Web services > LiDAR > District of Columbia--Washington > 2015-2019

2018 LiDAR - Hydro Enforced Digital Terrain Model [District of Columbia--Washington]

Open Data DC · 2018 Full Details

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Full Details

Title
2018 LiDAR - Hydro Enforced Digital Terrain Model [District of Columbia--Washington]
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
Publisher
Open Data DC
Temporal Coverage
2018
Date Issued
2019-11-06
Rights
https://creativecommons.org/licenses/by/4.0
Access Rights
Public
Format
ArcGIS ImageMapLayer
Language
English
Date Added
August 10, 2025
Provenance Statement
The metadata for this resource was last retrieved from Open Data DC on 2026-01-08.

Links

Cite and Reference

  • Citation
    D.C. Office of the Chief Technology Officer (2019). 2018 LiDAR - Hydro Enforced Digital Terrain Model [District of Columbia--Washington]. Open Data DC. https://opendata.dc.gov/datasets/DCGIS::2018-lidar-hydro-enforced-digital-terrain-model (web service)
  • BTAA Geoportal Link

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