Peter Dartnell
Eleyne L. Phillips
Andrew C. Ritchie
Rikk G. Kvitek
Samuel Y. Johnson
2012
Backscatter B [USGS]--Hueneme Canyon and Vicinity, California
1.0
GeoTiff
Data Series
DS 781
Reston, VA
U.S. Geological Survey
https://pubs.usgs.gov/ds/781/
https://pubs.usgs.gov/ds/781/HuenemeCanyon/data_catalog_HuenemeCanyon.html
https://pubs.usgs.gov/ds/781/HuenemeCanyon/data/BackscatterB_USGS_HuenemeCanyon.zip
Nadine E. Golden
2013
California State Waters Map Series Data Catalog
database
Data Series
DS 781
Reston, VA
U.S. Geological Survey
https://pubs.usgs.gov/ds/781/
This part of DS 781 presents data for part of the acoustic-backscatter map of the Hueneme Canyon and Vicinity map area, California. Backscatter data are provided as separate grids depending on mapping system or processing method. The raster data file is included in "BackscatterB_USGS_HuenemeCanyon.zip," which is accessible from https://pubs.usgs.gov/ds/781/HuenemeCanyon/data_catalog_HuenemeCanyon.html. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P., Cochrane, G.R., Golden, N.E., Phillips, E.L., Ritchie, A.C., Kvitek, R.G., Greene, H.G., Krigsman, L.M., Endris, C.A., Clahan, K.B., Sliter, R.W., Wong, F.L., Yoklavich, M.M., and Normark, W.R. (S.Y. Johnson, ed.), 2012, California State Waters Map Series--Hueneme Canyon and Vicinity, California: U.S. Geological Survey Scientific Investigations Map 3225, 41 p., 12 sheets, scale 1:24,000, https://pubs.usgs.gov/sim/3225/.
The acoustic-backscatter map of Hueneme Canyon and Vicinity map area, California, was generated from backscatter data collected by California State University, Monterey Bay, Seafloor Mapping Lab (CSUMB) and by the U.S. Geological Survey (USGS). This metadata file describes the acoustic-backscatter data collected by the USGS. See https://pubs.usgs.gov/ds/781/HuenemeCanyon/metadata/BackscatterA_CSUMB_HuenemeCanyon_metadata.txt for a description of the acoustic-backscatter data collected by CSUMB. The far northern part of the Hueneme Canyon and Vicinity, California map area was mapped by the USGS in 2006, using a 117-kHz SEA (AP) Ltd. SWATHplus-M phase-differencing sidescan sonar. This mapping mission collected acoustic-backscatter data from about the 10-m isobath to almost the 3-nautical-mile limit of California's State Waters. Within the acoustic-backscater 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 sediment type. 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).
These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software.
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=Z206SC
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
2006
2006
ground condition
As needed
-119.338007
-119.139569
34.223097
34.058099
Global Change Master Directory (GCMD)
Acoustic Reflectivity
Data Categories for Marine Planning
distributions
physical habitats and geomorphology
Marine Realms Information Bank (MRIB) keywords
seabed
multibeam echo sounder
USGS Thesaurus
sonar methods
image mosaics
interferometric sonar
marine geophysics
sea-floor characteristics
sea-floor acoustic reflectivity
maps and atlases
geospatial datasets
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Pacific Coastal and Marine Science Center
PCMSC
Coastal and Marine Ecological Classification Standard (CMECS)
Marine Nearshore Subtidal
Marine Offshore Subtidal
Transform Continental Margin
Continental/Island Shelf
Rock Substrate
Unconsolidated Mineral Substrate
ISO 19115 Topic Category
geoscientificinformation
imageryBaseMapsEarthCover
oceans
Geographic Names Information System (GNIS)
Hueneme Canyon
Ventura
Port of Hueneme
Oxnard
State of California
Pacific Ocean
Coastal and Marine Ecological Classification Standard (CMECS)
Southern California Ecoregion
Coastal and Marine Ecological Classification Standard (CMECS)
Substrate
None
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060-5792
US
831-427-4747
pcmsc_data@usgs.gov
https://pubs.usgs.gov/ds/781/HuenemeCanyon/images/BackscatterB_USGS_HuenemeCanyon.jpg
Acoustic backscatter imagery of Hueneme Canyon and Vicinity collected by USGS
JPEG
Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; Esri ArcCatalog 10.0
Samuel Y. Johnson
Peter Dartnell
Guy R. Cochrane
Nadine E. Golden
Eleyne L. Phillips
Andrew C. Ritchie
Rikk G. Kvitek
H. Gary Greeene
Lisa M. Krigsman
Charles A. Endris
Kevin B. Clahan
Ray W. Sliter
Florence L. Wong
Mary M. Yoklavich
William R. Normark
2012
California State Waters Map Series--Hueneme Canyon and Vicinity, California
pamphlet and map sheets
Scientific Investigations Map
3225
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/sim/3225/
Not applicable for raster data.
Unspecified
Complete
0.5 meters
Not applicable
USGS backscatter data were collected in 2006 using 117 kHz SEA (AP) Ltd. SWATHplus-M phase-differencing sidescan sonar aboard the USGS R/V Parke Snavely. The survey vessel was equipped with a CodaOctopus F180 attitude and position system. This system combines Real Time Kinematic (RTK) Global Positioning System (GPS) data (2-centimeter error ellipse) with inertial motion measurements so that high-precision position and attitude corrections are fed in real-time to the sonar acquisition equipment. Up to 10 pings per second are transmitted with each ping consisting of 2048 samples per side (port and starboard). The returned samples are projected to the seafloor using a ray-tracing algorithm working with the previously measured sound velocity profiles. A series of statistical filters are applied to the raw samples that discriminate the seafloor returns from other unintended targets in the water column. The raw 16-bit backscatter data recorded simultaneously with bathymetry by the SWATHplus was georeferenced and gain-normalized by the program SXPEGN, software written by the USGS to enhance the backscatter of the SWATHplus system. The program normalizes for time-varying signal loss and beam directivity differences. The resulting normalized amplitude values are rescaled to 16-bit, and gridded into a GeoJPEG image using GRID Processor Software supplied by SEA. The GeoJPEG was imported into a GRID using Esri GIS software and clipped to the Hueneme Canyon and vicinity, California, map boundary.
2011
Metadata was modified to bring up to current USGS PCMSC standards. Information for accompanying Scientific Investigations Report added to Abstract and Cross Reference sections. Point of Contact information was updated. USGS Thesaurus and keywords were added, and Process Steps were refined. Details about different Network Resource Name links was given in the Access Instructions section. Phone number for Metadata Contact was corrected. Minor typos were corrected. No data information was changed.
20180926
Susan A Cochran
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Geologist
mailing and physical address
2885 Mission Street
Santa Cruz
CA
95060-5792
USA
(831) 460-7545
scochran@usgs.gov
Raster
Grid Cell
Universal Transverse Mercator
11
0.9996
-117.00000
0.00000
500000.0
0.00
coordinate pair
2.0
2.0
Meters
WGS84
WGS84
6378137.00
298.257223563
The USGS Hueneme Canyon and Vicinity backscatter grid was originally archived as an Esri grid
with the following attributes:
>Cell size = 2.0
>Number of rows = 8958
>Number of columns = 8958
>
>Data type = floating point
>
>Boundary
>Xmin = 284625.00
>Xmax = 302541.00
>Ymin = 3771055.00
>Ymax = 3788971.00
>
>Statistics
>Minimum value = 0
>Maximum value = 254
>Mean = 140.45
>Standard deviation = 24.02
>
>Coordinate system description
>Projection UTM
>Zone 11
>Datum WGS84
>Units meter
none
U.S. Geological Survey
mailing and physical address
345 Middlefield Rd
Menlo Park
CA
94025-3561
USA
(650) 329-4309
The .zip file (BackscatterB_USGS_HuenemeCanyon.zip) includes the .tfw, .tif, .tif.aux.xml, and .tif.ovr, files, as well as FGDC-compliant metadata for the backscatter data collected by the USGS in the Hueneme Canyon and Vicinity region of California.
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by 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.
GeoTiff
ArcMap (version 10.0, Esri, 2011)
Raster data layer is registered TIFF image in the UTM Zone 10 coordinate system.
The .zip file for the TIFF image includes the image (.tif), the world registration file (.tfw), and FGDC-compliant metadata.
WinZip
0.7
https://pubs.usgs.gov/ds/781/HuenemeCanyon/data/BackscatterB_USGS_HuenemeCanyon.zip
https://pubs.usgs.gov/ds/781/HuenemeCanyon/data_catalog_HuenemeCanyon.html
https://pubs.usgs.gov/ds/781/
The first link will begin a direct download of the data. The second link is a landing page on which all of the downloadable data for a particular region are listed. The third link is a landing page for the entire data catalog.
none
The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an Esri ArcMap TIFF. Users should download the ArcGIS Project File, HuenemeCanyonGIS.mxd.zip, a compressed (with the "zip" command) version of the ArcMap document (.mxd) that has all the data layers loaded in the table of contents for "Hueneme Canyon and Vicinity" and has all the data symbolized as on the map sheets. Download and save this ArcGIS project file, including all data layers, to the directory the user has created for this GIS.
20180926
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060-5792
US
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998