Eric E. Grossman
Peter Dartnell
David P. Finlayson
2018
High-resolution bathymetry data collected in 2007 in Skagit Bay, Washington
TIFF
data release
DOI:10.5066/F7JM27VN
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/F7JM27VN
https://www.sciencebase.gov/catalog/item/59bae032e4b091459a563d3d
Eric E. Grossman
Peter Dartnell
David P. Finlayson
2018
High-resolution bathymetry and acoustic-backscatter data collected in 2004, 2005, 2007, and 2010 in Skagit Bay, Washington
data release
DOI:10.5066/F7JM27VN
Pacific Coastal and Marine Science Center, Santa Cruz, CA
U.S. Geological Survey
https://doi.org/10.5066/F7JM27VN
https://www.sciencebase.gov/catalog/item/59b0579ae4b020cdf7d6e344
These metadata describe the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) 2007 bathymetry data collected in Skagit Bay Washington that is provided as a 1-m resolution TIFF image, as well as a 1-m resolution shaded-relief TIFF image. In 2004, 2005, 2007, and 2010 the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) collected bathymetry and acoustic backscatter data in Skagit Bay, Washington using an interferometric bathymetric sidescan sonar system mounded to the USGS R/V Parke Snavely and the USGS R/V Karluk. The research was conducted in coordination with the Swinomish Indian Tribal Community, Skagit River System Cooperative, Skagit Watershed Council, Puget Sound Nearshore Ecosystem Restoration Project, and U.S. Army Corps of Engineers to characterize estuarine habitats and processes, including the sediment budget of the Skagit River and the influence of river-delta channelization on sediment transport. Information quantifying the distribution of habitats and extent that sediment transport influences habitats and the morphology of the delta is useful for planning for salmon recovery, agricultural resilience, flood risk protection, and coastal change associated with sea-level rise.
These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify bathymetric features. These data are not intended to be used for navigation.
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=K104PS
https://cmgds.marine.usgs.gov/fan_info.php?fan=K205PS
https://cmgds.marine.usgs.gov/fan_info.php?fan=K107PS
https://cmgds.marine.usgs.gov/fan_info.php?fan=S410PS
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
2007
2007
ground condition at time data were collected.
As needed
-122.685
-122.465
48.466
48.302
USGS Metadata Identifier
USGS:59bae032e4b091459a563d3d
Global Change Master Directory (GCMD)
Bathymetry
Seafloor Topography
ISO 19115 Topic Category
geoscientificInformation
environment
imageryBaseMapsEarthCover
USGS Thesaurus
Bathymetry
sea-floor acoustic reflectivity
Geology
Data Categories for Marine Planning
Bathymetry and Elevation
Marine Realms Information Bank (MRIB) keywords
seabed
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Pacific Coastal and Marine Science Center
PCMSC
Geographic Names Information System (GNIS)
State of Washington
Puget Sound
Strait of Juan de Fuca
Skagit Bay
None
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originators of the dataset and in products derived from these data. This information is not intended for navigation purposes.
Peter Dartnell
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Physical Scientist
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-460-7415
831-427-4748
pdartnell@usgs.gov
https://www.sciencebase.gov/catalog/file/get/59bae032e4b091459a563d3d?name=SkagitBay_2007_QV.jpg&allowOpen=true
quick view image of 2007 Skagit Bay bathymetry data
JPEG
Caris HIPS and SIPS (ver. 9) and ArcMap (ver. 10.3.1) on a Windows 7 computer.
Not applicable for raster data.
No formal logical accuracy tests were conducted.
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Estimated to be no less than 1 m, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
Estimated to be no less than 0.5% water depth, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
In 2007 the USGS, PCMSC mapped a portion of Skagit Bay within Puget Sound, Washington. A 234-kHz interferometric bathymetric sidescan sonar system was pole-mounted to the USGS, PCMSC R/V Karluk. In 2017 the USGS, PCMSC downloaded the 2007 survey line files from the USGS archives. The survey line files were imported into Caris HIPS and SIPS software (version 9). Soundings were cleaned of obvious incorrect data and manual sound veolocity corrections were applied on some lines. The data were then gridded into a 1-m resolution base surface using the swath angle method. The base surface was exported as a TIFF file in UTM-10 coordinates referenced to the WGS84 ellipsoid. The TIFF file was imported into a Geographic Information System (ESRI, ArcMap) and converted to a grid, then converted to an ASCII XYZ file using Fledermaus software. The XYZ file coordinates and depths were transformed to NAD83 coordinates relative to NAVD88 depths using V-Datum software (version 3.7). The new XYZ file was gridded into a 1-m surface using Fledermaus software, exported as an ASCIIRaster file, imported into a GIS and then export as a TIFF file in UTM, zone 10 NAD83 coordinates relative to NAVD88. Also a shaded relief bathymetry grid was generated from the bathymetry data using the ESRI, ArcMap 'hillshade' tool. The grid was then exported as a TIFF file in UTM zone 10, NAD-83 coordinates. The image does not contain depth/elevation information.
2017
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
20201019
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
Grid Cell
17600
14407
1
Universal Transverse Mercator
10
0.9996
-123.00000
0.00000
500000.0
0.00
coordinate pair
1.0
1.0
Meters
NAD83
GRS80
6378137.00
298.257223563
North American Datum 1983
0.1
meters
Explicit elevation coordinate included with horizontal coordinates
value
depth in meters relative to NAVD88
Producer defined
The complete 1-m resolution 2007 Skagit Bay bathymetry grid was originally archived as a TIFF image with the following attributes.
>Cell size = 1.0
>Number of rows = 17600
>Number of columns = 14407
>
>Data type = floating point
>
>Boundary
>Xmin = 523522
>Xmax = 537929
>Ymin = 5350448
>Ymax = 5368048
>
>Statistics
>Minimum value = -77.36
>Maximum value = 0.00
>Mean = -16.56
>Standard deviation = 10.29
>
>Coordinate system description
>Projection UTM
>Zone 10
>Datum NAD83
>Vertical Reference NAVD88
>Units meter
U.S. Geological Survey
U.S. Geological Survey - ScienceBase
Mailing and Physical
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
1-888-275-8747
sciencebase@usgs.gov
These data are available in TIFF format (skagitbay_2007_bathmetry_1m_utm10_nad83_navd88.tif) contained in a single zip file (skagitbay_2007_bathymetry_1m_utm10_nad83_navd88.zip), which includes a tif world file (.tfw) and CSDGM FGDC-compliant metadata. A shaded-relief version (skagitbay_2007_shadedrelief_1m_utm10_nad83.tif) is contained in a second zip file (skagitbay_2007_shadedrelief_1m_utm10_nad83.zip), which also includes a tif world file (.tfw) and CSDGM FGDC-compliant metadata.
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
TIFF
ArcMap (version 10.3.1)
The .zip files contains the TIFF (.tif), the projection file (.tfw), and the XML (.xml) version of the metadata.
WinZip
27.7
https://www.sciencebase.gov/catalog/file/get/59bae032e4b091459a563d3d?name=skagitbay_2007_bathymetry_1m_utm10_nad83_navd88.zip
https://doi.org/10.5066/F7JM27VN
Data can be downloaded via the Internet
TIFF
ArcMap (version 10.3.1)
The .zip files contains the TIFF (.tif), the projection file (.tfw), and the XML (.xml) version of the metadata.
WinZip
13.3
https://www.sciencebase.gov/catalog/file/get/59bae032e4b091459a563d3d?name=skagitbay_2007_shadedrelief_1m_utm10_nad83.zip
https://doi.org/10.5066/F7JM27VN
Data can be downloaded via the Internet
None.
The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing a TIFF file.
20201019
Peter Dartnell
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Physical Scientist
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
United States of America
831-460-7415
pdartnell@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998