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CreateMosaicDataset E:\ProductionFiles\Lidar_2018\Lidar_2018.gdb DTM PROJCS["NAD_1983_StatePlane_Maryland_FIPS_1900",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",400000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-77.0],PARAMETER["Standard_Parallel_1",38.3],PARAMETER["Standard_Parallel_2",39.45],PARAMETER["Latitude_Of_Origin",37.66666666666666],UNIT["Meter",1.0]],VERTCS["NAVD88 Geoid 12B",VDATUM["North_American_Vertical_Datum_1988"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Meter",1.0]] # # None #
AddRastersToMosaicDataset E:\ProductionFiles\Lidar_2018\Lidar_2018.gdb\DTM "Raster Dataset" E:\ProductionFiles\Lidar_2018\Hydro_Enforced_DTM UPDATE_CELL_SIZES UPDATE_BOUNDARY NO_OVERVIEWS # 0 1500 # # SUBFOLDERS "Allow duplicates" NO_PYRAMIDS NO_STATISTICS NO_THUMBNAILS # NO_FORCE_SPATIAL_REFERENCE NO_STATISTICS # NO_PIXEL_CACHE C:\Users\brian.putz\AppData\Local\ESRI\rasterproxies\DTM
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FGDC
GIS Data Coordinator
D.C. Office of the Chief Technology Officer
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
20230901
ArcGIS Metadata
1.0
GIS Data Coordinator
D.C. Office of the Chief Technology Officer
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
DC datasets can be downloaded from "http://opendata.dc.gov".
Hydro_Enforced_DTM_2018
2018-11-02
remote-sensing image
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Hydro-Flattened Bare Earth DTM. The dataset was created using the lidar bare earth points and 3D hydro breaklines to a resolution of 1 m (April 2018).Voids exist in the data due to data redaction conducted under the guidance of the United States Secret Service. All lidar data returns and collected data were removed from the dataset based on the redaction footprint shapefile generated in 2017.</SPAN></P></DIV></DIV></DIV>
This data is used for the planning and management of Washington, D.C. by local government agencies.
GIS Data Coordinator
D.C. Office of the Chief Technology Officer
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
Washington D.C., DC, District of Columbia
lidar, 2018, dtm, topography, bare earth, elevation, DC GIS, DCGIS
ISO 19115 Topic Categories
elevation
lidar
2018
dtm
topography
bare earth
elevation
DC GIS
DCGIS
elevation
Washington D.C.
DC
District of Columbia
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This work is licensed under a Creative Commons Attribution 4.0 International License.</SPAN></P></DIV></DIV></DIV>
See access and use constraints information.
Esri ArcGIS 10.5.0.6491
true
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38.791510
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39.001746
38.785481
The hydro-flattened bare earth DEM was generated using the 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 Fugro 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. The entire dataset was reviewed for complete project coverage and then converted to Geotiffs.
Fugro Geospatial, Inc.
(301) 948-8550
7320 Executive Way # 107
Frederick
MD
21704
The lidar acquisition was flown in a single lift on April 5, 2018, at an altitude of 9,700 feet above mean sea level and composed of 24 flight lines, 22 primary lines and two cross ties. All lidar data was collected with a Piper Navajo PA31-50 and a Leica ALS80 lidar sensor, #133. Due to the known difficulties flying over DC, the ALS80 sensor was selected to take advantage of its flight altitude and speed, minimizing the number of lifts for the various flight restrictions. All lidar was collected in conjunction with airborne GPS.
ground condition
2018-04-05
The hydro-breaklines were collected in 2D as vector line work, using a combination of classified lidar dataset, intensity images, shaded relief TIN and contours. The hydro features were collected to the following specifications: double line rivers and streams greater than 10’ in width, ponds or lakes greater than .5 acre, and islands greater than .25 acre. After the breaklines have been collected, vertex elevation values were assigned using a distance weighted distribution of the lidar points closest to each vertex (similar to draping the 2D linework to a surface modelled from the lidar points). The linework elevation values were further adjusted based on the following rules: 1) lake feature vertices were re-assigned (flattened) to the lowest draped vertex value, and 2) double stream bank line vertices were re-assigned based on the vertices of the closest adjusted double stream connector line. Fugro proprietary software was used to create profiles to ensure bank-to-bank flatness, monotonicity check and lake flatness.
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