Acoustic-backscatter data for Santa Cruz Harbor, California collected during USGS field activity 2022-609-FA
1-m resolution acoustic-backscatter data were collected during a January 2022 SWATHPlus survey in and near the Santa Cruz harbor, California. Data were collected and processed by the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) with fieldwork activity number 2022-609-FA. The 1-m acoustic-backscatter data are provided as a GeoTIFF file.
Additional information about the field activity from which these data were derived is available online at:
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.
Dartnell, Peter, and Jaffe, Bruce E., 20230322, Acoustic-backscatter data for Santa Cruz Harbor, California collected during USGS field activity 2022-609-FA: data release DOI:10.5066/P9IY4ZEK, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.
Dartnell, Peter, and Jaffe, Bruce E., 2023, Bathymetry and acoustic backscatter data for Santa Cruz Harbor, California collected during USGS field activity 2022-609-FA: data release DOI:10.5066/P9IY4ZEK, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 1.0
Ordinates (y-coordinates) are specified to the nearest 1.0
Planar coordinates are specified in Meters
The horizontal datum used is North American Datum of 1983, 2011 realization (NAD83(2011)).
The ellipsoid used is GRS80.
The semi-major axis of the ellipsoid used is 6378137.00.
The flattening of the ellipsoid used is 1/298.257222101.
acoustic backscatter value
(Source: Producer defined)
The complete 1-m resolution image "SCharbor_1m_backscatter_NAD83.tif" was originally archived as a TIFF image with the following attributes.
Cell size = 1.0
Number of rows = 1907
Number of columns = 1646
Data type = floating point
Xmin = 587546
Xmax = 589192
Ymin = 4090475
Ymax = 4092382
Minimum value = 0
Maximum value = 65535
Mean = 22703.35
Standard deviation = 5260.18
Coordinate system description
On January 15, 2022, an underwater volcanic eruption near Tonga generated a Pacific Ocean wide tsunami that impacted the California coast including northern Monterey Bay and the Santa Cruz harbor. The USGS, PCMSC conducted a bathymetric survey shortly after the tsunami to document any seafloor features that may have been created by the tsunami. 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 to identify bathymetric features. These data are not intended to be used for navigation.
The Swath survey was conducted with a SWATHplus-M 234-kHz interferometric side-scan sonar system pole-mounted on the U.S. Geological Survey (USGS) R/V San Lorenzo. During the mapping mission, an Applanix POS-MV (Position and Orientation System for Marine Vessels) was used to position the vessel during data collection, and it also accounted for vessel motion such as heave, pitch, and roll. The POS-MV also recorded position and vessel motion parameters for later post-processing. Sound-velocity profiles were collected throughout the survey day with a Castaway sound velocimeter. Post-processed POS-MV Smoothed Best Estimate of Trajectory (SBET) files were merged with the survey line files using BathySwath software and then the line files were imported into SonarWiz software. Backscatter imagery was generated using SonarWiz processing techniques. The backscatter image was exported as an Erdas Imagine file in UTM-10, WGS-84 coordinates. The image was re-projected to UTM-10, NAD83 coordinates using "Project Raster" tool in ArcToolbox. The new backscatter was then exported as a geoTIFF file in UTM zone 10, NAD-83(2011) coordinates.
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 originators of the dataset and in products derived from these data. This information is not intended for navigation purposes.
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.
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 a GeoTIFF file.