Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports<http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html>. This spatial dataset is from the Cape Ann and Salisbury Beach Massachusetts project area. They were collected in two separate surveys in 2004 and 2005 and cover approximately 325 square kilometers of the inner continental shelf. High resolution bathymetry and backscatter intensity were collected in 2004 and 2005. Seismic profile data, sediment samples and bottom photography were also collected in 2005.
U.S. Geological Survey, 2008, KLEIN_BS1M_GEOG.tif - 1 meter Klein 3000 sidescan-sonar backscatter GeoTIFF mosaic of the nearshore portion of the Cape Ann to Salisbury Beach Massachusetts survey area.: Open-File Report 2007-1373, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.This is part of the following larger work.Online Links:
Barnhardt, Walter A. , Andrews, Brian D. , Ackerman, Seth D. , Baldwin, Wayne E. , and Hein, Christopher J. , 2008, High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts.: Open-File Report 2007-1373, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.Online Links:
This is a Raster data set. It contains the following raster data types:
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0000089892031. Longitudes are given to the nearest 0.0000089892031. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.
Sequential unique whole numbers that are automatically generated.
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | 255 |
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
The purpose of these data is to measure the relative backscatter reflectance from towed side-scan sonar in the survey area for regional geologic interpretations from Cape Ann to Salisbury Beach, Massachusetts.
The specific parameters used in Xsonar are listed below:
Demultiplexing Range and Filter Option: Swath Width= 200m Across Track/Along Track Filter= 4 x 3 pings Port and Starboard Normalize=4000 pings Input= 16 bit
Beam Patter Correction: Number of lines= 150 Ping Overlap=75 Max Beam Angle=90 Response Angle:55
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
dd if=filename.ras of=filename.ras bs=80 skip=1
These resulting rasters (.ras) were converted to a TIFF using Adobe Photoshop (ver. 10).
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Barnhardt, Walter A. , Andrews, Brian D. , and Butman, Bradford, 2006, High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts: Open-File Report 2005-1293, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Ackerman, Seth D. , Butman, Bradford, Barnhardt, Walter A. , Danforth, William W. , and Crocker, James M. , 2006, High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts: Open-File Report 2006-1008, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Danforth, William W. , 1997, Xsonar/ShowImage: A complete system for rapid sidescan-sonar processing and display.: Open-File Report 97-686, U.S. Geological Survey, Woods Hole Science Center, Woods Hole, MA.
Paskevich, V.F., 1996, MAPIT: An improved method for mapping digital sidescan sonar data using the Woods Hole Image Processing System (WHIPS) Software: Open-File Report 96-281, U.S. Geological Survey, Woods Hole Science Center, Woods Hole, MA.
Small differences in contrast stretch (DN values) exist because of variations in sea and weather conditions on each survey day.
These data were navigated using Real-Time Kinematic Global Positioning System (RTK-GPS) signal from a RTK base station established by USGS for this survey. RTK-GPS provides horizontal position accuracies (x and y) on the decimeter scale (<http://www.noaa.gov>; <http://www.nos.noaa.gov>; <http://www.ngs.noaa.gov>). The x,y, and z position of the sidescan-sonar towfish was calculated from estimated depth and layback from the GPS receiver on the survey vessel. The accuracy of the actual position of the sidescan-sonar towfish is dependant on this estimated layback. The accuracy of the horizontal position of the towfish is estimated at 10m.
The positional accuracy of the final georeferenced Klein backscatter mosaic was adjusted by registering the Klein mosaic to the backscatter collected with the SEA SwathPlus bathymetric sonar. The SwathPlus backscatter has better positional accuracy because the GPS antenna was mounted directly over the sonar head to minimize xy offsets between the acquired RTK-GPS position and SwathPlus sonar transducers.
Although both the 132 kHz and 445 kHz frequency data were collected, only the low frequency (132 kHz) data were processed and included in this mosaic. All lines surveyed were used in the final mosaic.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- The intended scale of these data is 1:25,000. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
508-548-8700 x2348 (voice)
bandrews@usgs.gov
Downloadable Data
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
| Data format: | WinZip file containing GeoTIFF of Klein 3000 backscatter imagery from the inshore portion of the Cape Ann to Salisbury Beach Massachusetts survey area. in format TIFF (version GeoTIFF) GeoTIFF Size: 66.6 Mb |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2007/1373/GIS/raster/backscatter/klein_bs1m_geog.zip> |
| Media you can order: |
DVD-ROM
(Density 4.75
Gbytes)
(format UDF)
|
These data in a tiled GeoTIFF format are distributed as a compressed WinZip file. The user must have software capable of uncompressing a WinZip (ver. 9.0) file and viewing a tiled GeoTIFF image file.
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov