Name: Harford 30 years Shoreline Erosion Level

Display Field: SOURCE_ID

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: To quantify shoreline rates of change (erosion or accretion), Maryland Geological Survey (MGS) used historical and recent shorelines spanning 1972-2007 as input into the Digital Shoreline Analysis System (DSAS) Version 4.3. DSAS, a computer program developed by the U.S. Geological Survey (USGS), determines linear rates of shoreline change along closely spaced, shore-normal transects. Based on DSAS output, MGS assigned generalized rate of change categories as attributes to a recent shoreline for Harford County. This recent shoreline consisted of the National Oceanic and Atmospheric Administration (NOAA) Continually Updated Shoreline Product (CUSP) digital shoreline currently available for Harford County. Based on the results of an End Point Rate (EPR) analysis on the ca. 1970s NOAA National Shoreline data sets and the ca. 2000 NOAA CUSP shoreline (recent shoreline), MGS grouped the rate results into the following general categories: (a) No change (-0.01 to 0.01 feet/year), (b) Accretion (greater than 0.01 feet/year), (c) Slight erosion rate (0 to -2 feet/year), (d) Low erosion rate (-2 to -4 feet/year), (e) Moderate erosion rate (-4 to -8 ft/yr), (f) High erosion rate (greater than -8 feet/year), (g) Protected, (h) No data (insufficient shorelines to calculate 30-year EPR rate), (i) No data (no transects cast; unprotected or unknown shoreline condition), and (j) Rates not delivered (calculated rates suspect). The CUSP shoreline represents the shoreline position in Harford County between the years 2005-2007. Negative rate of change values indicate erosion, and positive values indicate accretion. In general, MGS tried to attribute lengths of shoreline of at least 80 meters in length sharing similar rates of change.

Copyright Text: MD iMAP, DNR

Default Visibility: true

MaxRecordCount: 65000

Supported Query Formats: JSON, geoJSON

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Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

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Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -8501648.5491
YMin: 4761039.331900001
XMax: -8466937.4848
YMax: 4809419.193099998
Spatial Reference: 102100  (3857)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: Erosion_Level
Field 2: null
Field 3: null
Field Delimiter: ,
Default Symbol:
N/A
Default Label: null
UniqueValueInfos:
• Value: No change
  Label: No change
  Description:
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  Width: 1
• Value: Accretion
  Label: Accretion
  Description:
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• Value: Slight
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Labeling Info:

Advanced Query Capabilities:

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Supports Sql Expression: true
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HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: GIS Object ID )
• SOURCE_ID ( type: esriFieldTypeString, alias: Source ID, length: 8 )
• SRC_DATE ( type: esriFieldTypeString, alias: Source Date, length: 8 )
• HOR_ACC ( type: esriFieldTypeString, alias: Horizontal Accuracy (m), length: 6 )
• INFORM ( type: esriFieldTypeString, alias: Additional Information, length: 50 )
• ATTRIBUTE ( type: esriFieldTypeString, alias: Attribute, length: 50 )
• VER_DATE ( type: esriFieldTypeString, alias: Verification Date, length: 8 )
• SRC_RESOLU ( type: esriFieldTypeDouble, alias: Source Resolution )
• DATA_SOURC ( type: esriFieldTypeString, alias: Data Source, length: 32 )
• EX_METH ( type: esriFieldTypeString, alias: Extraction Method, length: 10 )
• DAT_SET_CR ( type: esriFieldTypeString, alias: Data Set Credit, length: 50 )
• SRC_CITA ( type: esriFieldTypeString, alias: Source Citation, length: 50 )
• FIPS_ALPHA ( type: esriFieldTypeString, alias: FIPS State Alpha Code, length: 2 )
• NOAA_Regio ( type: esriFieldTypeString, alias: NOAA Region, length: 32 )
• DSAS_DATE ( type: esriFieldTypeString, alias: DSAS Shoreline Segment Date, length: 10 )
• DSAS_UNC ( type: esriFieldTypeDouble, alias: DSAS Horizontal Positional Accuracy Uncertainty (m) )
• DSAS_SRC ( type: esriFieldTypeString, alias: DSAS Source, length: 10 )
• DSAS_DEC ( type: esriFieldTypeSmallInteger, alias: DSAS Decade Identifier )
• DSAS_CO ( type: esriFieldTypeString, alias: DSAS County, length: 25 )
• DSAS_NPROJ ( type: esriFieldTypeString, alias: DSAS NOAA Project, length: 10 )
• DSAS_SLINF ( type: esriFieldTypeString, alias: DSAS Shoreline Information, length: 25 )
• Level_ID ( type: esriFieldTypeDouble, alias: Level ID )
• Erosion_Level ( type: esriFieldTypeString, alias: Erosion Level, length: 50 )
• Erosion_ft ( type: esriFieldTypeString, alias: Erosion Feet, length: 100 )
• Notes ( type: esriFieldTypeString, alias: Notes, length: 100 )
• Shape ( type: esriFieldTypeGeometry, alias: GIS Shape )
• Shape.STLength() ( type: esriFieldTypeDouble, alias: Shape.STLength() )

Supported Operations:   Query   Generate Renderer   Return Updates

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