The sidescan sonar image of the shelf seafloor of the Monterey Bay area was mosaicked from data collected between 1995 and 1998 with three systems: Klein (towed), Simrad EM1000 (hull mounted), and EM300 (hull mounted). The resolution of the processed data ranged from 40 cm to 2.5 m. The data are presented here at a resolution of 2.5 m north of Monterey Canyon and 5 m south of Monterey Canyon. The sonar image is divided into 24 tiles that cover all or part of 7.5-minute map quandrangles. The polygon layer QUAD75 is an index for the 7.5-minute quadrangles.
This is one of a collection of digital files of a geographic information system of spatially referenced data related to the USGS Coastal and Marine Geology Program "Monterey Bay National Marine Sanctuary Project" <http://walrus.wr.usgs.gov/mbms>. The data were collected and analyzed between 1994 and 2000.
P.S. Chavez, Jr., Isbrecht, J., Gabel, G., Galanis, P., Ross, S., Anima, R., Eittreim, S., Maher, N., Sides, S.C., Soltesz, D.L., Velasco, M.G., and Wong, Florence L. , 2001, BSCATxx.TIF, QUAD75 - Sidescan sonar images and quadrangle index of the shelf seafloor in the Monterey Bay area from Point Ano Nuevo to Point Sur, California:.This is part of the following larger work.Online Links:
Wong, F.L., and Eittreim, S.E., 2001, Continental Shelf GIS for the Monterey Bay National Marine Sanctuary: U.S. Geological Survey Open-File Report 01-179, U.S. Geological Survey, Menlo Park, CA.Online Links:
This is a Raster data set. It contains the following raster data types:
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 2.5 or 5
Ordinates (y-coordinates) are specified to the nearest 2.5 or 5
Planar coordinates are specified in meters
The horizontal datum used is nad83.
The ellipsoid used is GRS1980.
The semi-major axis of the ellipsoid used is 6378137.0.
The flattening of the ellipsoid used is 1/298.257.
Sidescan sonar data are presented as TIFF images where the pixel value represents the backscatter intensity of the sonar signal.
Images BSCATxx.TIF for xx = 1 to 9, 10n, and 11n have 2.5-m pixel resolution with pixel values stretched and desampled from 1-m pixel Klein sidescan data collected during these surveys J2-95-MB, J6-95-MB, M2-95-MB, M1-96-MB, J3-97-MB, and J3-98-MB (<http://walrus.wr.usgs.gov/infobank>).
Images BSCATyy.TIF for yy = 10s, 11s, and 12 through 22 have 5-m pixel resolution with pixel values stretched from processed EM1000 (P1-95-MB) and EM300 (A4-98-MB) data (<http://walrus.wr.usgs.gov/infobank>).
IMAGE ROWS COLS FILESIZE (Mb) bscat01.tif 5281 4486 24 bscat02.tif 2443 2237 5 bscat03.tif 3995 2568 10 bscat04.tif 5585 4500 25 bscat05.tif 3944 4507 18 bscat06.tif 4531 4514 20 bscat07.tif 2884 1360 4 bscat08.tif 2406 2901 7 bscat09.tif 3285 4514 15 bscat10n.tif 3306 4522 15 bscat11n.tif 3506 2791 3 bscat10s.tif 1130 2260 10 bscat11s.tif 1105 1321 1 bscat12.tif 2795 565 2 bscat13.tif 2798 2264 6 bscat14.tif 2801 979 3 bscat15.tif 2795 565 2 bscat16.tif 2798 2267 6 bscat17.tif 269 363 1 bscat18.tif 2795 566 2 bscat19.tif 2798 1443 4 bscat20.tif 2795 1583 4 bscat21.tif 2797 1526 4 bscat22.tif 763 1506 1The image boundaries in UTM coordinates are
IMAGE XMIN YMIN XMAX YMAX
bscat01.tif 555519 4095055 566734 4108258
bscat02.tif 566623 4095136 572216 4101243
bscat03.tif 560422 4085148 566842 4095136
bscat04.tif 566733 4081268 577983 4095231
bscat05.tif 577855 4081363 589123 4091223
bscat06.tif 588977 4081472 600262 4092800
bscat07.tif 600100 4081596 603500 4088806
bscat08.tif 570857 4075349 578110 4081364
bscat09.tif 577983 4073261 589268 4081473
bscat10n.tif 589122 4073330 600427 4081595
bscat11n.tif 600263 4072970 607241 4081735
bscat10s.tif 589125 4067604 600425 4073254
bscat11s.tif 600265 4067729 606870 4073254
bscat12.tif 586590 4053629 589415 4067604
bscat13.tif 589270 4053739 600590 4067729
bscat14.tif 600425 4053864 605320 4067869
bscat15.tif 586730 4039764 589555 4053739
bscat16.tif 589415 4039874 600750 4053864
bscat17.tif 600590 4052659 602405 4054004
bscat18.tif 586870 4025899 589700 4039874
bscat19.tif 589555 4026009 596770 4039999
bscat20.tif 581930 4012034 589845 4026009
bscat21.tif 589700 4012144 597330 4026129
bscat22.tif 589845 4008449 597375 4012264
Polygon coverage QUAD75 consists of the outlines
for 7.5-minute quadrangles by which the backscatter images
are numbered. Its attributes are:
QUAD - quadrangle number 1 through 22
NAME - informal quadrangle names adapted from standard
7.5-minute topographic quadrangle names
1 Ano Nuevo
2 Davenport
3 Santa Cruz W2
4 Santa Cruz W1
5 Santa Cruz
6 Soquel
7 Watsonville W
8 Moss Landing W3
9 Moss Landing W2
10 Moss Landing W1
11 Moss Landing
12 Marina W2
13 Marina W1
14 Marina
15 Monterey W
16 Monterey
17 Seaside
18 Soberanes Point W
19 Soberanes Point
20 Point Sur W
21 Point Sur
22 Pfieffer Point W
Florence L. Wong
United States Geological Survey (USGS)
Geologist, GIS Coordinator
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA
(650) 329-5327 (voice)
(650) 329-5190 (FAX)
fwong@usgs.gov
These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information about the shallower areas of the Monterey Bay National Marine Sanctuary.
P.S. Chavez, Jr., Isbrecht, J., Gabel, G., Galanis, P., Ross, S., Anima, R., and Eittreim, S., 1998, Seafloor image map of the Monterey Bay region.Online Links:
Eittreim, S.L., Stevenson, A.J., and Maher, N., 1998, Seafloor sidescan sonar image files as 5-m grids.
Chavez, P.S., Jr., Isbrecht, J., Galanis, P., Gabel, G.L., Sides, S.C., Soltesz, D.L., Ross, S.L., and Velasco, M.G., 2001, Processing, mosaicking and management the Monterey Bay digital side-scan sonar images.: Marine Geology xx.
EM1000 sidescan data from inner shelf between Moss Landing and Monterey. Image (.BIL) files with 2.5-m pixels for north half and south half downloaded from CMG image processing group. Converted images to ArcInfo grids. Re-projected coordinates from Mercator projection to UTM. Combined north and south grids into one.
EM300 sidescan data south of Monterey Canyon and west of location of EM1000 data provided as 5-m ArcInfo grids by Norman Maher (MBARI).
Merged all grids of sonar image and subdivided them into 7.5-minute quadrangles. Cell size north of Monterey Canyon is 2.5 m; south of Monterey Canyon is 5 m. Converted grids to TIFF images.
Sidescan sonar images are discontinuous where survey tracklines were not run.
Not applicable for raster data.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.
This information is not intended for navigational purposes.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
United States Geological Survey (USGS)
c/o Florence L. Wong
Geologist, GIS Coordinator
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA
(650) 329-5327 (voice)
(650) 329-5190 (FAX)
fwong@usgs.gov
USGS Open-File Report 01-179
Please recognize the U.S. Geological Survey (USGS) as the source of this information.Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.
| Data format: | sidescan sonar images of the seafloor in format TIFF Size: 200 megabytes |
|---|---|
| Network links: |
<http://geopubs.wr.usgs.gov/open-file/of01-179> |
United States Geological Survey (USGS)
c/o Florence L. Wong
Geologist, GIS Coordinator
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA
(650) 329-5327 (voice)
(650) 329-5190 (FAX)
fwong@usgs.gov