Elevation Derived Hydrography for 140G0221D0012 PA_Allegheny_B25_H

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:NV5 Geospatial

Publication_Date:20260313

Title:

Elevation Derived Hydrography for 140G0221D0012 PA_Allegheny_B25_H

Geospatial_Data_Presentation_Form:vector digital data

Description:

Abstract:

This dataset is Elevation-derived hydrography (EDH) for the 140G0221D0012 PA_Allegheny_B25_H project covering work unit 301221. The hydrography layer contains line features representing stream rivers and polygons representing waterbodies. The EDH was derived from 1 meter lidar Digital Elevation Models. This dataset was created to meet the requirements of the USGS Elevation-derived hydrography specification, https://www.usgs.gov/core-science-systems/ngp/ss/elevation-derived-hydrography-specifications. 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). 

Purpose:

The EDH data was created to be ingested into the 3DHydrography Program(3DHP), with the aim of better aligning hydrography features with 3DEP elevation datasets horizontally and vertically. These data have been created such that they may be used for hydro-enforcement.

Supplemental_Information:

This dataset represents the work unit 301221 of the 140G0221D0012 PA_Allegheny_B25_H project.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:20260313

Currentness_Reference:

Publication date

Status:

Progress:Complete

Maintenance_and_Update_Frequency:Not planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate:-80.231229

East_Bounding_Coordinate:-79.667597

North_Bounding_Coordinate:40.729571

South_Bounding_Coordinate:40.261740

Keywords:

Theme:

Theme_Keyword_Thesaurus:ISO 19115 Topic Category

Theme_Keyword:inlandWaters

Theme_Keyword:elevation

Theme:

Theme_Keyword_Thesaurus:None

Theme_Keyword:hydrography

Theme_Keyword:connector

Theme_Keyword:indefinite surface connector

Theme_Keyword:culvert

Theme_Keyword:terrain breach

Theme_Keyword:canal/ditch

Theme_Keyword:dam/weir

Theme_Keyword:lake/pond

Theme_Keyword:pipeline

Theme_Keyword:reservoir

Theme_Keyword:sink/rise

Theme_Keyword:stream/river

Theme_Keyword:drainageway

Theme_Keyword:artificial path

Theme_Keyword:sea/ocean

Place:

Place_Keyword_Thesaurus:None

Place_Keyword:United States

Place_Keyword:Pennsylvania

Place_Keyword:Work Unit - 301221

Access_Constraints:None. Please see 'Distribution Info' for details.

Use_Constraints:

For internal use only by the US Geological Survey unless prior arrangements have been made.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person:Cathy Power

Contact_Organization:NV5 Geospatial

Contact_Address:

Address_Type:mailing and physical

Address:

1100 NE Circle Blvd, Suite 126

City:Corvallis

State_or_Province:OR

Postal_Code:97330

Contact_Voice_Telephone:(541) 752-1204

Contact_Electronic_Mail_Address:cathy.power@nv5.com

Data_Set_Credit:

USGS

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

All features should contain attributes defined in the USGS Elevation-derived specification.
    

Logical_Consistency_Report:

All features meet EDH topology rules. 
Points, nodes, lines, and areas conform to topological rules. Lines intersect only at nodes, and all nodes anchor the ends of lines. Lines do not overshoot or undershoot other lines where they are supposed to meet. There are no duplicate lines. Gaps and overlaps among areas do not exist. 
The EDH was compared to the 1 meter lidar Digital Elevation Model and channels present within the surface that meet minimum mapping requirements were added to the EDH.
The EDH was compared to the original NHD for the study area and any feature from the NHD that did not have a channel representation in the DEM were excluded. 
Stream connectivity was checked and any isolated networks were verified. 
Features added without clear channels present in the DEM are allowed if added as drainageways or indefinite surface connectors, or if DEM limitations are found and documented. 

Completeness_Report:

The completeness of the data is relative to the DEM from which the EDH was derived, and must match the DEM withing relevant thresholds. The goal of this product is to be vertically and horizontally integrated with the 3DEP bare earth DEM. 
Published NHD is used as a guide for feature extraction and densification, but was not used as a source to verify the presence or absence of features.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

All stream/river linear features should be placed within a channel of the bare earth DEM. Waterbody features should be placed at the apparent limit or banks of the waterbody. 
If hydro-flattening is present in the source DEM, waterbodies should match the hydro-flattening breakline extent within relevant thresholds. 

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

All features should have z-values associated with every vertex. 
Linear features should be flat or flow consistently downstream. 
Z-values are at, or just below, the surface of the DEM. Exceptions are allowed to maintain monotonicity and through connectors.
Waterbodies that do not flow are flat and the z-value are at or just below the surface of the DEM at the edge of the polygon.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:USGS

Publication_Date:20201222

Title:

PA_WesternPA_1_2019

Geospatial_Data_Presentation_Form:raster digital data

Other_Citation_Details:

provide citation information to the source lidar data used for this project.

Online_Linkage: https://usgs.gov/

Type_of_Source_Media:Digital

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date:20191118

Ending_Date:20200309

Source_Currentness_Reference:

Ground Condition

Source_Citation_Abbreviation:

3DEP lidar data source

Source_Contribution:

Bare earth Digital Elevation Model (DEM) used for generating point, line, and polygon vector water features; identifying flat water bodies; and populating z-values. 

Source_Information:

Source_Citation:

Citation_Information:

Originator:USGS

Publication_Date:20210305

Title:

PA_WesternPA_2_2019

Geospatial_Data_Presentation_Form:raster digital data

Other_Citation_Details:

provide citation information to the source lidar data used for this project.

Online_Linkage: https://usgs.gov/

Type_of_Source_Media:Digital

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date:20191125

Ending_Date:20200322

Source_Currentness_Reference:

Ground Condition

Source_Citation_Abbreviation:

3DEP lidar data source

Source_Contribution:

Bare earth Digital Elevation Model (DEM) used for generating point, line, and polygon vector water features; identifying flat water bodies; and populating z-values. 

Process_Step:

Process_Description:

        Data was collected using a combination of flow directions and accumulation routines, manual digitization, and proprietary processing and QAQC methods. All data was manually reviewed.  
		    Polygons - Waterbody polygons were created using the existing lidar breaklines combined with newly digitized polygons for Lakes, Ponds, and Reservoirs  approximately > .4 hectares and streams and canals > 15m nominal width in accordance with EDH specification. 
        Additionally, all features previously existing in the NHD were captured and updated. Minimum vertex spacing is 1.5 meters.
		    Polylines - Polylines were captured in accordance with EDH specifications including all features previously existing in the NHD if evidence of the feature was present in the ground model.  Connectivity was established using geometric network tracing.  All features were traversed.
        

Source_Used_Citation_Abbreviation:

PA_WesternPA_1_2019, PA_WesternPA_2_2019

Process_Date:20260313

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method:Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type:String

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name:Albers

Albers_Conical_Equal_Area:

Albers

Standard_Parallel:55.0

Standard_Parallel:65.0

Longitude_of_Central_Meridian:-154

Latitude_of_Projection_Origin:23.0

False_Easting:0

False_Northing:0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method:coordinate pair

Coordinate_Representation:

Abscissa_Resolution:0.001

Ordinate_Resolution:0.001

Planar_Distance_Units:meters

Geodetic_Model:

Horizontal_Datum_Name:D NAD 1983 2011

Ellipsoid_Name:Geodetic Reference System 80

Semi-major_Axis:6378137.0

Denominator_of_Flattening_Ratio:298.257222101

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name:NAVD88 - EPSG:5703

Altitude_Resolution:0.001

Altitude_Distance_Units:meters

Altitude_Encoding_Method:Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Entity and Attribute information for datasets collected for EDH version 1.5 can be found in the Elevation-Derived Hydrography Acquisition Specifications 2024 rev. A3, which is available online at https://www.usgs.gov/ngp-standards-and-specifications/elevation-derived-hydrography-data-acquisition-specifications. Specifically, tables  3 through 12 contain Feature type descriptions, domain values and descriptions. 

Entity_and_Attribute_Detail_Citation:

USGS 3D Hydrography Program, 2024,  Elevation-Derived Hydrography Acquisition Specifications 2024 rev. A3, https://www.usgs.gov/ngp-standards-and-specifications/elevation-derived-hydrography-data-acquisition-specifications.

Terziotti, S., and Archuleta, C.M., 2022 rev A, Elevation-Derived Hydrography Acquisition Specifications: U.S. Geological Survey Techniques and Methods, book 11, chap. B11, 74 p., https://www.usgs.gov/ngp-standards-and-specifications/elevation-derived-hydrography-specifications. 

Archuleta, C.M., and Terziotti, S., 2022 rev A, Elevation-Derived Hydrography—Representation, Extraction, Attribution, and Delineation Rules: U.S. Geological Survey Techniques and Methods, book 11, chap. B12, 60 p., https://www.usgs.gov/ngp-standards-and-specifications/elevation-derived-hydrography-specifications.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Pennsylvania Spatial Data Access (PASDA)

Contact_Address:

Address_Type:mailing and physical address

Address:

115 Land and Water Building

City:University Park

State_or_Province:Pennsylvania

Postal_Code:16802

Country:United States

Contact_Voice_Telephone:(814) 865 - 8792

Contact_Electronic_Mail_Address:pasda@psu.edu

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.

Metadata_Reference_Information:

Metadata_Date:20260313

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person:Cathy Power

Contact_Organization:NV5 Geospatial

Contact_Address:

Address_Type:mailing and physical

Address:

*Street Address*

City:Corvallis

State_or_Province:Oregon

Postal_Code:97330

Country:USA

Contact_Voice_Telephone:(541) 752-1204

Contact_Electronic_Mail_Address:cathy.power@nv5.com

Metadata_Standard_Name:Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version:FGDC-STD-001-1998

Metadata_Time_Convention:local time