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CreateMosaicDataset E:\ProductionFiles\Lidar_2018\Lidar_2018.gdb nDSM 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["NAVD_1988_Geoid_12B",VDATUM["North_American_Vertical_Datum_1988"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Meter",1.0]] # # None #
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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
20181109
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".
nDSM_2018
2018-11-02
remote-sensing image
Normalised Digital Surface Model - 1m resolution. The dataset contains the Normalised Digital Surface Model for the Washington Area.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.
1 m resolution nDSM from lidar flown on April 5, 2018.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, ndsm, topography, bare earth, elevation, Digital Surface Model, DC GIS, DCGIS
elevation
ISO 19115 Topic Categories
lidar
2018
ndsm
topography
bare earth
elevation
Digital Surface Model
DC GIS
DCGIS
elevation
Washington D.C.
DC
District of Columbia
This work is licensed under a Creative Commons Attribution 4.0 International License.
See access and use constraints information.
Esri ArcGIS 10.5.0.6491
true
-77.119916
-76.909035
38.995971
38.791510
1
-77.122373
-76.900716
39.001746
38.785481
The nDSM used all point returns, except for the noise class, to create a model of all features collected by the data. The nDSM did not undergo hydro-flattening but to improve the appearance and remove artefacts in the water, the hydro shapefile was used to set all water bodies to -5 m, an arbitrary, consistent value to ensure the water is blow the surrounding land to keep low lying features such as docks from appearing underwater. The bridges were masked out of the water polygons before applying the -5 m elevation to ensure they remain in the dataset. The nDSM then went through a visual QC to make sure all noise points have been correctly classified out of the data and that the water elevation was properly applied and free of artefacts. Following the final QC the nDSM was converted to Geotiff and packaged for delivery.
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
2
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EPSG
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Band_1
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32