U.S. Geological Survey
2016
GeoTIFF image of shaded-relief bathymetry of the sea floor offshore of Moriches Inlet, New York, in 1998 (3-m resolution, Mercator, WGS 84)
1.0
remote-sensing image
data release
DOI:10.5066/F7Z899GG
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://www.sciencebase.gov/catalog/file/get/56ccd3f9e4b0b1892d9e0760?name=morich_srelief3m.zip
https://doi.org/10.5066/F7Z899GG
Bradford Butman
William W. Danforth
John E. Hughes Clarke
Richard P. Signell
William C. Schwab
2016
Bathymetry and backscatter intensity of the sea floor south of Long Island, New York
1.0
data release
DOI:10.5066/F7Z899GG
Reston, VA
U.S. Geological Survey
https://doi.org/10.5066/F7Z899GG
https://www.sciencebase.gov/catalog/item/56a8e8a2e4b0b28f1184dc54
Surveys of the bathymetry and backscatter intensity of the sea floor south of Long Island, New York, were carried out in November 1998 using a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The purpose of the multibeam echosounder surveys was to explore the bathymetry and backscatter intensity of the sea floor in several areas off the southern coast of Long Island along the 20-meter isobath. Survey areas offshore of Fire Island Inlet, Moriches Inlet, Shinnecock Inlet, and southwest of Montauk Point were about 1 kilometer (km) wide and 10 km long. The area was mapped by the U.S. Geological Survey with support from the Canadian Hydrographic Service and the University of New Brunswick.
This data release makes the multibeam echosounder data from the 1998 survey of the sea floor offshore of Moriches Inlet, New York, available in digital form. The GeoTIFF image of shaded-relief bathymetry provides a visualization of the bathymetry that accentuates small features that cannot be effectively shown as contours alone. The shaded-relief image was created by vertically exaggerating the bathymetry 4 times and then artificially illuminating the relief by a light source positioned 45 degrees above the horizon from an azimuth of 60 degrees. The illumination from 60 degrees, approximately parallel to the survey lines, minimizes artifacts caused by small depth changes that may occur between lines.
Other data sets from this survey may be found in Butman and others (2016) (see larger work citation).
19981107
19981107
ground condition
None planned
-72.816667
-72.650004
40.753333
40.696671
USGS Metadata Identifier
USGS:56ccd3f9e4b0b1892d9e0760
none
shaded-relief bathymetry
GeoTIFF image
multibeam
3-m resolution
sea floor
sea floor mapping
Simrad EM1000
Canadian Coast Guard ship (CCGS) Frederick G. Creed
WHCMSC field activity 1998-015-FA
Woods Hole Coastal and Marine Science Center (WHCMSC)
Coastal and Marine Geology Program (CMGP)
U.S. Geological Survey (USGS)
Canadian Hydrographic Service
University of New Brunswick
ISO 19115 Topic Category
oceans
geoscientificInformation
imageryBaseMapsEarthCover
USGS Thesaurus
sea-floor characteristics
marine geophysics
computational methods
geospatial datasets
multibeam sonar
none
Moriches Inlet
Long Island
New York Bight
Middle Atlantic Bight
mid-Atlantic Bight
New York
North Atlantic Ocean
none
1998
None
These data are not to be used for navigation purposes.
U.S. Geological Survey
Bradford Butman
mailing and physical address
Woods Hole Coastal and Marine Science Center
384 Woods Hole Road
Woods Hole
MA
02543
USA
508-548-8700 x2212
bbutman@usgs.gov
morich_srelief3m_browse.jpg
Image of shaded-relief bathymetry of the sea floor offshore of Moriches Inlet, New York. File is located in the compressed zip file.
JPEG
Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095
Schwab, W.C.
Thieler, E.R.
Denny, J.F.
Danforth, W.W.
2000
Seafloor sediment distribution off southern Long Island, New York
Open-File Report
00-243
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/of/2000/of00-243/
All data were processed in the same manner. Some features in the multibeam data are artifacts of data collection and environmental conditions. They include small highs and lows and unnatural-looking features, and patterns oriented parallel or perpendicular to survey tracklines. The orientation of the tracklines is sometimes identified by parallel stripes in the image. During data acquisition, the electrically erasable programmable read only memory (EEPROM) within the transceiver that controls the beam launch angles was programmed with incorrect parameters for the outer ten beams on the port and starboard sides. This caused depth soundings to be deeper for these outer beams by approximately 0.1 m; these deeper soundings are not corrected. The Long Island surveys were assigned a block of line numbers beginning with 3000.
This grid contains all data collected in the 1998 multibeam survey offshore of Moriches Inlet. There are a few gaps in the grid due to incomplete coverage by the multibeam system. Other data sets collected offshore of Long Island, New York, on WHCMSC field activity 1998-015-FA may be found in Butman and others (2016) (see larger work citation).
These data were navigated with a Differential Global Positioning System (DGPS); they are accurate to +/- 3 meters, horizontally.
Canadian Hydrographic Service
William w. Danforth
John E. Hughes Clarke
Unpublished Material
raw multibeam data
disc
19981107
19981107
ground condition
none
The multibeam data were collected with a Simrad EM1000 multibeam echosounder mounted on the starboard pontoon of the Canadian Coast Guard ship Frederick G. Creed. The 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. The horizontal resolution of the beam on the sea floor is approximately 10 % of the water depth. Vertical resolution is approximately 1 % of the water depth. Data were collected along tracklines oriented approximately northeast-southwest, parallel to the local isobaths, and spaced about 100 m apart. The frequency of the sonar was 95 kHz. Sound velocity profiles were obtained and input into the Simrad processing system to correct for refraction. Navigation was by means of differential GPS. Operation of the Simrad EM1000 was carried out by hydrographers of the Canadian Hydrographic Service. The data were collected on Woods Hole Coastal and Marine Science Center field activity 1998-015-FA.
A suite of processing software (called SwathEd) (www.omg.unb.ca/~jhc/SwathEd.html), developed by the Ocean Mapping Group at the University of New Brunswick, Canada, was used to process and grid the multibeam bathymetric soundings and backscatter intensity data, and to produce images. The metadata for the bathymetry grid (see link in larger work citation) describes the processing steps applied to the navigation and bathymetric soundings. The following processing steps produced the shaded-relief image for the Moriches data set:
>
1. Create a 3-m grid of the bathymetric soundings for the Moriches site using the SwathEd routine weigh_grid.
>
Command line: weigh_grid -fresh_start -omg -tide -coeffs -mindep -2 -maxdep -800 -beam_mask -beam_weight -custom_weight EM1000_Weights -butter -power 2 -cutoff 6 -lambda 1.5 gridFile filename.merged
>
2. Create a shaded-relief image of the bathymetry using SwathEd routine addSUN (sun elevation of 45 degrees from 60, vertically exaggerating 4 times). The shaded relief file created from the grid is mapped into the same projection as the grid and carries over the projection information (custom Mercator projection, central meridian -75 degrees, latitude of true scale 40 degrees north) used to create the grid.
>
Command line: addSUN -elev 45 -azi 60 -vert_exag 4.0 gridFile.r4 filename.shade
>
3. Use a two-point linear contrast stretch (0-254; 255 is no data) to enhance the shaded-relief image:
>
Command line: stretchacres -low 150 -high 200 -in filename.shade -out filename_shade.stretch
>
Note: An error in the UNB processing software that incorrectly projected the multibeam observations onto a plane was discovered in 2003. These data were processed with corrected software.
2015
U.S. Geological Survey
William W. Danforth
mailing and physical address
Woods Hole Coastal and Marine Science Center
384 Woods Hole Road
Woods Hole
MA
02543
USA
508-548-8700 x2274
wdanforth@usgs.gov
Convert each contrast-stretched shaded-relief image from SwathEd format to a TIFF file using the netpbm utilities (http://netpbm.sourceforge.net/):
>
Command line: rawtopgm -headerskip 1024 image_width image_height filename_shade.stretch | pnmtoTIFF -none - > filename.tif
2015
U.S. Geological Survey
William W. Danforth
mailing and physical address
Woods Hole Coastal and Marine Science Center
384 Woods Hole Road
Woods Hole
MA
02543
USA
508-548-8700 x2274
wdanforth@usgs.gov
Create a TIFF world file (tfw) for the shaded relief TIFF image for use in ArcGIS. Copy bounding box and resolution information from the jview program output to the tfw file.
>
Command line: jview filename_shade.stretch
2015
U.S. Geological Survey
William W. Danforth
mailing and physical address
Woods Hole Coastal and Marine Science Center
384 Woods Hole Road
Woods Hole
MA
02543
USA
508-548-8700 x2274
wdanforth@usgs.gov
Create GeoTIFF image using the Define Projection Tool in Data Management Tools, Projections and Transformations in ArcToolbox 9.3. Custom projection is Mercator, central meridian of -75.0 degrees, latitude of true scale 40.0 degrees north, false easting 0.0, false northing 0.0; Geographic Coordinate System WGS 1984.
2016
U.S. Geological Survey
Bradford Butman
mailing and physical address
Woods Hole Coastal and Marine Science Center
384 Woods Hole Road
Woods Hole
MA
02543
USA
508-548-8700 x2212
bbutman@usgs.gov
USGS Thesaurus keywords added to the keyword section.
20180720
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20200810
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Raster
Pixel
2120
4744
1
Mercator
40.000000
-75.000000
0.000000
0.000000
row and column
3.000000
3.000000
meters
D_WGS_1984
WGS_1984
6378137.000000
298.257224
morich_srelief3m.tif
TIFF image of shaded relief multibeam bathymetry
USGS
The shaded-relief image (3-m resolution) was created by vertically exaggerating the topography four times and then artificially illuminating the relief by a light source positioned 45 degrees above the horizon from 60 degrees. In the resulting image, topographic features are enhanced by strong illumination on the eastward-facing slopes and by shadows cast on western slopes. The shaded-relief image accentuates small features that could not be effectively shown as contours alone at this scale. The illumination from 60 degrees, approximately parallel to the survey lines, helps minimize artifacts caused by small depth changes that may occur between lines. The image is an 8-bit grayscale (0-255); 255 is no data.
U.S. Geological Survey
U.S. Geological Survey - ScienceBase
mailing and physical address
Federal Center
Building 810
Mail Stop 302
Denver
CO
80225
1-888-275-8747
morich_srelief3m.zip: contains morich_srelief3m.tif, morich_srelief3m.tfw, and associated FGDC-compliant metadata (CSDGM format)
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.
GeoTIFF
ArcGIS 9.3
GeoTIFF image
GeoTIFF image of shaded-relief bathymetry and associated metadata from a multibeam survey offshore of Moriches Inlet, New York, compressed in a WinZip (version 14) file
zip
1.3
https://www.sciencebase.gov/catalog/file/get/56ccd3f9e4b0b1892d9e0760?name=morich_srelief3m.zip
https://doi.org/10.5066/F7Z899GG
The network resource directs to a landing page where the zip file containing the data can be downloaded.
none
The GeoTIFF image of shaded-relief bathymetry is compressed into a WinZip (version 14) file (morich_srelief3m.zip). To use these data, the user must have software capable of uncompressing the zip file and ArcGIS or another GIS application package capable of viewing the data.
20200810
U.S. Geological Survey
Bradford Butman
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2212
bbutman@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time