Backscatter [Swath]-- Offshore of Monterey Map Area, California

Metadata Updated: November 12, 2020

This part of DS 781 presents 2-m-resolution SWATHPlus data for the acoustic-backscatter map of Offshore of Monterey map area, California. These metadata describe acoustic-backscatter data collected and processed by California State University, Monterey Bay (CSUMB), Seafloor Mapping Lab and processed into a map sheet by the U.S. Geological Survey. The raster data files are included in "Backscatter _SWATH_Monterey.zip," which is accessible from http://dx.doi.org/10.5066/F7F47M6T. This 2-m-resolution SWATHPlus acoustic backscatter map of Offshore of Monterey map area, California, was generated from backscatter data collected by CSUMB using 234-kHz and 468-kHz SEA SWATHplus bathymetric sidescan-sonar systems. Within the final imagery, brighter tones indicate higher backscatter intensity, and darker tones indicate lower backscatter intensity. The intensity represents a complex interaction between the acoustic pulse and the seafloor, as well as characteristics within the shallow subsurface, providing a general indication of seafloor texture and composition. Backscatter intensity depends on the acoustic source level; the frequency used to image the seafloor; the grazing angle; the composition and character of the seafloor, including grain size, water content, bulk density, and seafloor roughness; and some biological cover. Harder and rougher bottom types such as rocky outcrops or coarse sediment typically return stronger intensities (high backscatter, lighter tones), whereas softer bottom types such as fine sediment return weaker intensities (low backscatter, darker tones). Reference Cited: California State University, Monterey Bay Seafloor Mapping Laboratory Data Library, 2015. Available at http://seafloor.otterlabs.org/SFMLwebDATA.htm (last accessed February 2016)

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date April 26, 2018
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 2016 (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from DOI Open Data

Graphic Preview

Acoustic backscatter imagery of Offshore of Monterey map area.

Additional Metadata

Resource Type Dataset
Metadata Date April 26, 2018
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 2016 (publication)
Responsible Party U.S. Geological Survey, Pacific Coastal and Marine Science Center (Point of Contact)
Contact Email
Guid
Access Constraints Use Constraints: USGS-authored or produced data and information are in the public domain. Acknowledge the U.S. Geological Survey, California State University, Monterey Bay, Seafloor Mapping Lab, and Monterey Bay Aquarium Research Institute in products derived from these data. Share data products developed using these data with the U.S. Geological Survey. This information is not intended for navigational purposes. Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology., Access Constraints: None
Bbox East Long -121.78
Bbox North Lat 36.69
Bbox South Lat 36.53
Bbox West Long -122.06
Coupled Resource
Frequency Of Update asNeeded
Graphic Preview Description Acoustic backscatter imagery of Offshore of Monterey map area.
Graphic Preview File https://www.sciencebase.gov/catalog/file/get/56cf5fc5e4b015c306ed183c?f=__disk__e4%2F7b%2F17%2Fe47b179f064504d9ec46cf7f2414e72af8e37ef2&allowOpen=true
Graphic Preview Type JPEG
Licence These databases, identified as acoustic-backscatter maps of the Offshore of Monterey map area, California have been approved for release and publication by the U.S. Geological Survey (USGS). Although these databases have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. These data are not intended for navigational use.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2009-01-01
Temporal Extent End 2009-01-01

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