Elevation-Derived Hydrography Data Acquisition Specifications: Table of Contents
The current version of the Elevation-Derived Hydrography Data Acquisition Specifications is 2023 rev. A2
Table of Contents
The major headings link to pages which contain the specifications for that section.
Current Revision as PDF
- Elevation-Derived Hydrography Data Acquisition Specifications 2023 rev. A2 (.pdf)
Introduction
Collection Area
Spatial Reference System
Attribute Table Structure
Feature Codes and Values
- 3D Elevation Program Light Detection and Ranging Base Specification Required Hydroflattening Features
- Additional User-Defined Features
Delineation of Hydrographic Features
Topology
Positional Assessment
- Elevation-Derived Hydrography Positional Evaluation and Reporting
- Positional Assessment and Reporting
- Hydroflattening Polygon Exception
- Vertical Positional Assessment of Hydrographic Features Relative to the Digital Elevation Model
- Horizontal Positional Assessment of Elevation-Derived Hydrography
- Linear Features
- Polygonal Features
- Point Features
- Alignment
- Horizontal Alignment
- Vertical Alignment
- Completeness
Metadata
Delivered Products and Formats
References
Tables
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Table 1. Geometry of elevation-derived hydrography feature types.
Table 2. Attribute table structure for line hydrographic features.
Table 3. Attribute table structure for area and point hydrographic features.
Table 4. Domain values for FlowClass feature attributes.
Table 5. Domain values for Limitation feature attributes.
Table 6. FCode domain values and descriptions.
Table 7. Domain values for FClass feature attributes.
Table 8. Domain values for EClass feature attributes.
Table 9. Feature type description, associated geometry, and use classification.
Table 10. Polygon features used for hydroflattening an elevation surface.
Figures
- Figure 1. Hydrography collection within a defined project area based on political boundaries.
- Figure 2. Hydrography collection from existing light detection and ranging source.
- Figure 3. Minimum set of hydrographic features compared to the original National Hydrography Dataset.
- Figure 4. Additional features with visible channels captured from the light detection and ranging-derived elevation surface.
- Figure 5. Artifacts within National Hydrography Dataset density inherited from original quadrangle map delineation of hydrography.
- Figure 6. The hydrography within the southern quadrangles of this 12-digit hydrologic unit must be densified to be consistent with the northern quadrangles.
- Figure 7. The streams within the Roaring River watershed indicate density disparity because of the collection differences between Jackson, Overton, and Putnam Counties, Tennessee.
- Figure 8. Bridge treatment in the bare-earth digital elevation model. The bridge deck is removed, and water surface is interpolated beneath the bridge to maintain a monotonic, continuous water feature.
- Figure 9. Proper delineation of a culvert feature within a stream segment.
- Figure 10. Correcting headwater stream delineation at roads.
- Figure 11. Example map of Drainageway.
- Figure 12: Example map of Indefinite Surface Connector.
- Figure 13. Example map of Terrain Breach Connector.
- Figure 14. Canal/ditch features as part of a hydrologic network. [A denotes features in purple line color that should be included in the network. B denotes features in purple line color that should be removed from the network].
- Figure 15. An area with multiple braided channels visible in the elevation surface.
- Figure 16. The minimum number of Stream/river features delineated to represent a braided channel system.
- Figure 17. Two cross-sectional views of transects intersecting two stream/river segments. A. This stream/river segment has deviated horizontally from the main channel but is still vertically integrated with the elevation surface. B. This segment is well integrated vertically and horizontally with the lidar-derived surface. Both segments’ elevation values are within 0.1 meter of the elevation values of the surface.
- Figure 18. An example of poor horizontal alignment. There are many instances in which the streams (in blue) fall outside the apparent channel of the elevation-derived surface.
Elevation-Derived Hydrography Acquisition Specifications Revision History
- Elevation-Derived Hydrography Data Acquisition Specification 2023 rev. A2 (pdf)
- Elevation-Derived Hydrography Data Acquisition Specifications 2022 rev. A (pdf)
- Elevation-Derived Hydrography Data Acquisition Specifications 2021 rev. A (pdf)
- Elevation-Derived Hydrography Data Acquisition Specifications 2020 rev. A (pdf)
- Elevation-Derived Hydrography Data Acquisition Specifications - Original Report