View In:   ArcGIS Online Map Viewer

Name: Bottom Classification 2012 CZM Block 2

Display Field: Class

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: QuesterTangent’s SWATHVIEW seabed classification software to post-process the 410 kHz side scan sonar signal. This software analyzes the side scan sonar backscatter signal to produce a classification map based on the acoustical reflectivity characteristics of bottom sediments. Employing proprietary algorithms SWATHVIEW uses multivariate analysis to find patterns in the side scan acoustic backscatter signal which reflect bottom textural parameters. Cluster analysis is used to group together regions of similar acoustic backscatter characteristics, or classes. Once the acoustic classes were determined, they were correlated with bottom samples and imagery. Bottom grab samples were obtained using a Van Veen sampler with a 4-inch depth capacity. Sampling sites were chosen based on the side scan data. We took samples on acoustically distinct bottom types to confirm our estimates of those types. The seabed classification data were layered over the side scan mosaics and bathymetry. These data sets were used to correlate side scan reflectivity with acoustic seabed classes and detect any influences that abrupt changes in seafloor slope may have on the acoustic data. Steep slopes tend to scatter the acoustic signals and produce anomalous data. REFS: Conkwright, R.D., Van Ryswick, S, Sylvia, E.R. 2014. Seafloor Survey of Nearshore Ocean City Maryland. Maryland Geological Survey. Funding to compile these datasets provided by BOEM under cooperative agreement number: M14AC00007. Data processing and compilation was executed by Maryland Geological Survey.

Copyright Text: DNR MGS, MD iMAP

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Supported Query Formats: JSON, geoJSON

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Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Use Standardized Queries: true

Supports ValidateSQL: true

Supports Calculate: true

Extent:

XMin: -8355758.287599999
YMin: 4632512.078599997
XMax: -8347422.2192
YMax: 4641275.886100002
Spatial Reference: 102100  (3857)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: Class
Field 2: null
Field 3: null
Field Delimiter: ;
Default Symbol:
N/A
Default Label: null
UniqueValueInfos:
• Value: sand, gravel
  Label: sand, gravel
  Description:
  Symbol:
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  Color: [255, 170, 0, 255]
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• Value: sand
  Label: sand
  Description:
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• Value: fine to medium sand
  Label: fine to medium sand
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• Value: mud
  Label: mud
  Description:
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Transparency: 0
Labeling Info:

Advanced Query Capabilities:

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Type ID Field: Class

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: GIS Object ID, editable: false, nullable: false, defaultValue: null, modelName: OBJECTID )
• Class ( type: esriFieldTypeString, alias: Bottom Class, editable: true, nullable: true, length: 30, defaultValue: null, modelName: Class )
• sediments ( type: esriFieldTypeString, alias: Sediment Types, editable: true, nullable: true, length: 30, defaultValue: null, modelName: sediments )
• biotope ( type: esriFieldTypeString, alias: Biotope, editable: true, nullable: true, length: 30, defaultValue: null, modelName: biotope )
• bedforms ( type: esriFieldTypeString, alias: Bedforms, editable: true, nullable: true, length: 50, defaultValue: null, modelName: bedforms )
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ID: sand, gravel
Name: sand, gravel
Domains:
Templates:
• Name: sand, gravel
  Description:
  Prototype:
  bedforms: null
  comments: null
  Class: sand, gravel
  sediments: null
  biotope: null
  
  Drawing Tool: esriFeatureEditToolPolygon

---

ID: sand
Name: sand
Domains:
Templates:
• Name: sand
  Description:
  Prototype:
  bedforms: null
  comments: null
  Class: sand
  sediments: null
  biotope: null
  
  Drawing Tool: esriFeatureEditToolPolygon

---

ID: fine to medium sand
Name: fine to medium sand
Domains:
Templates:
• Name: fine to medium sand
  Description:
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  comments: null
  Class: fine to medium sand
  sediments: null
  biotope: null
  
  Drawing Tool: esriFeatureEditToolPolygon

---

ID: mud
Name: mud
Domains:
Templates:
• Name: mud
  Description:
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  comments: null
  Class: mud
  sediments: null
  biotope: null
  
  Drawing Tool: esriFeatureEditToolPolygon

---

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