Service Description: This polygon feature portrays Assateague Island National Seashore's physical boundary, defined by the island's physical extent, including ocean and bay...
Service ItemId: b6d9c1c053884cd2989e7c801a8d0931
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: True
Supports Shared Templates: False
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Description: This dataset was developed by digitizing 2018 USGS LiDAR-derived marsh boundaries and 2019 ASIS ocean and bayside shoreline surveys. Ocean shorelines are based entirely on ASIS surveys, while bayside shorelines are based on both USGS LiDAR and ASIS surveys. ASIS bayside surveys were measured only for the northernmost 9.5 kilometers of the island and the southernmost 5 kilometers including Tom's Cove and hook. The remaining bayside shoreline was not surveyed by ASIS due to limited accessibility. Where USGS LiDAR and ASIS surveys overlapped, more recent ASIS surveys were used. LiDAR data holes were verified using 2019 State of Maryland aerial imagery and best available imagery for Virginia. Holes that were isolated from the bay were included in the physical boundary polygon, while holes with direct connections to the bay were not included in the physical boundary. Channel connections to the bay were digitized and excluded from the physical boundary using aerial imagery.
The National Park Service shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics (i.e. GIF or JPG format files) are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. The related graphics are intended to aid the data user in acquiring relevant data; it is not appropriate to use the related graphics as data. The National Park Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from an NPS server and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully on computer systems at the National Park Service, no warranty expressed or implied is made regarding the utility of the data on other systems for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.
Spatial Reference: 102387 (6347)
Initial Extent:
XMin: 440650.179432211
YMin: 4186458.86812014
XMax: 516742.192267789
YMax: 4244611.703077
Spatial Reference: 102387 (6347)
Full Extent:
XMin: 464947.1659
YMin: 4189102.1788
XMax: 492445.2058
YMax: 4241968.39239714
Spatial Reference: 102387 (6347)
Units: esriMeters
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