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Maryland Offshore Ocean Resources - Bottom Classification 2011 Coastal Zone Management Block 1 [Maryland]

DNR · 2011 Full Details

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Title
Maryland Offshore Ocean Resources - Bottom Classification 2011 Coastal Zone Management Block 1 [Maryland]
Description
QuesterTangent's SWATHVIEW seabed classification software was used 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. Funding to compile these datasets provided by BOEM under cooperative agreement number: M14AC00007. Data processing and compilation was executed by Maryland Geological Survey. The views expressed herein are those of the authors and do not necessarily reflect the views of the Bureau of Ocean Energy Management (BOEM) or any of its sub-agencies. This geodatabase was created to provide planners and managers access to data about aggregate resources off the coast of Maryland. This geodatabase should not be used for navigational purposes. REFS: Conkwright, R.D., Van Ryswick, S, Sylvia, E.R. 2014. Seafloor Survey of Nearshore Ocean City Maryland. Maryland Geological Survey. This is a MD iMAP hosted service. Find more information on https://imap.maryland.gov . Feature Service Link: https://mdgeodata.md.gov/imap/rest/services/Geoscientific/MD_OffshoreOceanResources/FeatureServer/3
Creator
DNR
Temporal Coverage
2011
Date Issued
2016-09-07
Rights
The Spatial Data, and the information therein, (collectively the "Data") is provided "as is" without warranty of any kind, either expressed, implied, or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted, nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct, indirect, incidental, consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data, nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.
Access Rights
Public
Format
ArcGIS FeatureLayer
Language
English
Date Added
August 10, 2025
Provenance Statement
The metadata for this resource was last retrieved from Maryland iMap on 2025-08-24.

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  • Citation
    DNR (2016). Maryland Offshore Ocean Resources - Bottom Classification 2011 Coastal Zone Management Block 1 [Maryland]. . https://data.imap.maryland.gov/datasets/maryland::maryland-offshore-ocean-resources-bottom-classification-2011-coastal-zone-management-block-1 (web service)
  • BTAA Geoportal Link

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