Layers:

Layer: ASIS_Physical_Boundary_2020 (0)


Name: ASIS_Physical_Boundary_2020

Display Field: Shape_Length

Type: Feature Layer

Geometry Type: esriGeometryPolygon

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.



Copyright Text: 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.

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

XMin: 464947.1659
YMin: 4189102.1788
XMax: 492445.2058
YMax: 4241968.39239714
Spatial Reference: 102387 (6347)


Drawing Info:

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HasZ: true

HasM: false

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Name : OBJECTID

IsSystemMaintained : True


Global ID Field: GlobalID

Type ID Field:

Fields:
• OBJECTID (type: esriFieldTypeOID, alias: OBJECTID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
• Shape__Area (type: esriFieldTypeDouble, alias: Shape__Area, SQL Type: sqlTypeDouble, nullable: true, editable: false)
• Shape__Length (type: esriFieldTypeDouble, alias: Shape__Length, SQL Type: sqlTypeDouble, nullable: true, editable: false)
• GlobalID (type: esriFieldTypeGlobalID, alias: GlobalID, SQL Type: sqlTypeOther, length: 38, nullable: false, editable: false)

Templates:

Name: ASIS_Physical_Boundary_2020
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:


Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 2/3/2021 2:38:15 PM

Schema Last Edit Date: 2/3/2021 2:38:15 PM

Data Last Edit Date: 2/3/2021 2:38:15 PM