LiDAR - Hydro Enforced Digital Terrain Model [District of Columbia--Washington] {2018}
D.C. Office of the Chief Technology Officer
·
2018
Full Details
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- Title
- LiDAR - Hydro Enforced Digital Terrain Model [District of Columbia--Washington] {2018}
- Description
- The hydro-flattened bare earth DEM was generated using the 2018 DC lidar bare earth points and 3D hydro breaklines to a resolution of 1 m. The bare earth points that fell within 1NPS along the hydro breaklines were excluded from the DEM generation process and put into class 20 - ignored ground. This is analogous to the removal of mass points for the same reason in a traditional photogrammetrically compiled DTM. This process was done in batch using proprietary software. The technicians then used proprietary software for the production of the lidar-derived hydro-flattened bare earth DEM surface in initial grid format at 1 m GSD. Water bodies (inland ponds and lakes), inland streams and rivers, and island holes were hydro-flattened within the DEM. Once the initial, hydro-flattened bare earth DEM was generated, the tiles were checked to ensure that the grid spacing met specifications. The surface was also checked to ensure proper hydro-flattening.This dataset provided as an ArcGIS Image service. Please note, the download feature for this image service in Open Data DC provides a compressed PNG, JPEG or TIFF. The compressed GeoTIFF raster dataset is available under additional options when viewing downloads.
- Creator
- D.C. Office of the Chief Technology Officer
- Temporal Coverage
- 2018
- Date Issued
- 2019-11-06
- Rights
- http://creativecommons.org/licenses/by/4.0
- Access Rights
- Public
- Format
- Imagery
- Language
- English
- Date Added
- March 08, 2023
