U.S. Geological Survey, 2012, ei_2hm_shdrlf_image_dd.tif - interpolated swath bathymetry shaded relief image collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center surrounding the nearshore of the Elizabeth Islands, MA, 2010 (GeoTIFF): Open-File Report 2011-1184, 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:
Pendleton, Elizabeth A. , Twichell, David C. , Foster, David S. , Worley, Charles R. , Irwin, Barry J. , and Danforth, William W. , 2012, High-Resolution Geophysical Data From the Sea Floor Surrounding the Western Elizabeth Islands, Massachusetts: Open-File Report 2011-1184, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.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 0.000027. Longitudes are given to the nearest 0.000027. 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.
(508) 548-8700x2266 (voice)
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dtwichell@usgs.gov
This color-shaded relief image represents approximately 24.5 square km of bathymetric data that were collected in 2010. These data are used to define the sea-floor morphology surrounding the nearshore of the western Elizabeth Islands, Massachusetts.
U.S. Geological Survey.
Person who carried out this activity:
(508) 548-8700x2259 (voice)
(508) 457-2310 (FAX)
ependleton@usgs.gov
Person who carried out this activity:
(508) 548-8700x2259 (voice)
(508) 457-2310 (FAX)
ependleton@usgs.gov
Person who carried out this activity:
(508) 548-8700 x2259 (voice)
(508) 457-2310 (FAX)
ependleton@usgs.gov
Person who carried out this activity:
508-548-8700 x2259 (voice)
508-457-2310 (FAX)
ependleton@usgs.gov
Luis, J. F. , 2007, Mirone: A multi-purpose tool for exploring grid data.: Computers and Geosciences 33, Elsevier, Amsterdam.
Calder, B.R., 2003, Automatic Statistical Processing of Multibeam Echosounder Data: International Hydrographic Review Volume 4, INT HYDROGRAPHIC BUREAU, The Netherlands.
The navigation for these data was acquired with a Coda Octopus F180 Differential Global Positioning System + Wide Area Augmentation System (DGPS+WAAS); they are accurate to + or - 1 to 2 meters, horizontally. All DGPS data are referenced to WGS84, and the horizontal distance between the pole-mounted interferometric sonar transducers, 0.5m below the sea surface, and the DGPS antennae located on the same pole on the bow of the R/V Rafeal, 2.5 m above the sea surface, are corrected.
The theoretical vertical resolution of the SEA Ltd SwathPlus interferometric sonar is 1 % of water depth, approximately 0.03 to 0.25 m within the study area. An Octopus F180 Attitude and Positioning system was used to correct for vessel roll, pitch, heave, and yaw, which has a theoretical vertical accuracy of a few mm. Tidal offsets were corrected to MLLW using RTK GPS heights. Field tests using submerged targets suggest that the vertical accuracy of the RTK tidal correction is less than 30 cm. Gridding algorithms and cell sizes for these data could introduce errors as great as 3 m along the edges of the data. Gridding-induced errors are likely much smaller (< 0.2 m) for most of the study. Changes in ship draft due to water and fuel usage were not considered. Total vertical accuracy for these data are assumed to be + or - 50 cm.
All the bathymetric data from cruise 2010-003-FA were used to generate this GeoTIFF image, however, l13f1 and l22f1 were corrupted during acquisition, so these lines are not complete. The generator shorted out causing write errors in the raw swath file.
Any spurious data points were removed during processing.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- Not to be used for navigation. The 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.
(508) 548-8700x2259 (voice)
(508) 457-2310 (FAX)
ependleton@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: | This WinZip file contains a GeoTIFF image (and TIFF world file - tfw) of the bathymetry collected in the nearshore surround the Elizabeth Island MA, and the associated metadata. in format WinZip (version 14.5) Size: 6.75 MB |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2011/1184/GIS_catalog/bathy/ei_2hm_image_dd.zip> <https://pubs.usgs.gov/of/2011/1184/html/GIS_catalog.html> |
| Media you can order: |
DVD-ROM
(Density 4.75
Gbytes)
(format UDF)
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The image contained in the zip file is available as a GeoTIFF with a *.tfw (world file). To utilize this data, the user must have an image viewer, or an image processing or GIS software package capable of importing a TIFF image with a world file
508-548-8700 x2259 (voice)
(508)-457-2310 (FAX)
ependleton@usgs.gov
