Peter Dartnell
Rikk G. Kvitek
Eleyne L. Phillips
Guy R. Cochrane
2013
Backscatter A [CSUMB]--Offshore of Carpinteria, California
1.0
GeoTiff
Samuel Y. Johnson
Peter Dartnell
Guy R. Cochrane
Nadine E. Golden
Eleyne L. Phillips
Andrew C. Ritchie
Rikk G. Kvitek
H. Gary Greene
Charles A. Endris
Gordon G. Seitz
Ray W. Sliter
Mercedes D. Erdey
Florence L. Wong
Carlos I. Gutierrez
Lisa M. Krigsman
Amy E. Draut
Patrick E. Hart
Susan A. Cochran
2013
California State Waters Map Series--Offshore of Carpinteria, California
map
Scientific Investigations Map
SIM 3261
Reston, VA
U.S. Geological Survey
https://pubs.usgs.gov/sim/3261/
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 SIM 3261 presents data for part of the acoustic-backscatter map (see sheet 3, SIM 3261) of the Offshore of Carpinteria map area, California. The raster data file is included in "BackscatterA_CSUMB_OffshoreCarpinteria.zip," which is accessible from https://pubs.usgs.gov/ds/781/OffshoreCarpinteria/data_catalog_OffshoreCarpinteria.html.
The acoustic-backscatter map of the Offshore of Carpinteria 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). These metadata describe the acoustic-backscatter data collected by CSUMB and reprocessed by the USGS. See "BackscatterB_USGS_OffshoreCarpinteria_metadata.txt" metadata for a description of the acoustic-backscatter data collected by the USGS. The southeastern nearshore and shelf areas, as well as the western midshelf area, were mapped by CSUMB in the summer of 2007, using a 244-kHz Reson 8101 multibeam echosounder. Within the acoustic-backscatter 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.
2007
2007
ground condition
As needed
-119.63
-119.43
34.45
34.29
Global Change Master Directory (GCMD)
Oceans > Bathymetry/SeafloorTopography > Bathymetry
Oceans > Bathymetry/SeafloorTopography > Seafloor Topography
General
Marine Geology
Multibeam
Geology
Bathymetry
Backscatter
Intensity
Ocean Floor Topography
U.S. Geological Survey
USGS
Pacific Coastal and Marine Science Center
CSMP
ISO 19115 Topic Category
geoscientificinformation
imageryBaseMapsEarthCover
oceans
Geographic Names Information System (GNIS)
Carpinteria
Summerland
California
None
Please recognize the U.S. Geological Survey (USGS) and California State University, Monterey Bay, Seafloor Mapping Lab (CSUMB). USGS-authored or produced data and information are in the public domain. 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.
Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.
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.
Peter Dartnell
U.S. Geological Survey,
Pacific Coastal and Marine Science Center
Physical Scientist
mailing and physical address
400 Natural Bridges Dr.
Santa Cruz
CA
95060-5792
USA
(831) 460-7415
(831) 427-4709
pdartnell@usgs.gov
<BackscatterA(CSUMB)_OffshoreCarpinteria_forDataCatalog>
Acoustic backscatter imagery of offshore Carpinteria.
GIF Offshore Carpinteria
Not applicable for raster data.
Unspecified
Complete
Estimated to be no less than 2 m, owing to total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
Not applicable
CSUMB acoustic-backscatter data were collected in the summer of 2007, using a 244-kHz Reson 8101 multibeam echosounder. During the mapping mission, an Applanix position and motion compensation system (POS/MV) was used to accurately position the vessel during data collection, and it also accounted for vessel motion such as heave, pitch, and roll (position accuracy, +/-2 m; pitch, roll, and heading accuracy, +/-0.02 degrees; heave accuracy, +/-5 percent, or 5 cm). NavCom 2050 GPS receiver (CNAV) data were used to account for tidal-cycle fluctuations, and sound-velocity profiles were collected with an Applied Microsystems (AM) SVPlus sound velocimeter. Soundings were corrected for vessel motion using the Applanix POS/MV data, for variations in water-column sound velocity using the AM SVPlus data, and for variations in water height (tides) using vertical-position data from the CNAV receiver.
2007
Carrie Bretz
Seafloor Mapping Lab, California State University Monterey Bay
Projects Manager, GIS; Metadata Supervisor
mailing and physical address
100 Campus Center, Bldg 13
Seaside
CA
93955
USA
(831) 582-4197
carrie_bretz@csumb.edu
USGS received original Caris HIPS/SIPS projects from CSUMB for CSUMB survey blocks A-H. Backscatter data were postprocessed by the USGS using CARIS7.0/Geocoder software. Geobars were created for each survey line using the beam-averaging engine. Intensities were radiometrically corrected (including despeckling and angle-varying gain adjustments), and the position of each acoustic sample was geometrically corrected for slant range on a line-by-line basis. The contrast and brightness of some geobars were adjusted to better match the surrounding geobars. Individual geobars were mosaicked together at 2-m resolution using the auto-seam method. The mosaics were then exported from CARIS as georeferenced TIFF images, imported into a GIS, converted to GRIDS, and clipped to the Offshore of Carpinteria map boundary.
2009
Pete Dartnell
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Physical Scientist
mailing and physical address
400 Natural Bridges Dr.
Santa Cruz
CA
95060-5792
USA
(831) 460-7415
pdartnell@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 meters
298.257223563
The complete 2007 backscatter data were originally archived as an ESRI grid
with the following attributes:
>Cell size = 2.0
>Number of rows = 8960
>Number of columns = 8960
>
>Data type = floating point
>
>Boundary
>Xmin = 276680
>Xmax = 258760
>Ymin = 3797180
>Ymax = 3815100
>
>Statistics
>Minimum value = 0
>Maximum value = 253
>Mean = 112.57
>Standard deviation = 20.78
>
>Coordinate system description
>Projection UTM
>Zone 11
>Datum WGS84
>Units meter
none
20130514
20130514
Peter Dartnell
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Physical Scientist
mailing and physical address
400 Natural Bridges Dr.
Santa Cruz
CA
95060-5792
USA
(831) 460-7415
(831) 427-4709
pdartnell@usgs.gov
Content Standard for Digital Geospatial Metadata
("CSDGM version 2")
FGDC-STD-001-1998
universal time