGS jointly manages these data with local and regional data stewards, usually at the State level, and some variations in content occur based on differences in local/regional stewardship.

Horizontal_Positional_Accuracy_Report:

Horizontal accuracy for source data may be available in the original source product metadata file where available.

Vertical_Positional_Accuracy_Report:

Vertical accuracy for elevation data may be available in the original source product metadata file where available.

Source_Contribution:

Elevation-Derived Hydrography (EDH) is a method used by the U.S. Geological Survey (USGS) to create accurate water flow pattern maps and surface water datasets. EDH utilizes lidar and IFSAR data, human-built features, and landscape classifications. EDH was used for populating the hydrologic unit 19050401 in Alaska.

Source_Contribution:

NHD data was used for 3DHP 'national backbone', that is to get hydrologic coverage across the Nation. It was created in conjunction with the most current WBD, and 3DEP DEMs to create a hydro-enforced DEM for generation of the catchment raster and feature class, and flow direction/accumulation rasters, and used to compute and assign NHDFlowline Value Added Attributes (VAAs) in 3DHP (more details are available in the product's ReadMe file included as part of this dataset.)

Process_Description:

NHD data were used to populate this initial 3DHP dataset.

Address:

12201 Sunrise Valley Drive

Distribution_Liability:

Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.

Format_Information_Content:

Spatial objects with unique identifiers and coordinate data.

Address:

115 Land and Water building

Distribution_Liability:

The USER shall indemnify, save harmless, and, if requested, defend those parties involved with the development and distribution of this data, their officers, agents, and employees from and against any suits, claims, or actions for injury, death, or property damage arising out of the use of or any defect in the FILES or any accompanying documentation. Those parties involved with the development and distribution excluded any and all implied warranties, including warranties or merchantability and fitness for a particular purpose and makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance. Those parties involved with the development and distribution of this data will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.

Address:

12201 Sunrise Valley Drive

3D Hydrography Program (3DHP) (Clipped to Pennsylvania) (published 20250320) FileGDB