U.S. Geological Survey
2006
CAPENORTH_GEO4M_XYZ.TXT: ASCII formatted file of the 4-m bathymetry from the northern half of USGS survey 98015 of the Sea Floor off Eastern Cape Cod (Geographic)
1.0
Open-File Report
2005-1048
Woods Hole Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
http://pubs.usgs.gov/of/2005/1048/data/bathymetry/grid/capenorth_geo4m_xyz.zip
http://pubs.usgs.gov/of/2005/1048/data/bathymetry/grid/capenorth_geo4m_xyz.txt
http://pubs.usgs.gov/of/2005/1048/htmldocs/data_catalog.htm
L.J. Poppe
V.F. Paskevich
B. Butman
S.D. Ackerman
W.W. Danforth
D.S. Foster
D.S. Blackwood
2006
Geological Interpretation of Bathymetric and Backscatter Imagery of the Sea Floor off Eastern Cape Cod, Massachusetts
1.0
Open-File Report
2005-1048
Woods Hole Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
http://pubs.usgs.gov/of/2005/1048/
capenorth_geo4m_xyz.txthttp://pubs.usgs.gov/of/2005/1048/data/bathymetry/grid/
This data set includes bathymetry of the sea floor offshore of eastern Cape Cod, Massachusetts. The data were collected with a multibeam sea floor mapping system during USGS survey 98015, conducted November 9 - 25, 1998. The surveys were conducted using a Simrad EM 1000 multibeam echosounder mounted aboard the Canadian Coast Guard vessel Frederick G. Creed. This multibeam system utilizes 60 electronically aimed receive beams spaced at intervals of 2.5 degrees that insonify a strip of sea floor up to 7.5 times the water depth (swath width of 100 to 200 m within the survey area). The horizontal resolution of the beam on the sea floor is approximately 10% of the water depth. Vertical resolution is approximately 1 percent of the water depth.
To release the ASCII file containing the 4-m bathymetry generated from USGS survey 98015 off eastern Cape Cod.
en
19981109
19981125
ground condition
None planned
-70.307809
-69.828308
42.116649
41.966641
General
U.S. Geological Survey
USGS
Woods Hole Science Center
multibeam bathymetry
bathymetry
seafloor elevation
ASCII formatted file
Coastal and Marine Geology Program
CMGP
WHSC
Simrad EM1000
Field Activity Number 98015
General
Cape Cod
Massachusetts
Cape Cod National Seashore Park
U.S. East Coast
United States
North America
Atlantic Ocean
oceans and estuariesoceans and coastalIS0 19115 Topic Categoryelevation
None
Data are not to be used for navigation purposes.
Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
U.S. Geological Survey
Lawrence Poppe
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2314
(508) 457-2310
lpoppe@usgs.gov
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535
L.J. Poppe
D.S. Foster
W.W. Danforth
2006
Character and distribution of exposed glaciodeltaic deposits off outer Cape Cod, Massachusetts, and their effects on hydrogeology and benthic habitats
1.0
Geo-Marine Letters
v. 26
Germany
Springer
Filtered file
All collected data were processed and used to produce this dataset.
Navigation was by differential GPS
DVD-ROM
19981109
19981125
ground condition
The original multibeam bathymetric data acquired with a Simrad EM 1000 echosounder during USGS cruise 98015 aboard the Canadian Coast Guard vessel Frederick G. Creed
98015_multibeam_data
(1) Data and acquisition processing at sea:
After the echo sounder data were logged onto the hard disk of the Sun workstation, a suite of processing software developed by the Ocean Mapping Group (www.omg.unb.ca/~jhc/SwathEd.html) was used to correct for artifacts and errors that may have been introduced during data collection. This software also enhanced the corrected data by resolving beam pattern and aspect ratio distortions and by imposing a linear contrast stretch before it generated bathymetric and sidescan sonar image mosaicks in a Mercator projection. All data processing described here is initiated using Silicon Graphics workstations as soon as each acquisition file is closed by the Simrad Mermaid workstation (usually at the end of each survey line). Additional processing was done in the lab to correct for fluctuations in sea level during the survey and for artifacts in the data files that were not corrected in the field (see below).
(2) The processing and editing steps on board the ship were:
(A.) Demultiplex, or unravel, the acquired Simrad data files using RT to generate separate files containing navigation, depth soundings, sidescan sonar backscatter values, and sound velocity information.
(B.) Automatically reject bad data (autoRejectSoundings). For the multibeam soundings, reject data outside expected depth ranges (operator's decision based on nautical chart data); for navigation data, reject fixes with poor GPS statistics.
(C.) Edit the navigation data on-screen using jview to remove undesirable points, including turns at the ends of survey lines.
(D.) Edit the multibeam soundings on-screen using swathed to remove individual anomalous soundings.
(E). Merge tidal information and the corrected navigation back (mergetide and mergenav) into the data files. Tidal information was obtained from predicted tides using the Xtide program http://www.flaterco.com/xtide/xtide.html), which generated predicted tides based on the harmonic coefficients for Chatham provided by the Xtide program.
(F.) Map the bathymetric soundings from each processed data file onto a Mercator grid using weigh_grid (a SwathEd utility) with node spacings and scale selected by the operator. The grid file (capenorth.r4) was a floating point binary file.
Unknown
capenorth.r4
William Danforth
U.S. Geological Survey
Geologist
mailing address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2274
(508) 457-2310
bdanforth@usgs.gov
98015_multibeam_data
The SwathEd-created grid was converted into an ASCII xyz (decimal degrees and depths in negative meters) text file using a SwathEd utility (r4toASCII).capenorth.r4capenorth_geo4m_xyz.txt
Point
0.000001
0.000001
Decimal degrees
North American Datum of 1983
Geodetic Reference System 80
6378137.000000298.257222
GCS_North_American_1983
Mean lower low watermetersExplicit depth coordinate included with horizontal coordinates
A comma delimited ASCII data file containing the northern half of the 4-m bathymetry from USGS survey 98015.Three comma separated values (CSV) per record. Value one is the latitude coordinate in decimal degrees of the ship coordinate; value 2 is the longitude coordinate in decimal degrees of the ship's coordinate; value three is the acquired depth value. The depth value is recorded in meter as a negative value
U.S. Geological Survey
Larry Poppe
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2314
(508) 457-2310
lpoppe@usgs.gov
Downloadable Data
Although this data set has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. 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.
ASCII
The ASCII bathymetry (capenorth_geo4m_xyz.txt) and associated metadata.
zip archive
http://pubs.usgs.gov/of/2005/1048/data/bathymetry/grid/capenorth_geo4m_xyz.zip
http://pubs.usgs.gov/of/2005/1048/data/bathymetry/grid/capenorth_geo4m_xyz.txt
http://pubs.usgs.gov/of/2005/1048/htmldocs/data_catalog.htm
http://pubs.usgs.gov/of/2005/1048/data/bathymetry/grid/capenorth_geo4m_xyz.txt
Data are downloadable via the World Wide Web (WWW).
DVD-ROM
4.75
Gbytes
UDF
None
The user must have a program capable of reading and processing ASCII formated XYZ data files.
2005
20060212
Larry Poppe
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2314
(508) 457-2310
lpoppe@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
None
enhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722capenorth_geo4m_xyz.txtISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002Filtered file2006032310073900200603231007390020060323