U.S. Geological Survey, 2010, MOSAIC_05M.TIF: GeoTIFF image of acoustic backscatter collected by the U.S. Geological Survey within the Upper St. Clair River between Michigan and Ontario, Canada, 2008 (GeoTIFF).: Open-File Report 2010-1035, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.This is part of the following larger work.Online Links:
- <https://pubs.usgs.gov/of/2010/1035/gis_catalog/mosaic/mosaic_05m.zip>
- <https://pubs.usgs.gov/of/2010/1035/html/gis.html>
Denny, Jane F. , Foster, David S. , Worley, Charles R. , and Irwin, Barry J. , 2010, Geophysical data collected from the St. Clair River between Michigan and Ontario, Canada, 2008-016-FA: Open-File Report 2010-1035, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center.Online Links:
This is a Raster data set. It contains the following raster data types:
Planar coordinates are encoded using row and column
Abscissae (x-coordinates) are specified to the nearest 0.500000
Ordinates (y-coordinates) are specified to the nearest 0.500000
Planar coordinates are specified in meters
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.
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This acoustic backscatter mosaic will be used to identify bedforms and surficial sediment distribution within the Upper St. Clair River. The mosaic will be correlated to sediment samples of the river floor and bottom video and photographs in order to interpret the acoustic facies.
U.S. Geological Survey.
SWATHplus acquisition software (version 3.05.90) was used to digitally log the bathymetric data at a rate of 30 pings/second and 3,072 samples per swath (ping) in the SWATHplus SXR format. Data collection parameters are saved into a SWATHplus session file in SEA's SXS format. These files can be later used for data replay.
An Octopus F180R Attitude and Positioning system (see: <http://www.codaoctopus.com/motion/f180/index.asp>) recorded ship motion (heave, pitch, roll, and yaw). These data were transmitted via network connection to the SWATHplus data collection software. The Octopus F180R Inertial Measurement Unit (IMU) was mounted directly above the SWATHplus transducers, to minimize lever arm offsets that can lead to positioning errors. The F180R uses two L1 antennas for position and heading accuracy. The antennas are mounted on a rigid horizontal pole, 3 meters above the F180R IMU, with a horizontal separation of 1 meter and are offset from the IMU in a forward/aft configuration. The forward offset of the primary antenna from the IMU is 0.5 meters, with no port/starboard offset.
Eight sound-velocity profiles were acquired during survey operations at roughly 4-hr intervals using an Applied Microsystems SV Plus V2 Velocimeter (Applied Microsystems, 2008).
SwathEd (no version) (Beaudoin, 2002)
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Xsonar/Showimage (no version) (Danforth, 1997; Danforth and Others, 1991).
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
-Create Blank Map Sheet at 0.5 meter resolution, UTM meters, Zone 17N, WGS84 (make_blank -prime 255 -8bit mosaic) -Copy mosaic.blank to mosaic.mos mosaic.ran -Mosaic the individual sonar lines (mos2 -maxdist 10 -custom_weight MOS_weights mosaic *.slr) -Remove the 1024 byte header from the mosaic.mos file (dd if=mosaic.mos of=mosaic.raw bs=1024 skip =1) -Convert the raw mosaic file to TIFF using Adobe Photoshop (CS3 10.0.1) -A world file was generated for the TIFF image using the UNIX command vi -GeoTIFF Examine, v. 1.01 (www.mentorsoftwareinc.com) was used to convert the TIFF image to a GeoTIFF.
Adobe Photoshop CS3 was used to apply a linear stretch to the mosaic. The digital number range of the backscatter image is 10 - 234. No data values are represented by 255.
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Foster, David S. , and Denny, Jane F. , 2009, Quaternary Geologic Framework of the St. Clair River between Michigan and Ontario, Canada: Open-File Report 2009-1137, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.Online Links:
Beaudoin, Jonathan, 2002, Hitchhiker's Guide to Swathed...: University of New Brunswick Ocean Mapping Group, Fredericton, New Brunswick.Online Links:
Differential Global Positioning System (DGPS) navigation data were acquired with the forward, or primary, Octopus F180R Attitude and Positioning system DGPS antenna and transmitted via a network connection to the SWATHplus data collection software. The F180R Attitude and Positioning system uses 2 L1 antennas for position and heading and an Inertial Measurement Unit (IMU) for motion sensing. The F180R IMU is mounted on the rigid sidemount used to deploy the SWATHplus bathymetric system, and is located directly above the SWATHplus transducers. The F180R antennas are mounted on a rigid horizontal pole, 3 meters above the F180R IMU, offset in a forward/aft configuration (see 'source contribution' for a full description of the F180R). DGPS accuracy is 1 to 3 meters, depending on the distance from a US Coast Guard coastal repeater station (<http://www.navcen.uscg.gov/>).
Lines 1 - 65 were used to generate the final GeoTIFF mosaic, mosaic_05m.tif. Gaps present in this data are generally in shallow-water areas where the system was not tracking bottom, or poor quality sonar returns precluded use in the completed mosaic.
All acoustic backscatter data were collected during USGS cruise 08016 using a SWATHplus 234-kHz swath bathymetric system and an Octopus F180R Attitude and Positioning System. Quality control was conducted during processing of the data. Any spurious data or artifacts were removed or minimized.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
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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: | This WinZip file contains a TIFF image and associated world file of backscatter mosaic collected within the St. Clair River between Michigan and Ontario, Canada, 2008 in format WinZip (version 9.0) Size: 11,602 KB |
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Network links: |
htp://pubs.usgs.gov/of/2010/1035/gis_catalog/mosaic/mosaic_05m.zip |
This Zip file contains a GeoTIFF image and world file. To utilize these data the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image.
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov