Service Description: Contour lines for Gateway National Recreation Area.
Service ItemId: 2e97ac60e38842d98831ca743db8d899
Has Versioned Data: false
Max Record Count: 1000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: True
Supports Shared Templates: False
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Description: Contour lines for Gateway National Recreation Area at 2 meter intervals.
The source data (LiDAR LAS files) were processed by Woolpert Inc. to determine that no voids existed within the coverage. The point cloud then underwent classification into ASPRS LiDAR classes, including a manual QA/QC on the bare earth points to ensure all artifacts were removed correctly. Ground control points were used to perform accuracy checks. When LAS files received by NOAA, classes 11 (unknown), 15 (unknown) and 17 (default overlap) were combined and assigned to class 12 (overlap). This data was then downloaded from the NOAA Coastal Services Center, this data was input into a mosaic dataset where ground returns were selected to create a bare earth DEM for each park unit. The Focal Statistics tool (Spatial Analyst) was then used to create a smoothed bare earth DEM for each park unit. This analysis used a circle neighborhood at a 5 (SIU & SHU) and 8 (JBU) map unit radius with a mean statistics type. The Contour tool (Spatial Analyst) was then used to create contours lines at 2 meter intervals. These data were then edited to remove all contour lines less than or equal to zero. This was done as a "zero" elevation contour do not indicate seal level and inaccurately depict the coastline, discouraging misuse of these data.
The source LiDAR data was downloaded from the NOAA Coastal Services Center Digital Access Viewer.
Copyright Text: USACE, NOAA, URI EDC
Spatial Reference: 102100 (3857)
Initial Extent:
XMin: -8255055.48011259
YMin: 4935056.43515659
XMax: -8214656.76649189
YMax: 4969365.19344044
Spatial Reference: 102100 (3857)
Full Extent:
XMin: -8253212.2354
YMin: 4923914.5889
XMax: -8216607.3543
YMax: 4962058.684
Spatial Reference: 102100 (3857)
Units: esriMeters
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