20201217
15264700
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CreateMosaicDataset E:\DCGIS\Projects\Lidar_2020\Final\Lidar_2020.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 #
AddRastersToMosaicDataset E:\DCGIS\Projects\Lidar_2020\Final\Lidar_2020.gdb\nDSM "Raster Dataset" E:\DCGIS\Projects\Lidar_2020\Final\nDSM 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\nDSM
CalculateStatistics E:\DCGIS\Projects\Lidar_2020\Final\Lidar_2020.gdb\nDSM 1 1 # OVERWRITE "Feature Set"
AnalyzeMosaicDataset \\Gisimgprd1\e\Productionfiles\Lidar_2020\Lidar_2020.gdb\nDSM # FOOTPRINT;FUNCTION;RASTER;PATHS
nDSM
file://\\Gisimgprd1\e\Productionfiles\Lidar_2020\Lidar_2020.gdb
Local Area Network
389400.000000
408600.000000
124200.000000
148200.000000
1
Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_StatePlane_Maryland_FIPS_1900
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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
20210205
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
DC datasets can be downloaded from " http://opendata.dc.gov ".
nDSM_2020
2021-01-26T00:00:00
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Normalizd Digital Surface Model - 1m resolution. The dataset contains the 1m Digital Surface Model for the District of Columbia.Some areas have limited data. The lidar dataset redaction was conducted under the guidance of the United States Secret Service. Except for classified ground points and classified water points, all lidar data returns and collected data were removed from the dataset within the United States Secret Service 1m redaction boundary generated for the 2017 orthophoto flight</SPAN></P></DIV></DIV></DIV>
1 meter resolution DSM from lidar flown on 6/26/2020, 6/29/2020, and 6/30/2020. 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
Washington D.C., DC, District of Columbia
lidar, 2020, ndsm, topography, bare earth, elevation, Normalized Digital Surface Model, DC GIS, DCGIS
Washington D.C.
DC
District of Columbia
elevation
lidar
2020
ndsm
topography
bare earth
elevation
Normalized Digital Surface Model
DC GIS
DCGIS
See access and use constraints information.
<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>
Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362
-77.122373
-76.900716
38.785481
39.001746
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 sued to set all water bodies to -5 m, an arbitrary, consistent value to ensure the water is below 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 on 6/26/2020, 6/29/2020, and 6/30/2020, at an altitude of 9,022 feet above mean sea level and composed of 28 flight lines, 26 primary lines and two cross ties. All lidar data was collected with a Cessna 441, tail# N93HC and a Leica ALS80 lidar sensor, #130. 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
2020-06-26
2020-06-30
2
24000
1.000000
19200
1.000000
1
0
389400.000000 124200.000000
389400.000000 148200.000000
408600.000000 148200.000000
408600.000000 124200.000000
399000.000000 136200.000000
EPSG
4.5(3.0.1)
Band_1
392.596985
-5.000000
32