P-1-95-MB P-2-95-MB M-1-95-MB J-2-95-MB J-6-95-MB M-2-95-MB M-1-96-MB J-6-96-MB J-7-96-MB J-1-97-MB J-3-97-MB M-4-97-MB J-3-98-MB M-1-98-MB A-4-98-MB
Related USGS work in the Monterey Bay National Marine Sanctuary are online at <http://walrus.wr.usgs.gov/mbms>.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology.
Eittreim, Stephen L. , Anima, Roberto J. , Stevenson, Andrew J. , and Wong, Florence L. , 20000915, Polygon coverage MBGEOLSE for Seafloor rocks and sediments of the continental shelf from Monterey Bay to Point Sur, California: USGS Miscellaneous Field Studies Map MF-2345, U.S. Geological Survey, Menlo Park, CA.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 3.224549805355
Ordinates (y-coordinates) are specified to the nearest 3.224549805355
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
>MBGEOLSE.PAT: polygon attribute table
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
1 AREA 8 18 F 5
9 PERIMETER 8 18 F 5
17 MBGEOLSE# 4 5 B -
21 MBGEOLSE-ID 4 5 B -
25 GRID-CODE 4 8 B -
29 TAG 2 4 B -
AREA, PERIMETER: of polygons in square meters, meters, respectively
MBGEOLSE#: unique internal control number
MBGEOLSE-ID: user-assigned sequence number
GRID-CODE: value keyed to lookup table MBGEOLSE.PLUT below
TAG: flag to label polygon during plotting
>MBGEOLSE.AAT: arc attribute table
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
1 FNODE# 4 5 B -
5 TNODE# 4 5 B -
9 LPOLY# 4 5 B -
13 RPOLY# 4 5 B -
17 LENGTH 8 18 F 5
25 MBGEOLSE# 4 5 B -
29 MBGEOLSE-ID 4 5 B -
33 LTYPE 15 15 C -
FNODE#, TNODE# starting, ending node of arc, respectively
LPOLY#, RPOLY# polygon to left, right, respectively, of arc
LENGTH length of arc in meters
MBGEOLSE#: unique internal control number
MBGEOLSE-ID: user-assigned sequence number
LTYPE: line type: contact, scratch, fault
>MBGEOLSE.PLUT: polygon symbol lookup table
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
1 GRID-CODE 4 8 B -
5 DESCRIPTION 35 25 C -
40 AGE 26 26 C -
66 PTYPE 5 5 C -
** REDEFINED ITEMS **
66 LABEL 5 5 C -
Record GRID-CODE DESCRIPTION AGE PTYPE
1 -9 nodata
2 1 Monterey Formation Miocene Tm
3 2 mud and fine sand Quaternary Qmud
4 3 coarse sands Quaternary Qsd
5 4 granitic rock Late Cretaceous Kgr
6 5 pipeline
7 8 relict gravels and sands Quaternary Qgv
8 9 Santa Cruz Mudstone late Miocene Tsc
9 10 Purisima Formation Pliocene and Miocene Tp
10 13 Aromas Sand Quaternary Qa
11 15 Rocks of Sur platform Tertiary and Cretaceous TKu
12 28 Vaqueros(?) Formation Miocene and late Oligocene Tv(?)
Bathymetric data from National Oceanic and Atmospheric Administration (NOAA) / National Ocean Service (NOS) multibeam swath soundings for depths greater than 100 m and from the NOS Hydrographic Data Base (NOAA, 1998) for shallower depths were gridded at 2-second intervals with GMT's (Wessel and Smith, 1998) surface algorithm and smoothed with Arcinfo (ESRI, 1998) filter methods. Contour lines were generated from the resulting 50-m grid. The grid of bathymetric data was merged with USGS 30-m DEMs to calculate the shaded relief image, which has a 2X vertical exaggeration.NOAA, 1998, NOS Hydrographic Survey Data, US Coastal Waters: Boulder, CO, World Data Center for Marine Geology & Geophysics, Data Announcement 98-MGG-03, CD-ROM Set, Version 4.0 <http://www.ngdc.noaa.gov/mgg/bathymetry/hydro.html>.
Wessel, P., and Smith, W. H. F., 1998, New, improved version of Generic Mapping Tools released: EOS Transactions of the American Geophysical Union, v. 79 (47), p. 579 <http://www.soest.hawaii.edu/gmt/>.
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
These data are intended for science researchers, students, policy makers, and the general public.
United States Geological Survey, Coastal and Marine Geology (CMG), Florence L. Wong, 20000915, Polygon coverage MBGEOLSE for Seafloor rocks and sediments of the continental shelf from Monterey Bay to Point Sur, California: USGS Miscellaneous Field Studies USGS MF-2345, U.S. Geological Survey, Menlo Park, CA.Online Links:
Identified as best available version.
The side-scan sonar mosaics on the shelf north of Monterey Canyon have a pixel resolution of 0.4 m for the inner shelf and 0.8 m for the outer shelf. Although this pixel resolution allows us to resolve relatively small features on the seafloor, the accuracy of pixel location is considerably poorer than this due to inaccuracies in navigating the fish towed behind the ship for the northern surveys. The southern-shelf data, which were collected with hull-mounted systems, were processed at pixel resolutions of 2.5 m for backscatter and 5 m for bathymetry. The estimated navigational accuracy in pixel location is 50 m for the northern shelf data and 10 m for the southern shelf data. See Eittreim and others (in press) for a fuller discussion of the navigational accuracy and acoustic systems.
Interpretation was done at the scale of 2.4 m per pixel. At an image resolution of 72 dpi, common to most video screens, this represents a scale of 1:6,800.
Regional data coverage is limited by location of the survey lines. On the northern shelf from the sheltered area around Santa Cruz northwest to Point Ano Nuevo, the innermost survey lines were run into water depths as shallow as 5 meters. However in most other areas, shallowest lines were at about the 10 meter isobath, leaving a significant data gap to the shoreline. Interior gaps in the interpreted coverage are due to missing sidescan data, whether from non-overlapping tracklines, instrument failure, or corrupted data files.
Polygon and chain-node topology present. Every polygon has a label and all polygons are closed. Every line has a label.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- Physical source materials are under controlled, on-site access.
If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at <http://walrus.wr.usgs.gov/docs/infobank/bear/programs/html/main/sample-dist-policy.html>.
- 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
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.
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