Digital images of seafloor video

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: David C. Twichell
Publication_Date: 20000123
Title: Digital images of seafloor video
Publication_Information:
Publication_Place: Woods Hole, MA
Publisher: U.S. Geological Survey
Description:
Abstract:
Two 21-day field operations were conducted in 1997 and 1998 in the estuaries and on the inner continental shelf off the northern Oregon and southern Washington coast. These cruises aboard the R/V Corliss were run in order to generate reconnaissance maps of the seafloor geology and the shallow subsurface stratigraphy using sidescan-sonar and seismic-reflection mapping techniques. The 1998 cruise also collected sediment grab samples, bottom photographs, and video images to verify the sidescan-sonar imagery and to document the seafloor geology. The combination of these data with previously collected sediment sample data (Robert, 1974; Nittrouer, 1978; and Smith et. al., 1980) has been used to define the extent and lithology of shelf sediments associated with the Columbia River littoral cell. This work is one component of a larger project studying the erosion of the Washington Oregon coasts and is being coordinated by the U.S. Geological Survey and the Washington State Department of Ecology. The reasons for collecting these data are to provide a regional synthesis of the offshore geology for this project and to support a wide variety of management decisions and to provide a basis for further process-oriented investigations.
Purpose:
This is a collection of JPEG images generated by digitizing frames of video imagery taken of the seafloor. The video camera was mounted on the sediment grab sampler.
Supplemental_Information:
Roberts, R.W., 1974, Marine sedimentological data of the Washington continental shelf: University of Washington, Department of Oceanography Special Report 57, 129p.

Nittrouer, C.A., 1978, The process of detrital sediment accumulation in a continental shelf environment: an examination of the Washington shelf: PhD Thesis, University of Washington, Seattle, WA. 243p.

Smith, J.M., Messmer, L.W., Phipps, J.B., Samuelson, D.F., and Schermer, E.D., 1980, Grays Harbor and Chehalis River improvements to navigation environmental studies - Grays Harbor ocean disposal study: literature review and preliminary benthic sampling: U.S. Army Corps of Engineers Internal Report.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19980828
Beginning_Time: 14430000Z
Ending_Date: 19980916
Ending_Time: 18430000Z
Currentness_Reference: 1998
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.500000
East_Bounding_Coordinate: -123.800000
North_Bounding_Coordinate: +47.350000
South_Bounding_Coordinate: +45.900000
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: Corliss
Theme_Keyword: CRLS98014
Theme_Keyword: sediment sample
Theme_Keyword: grab sample
Theme_Keyword: image
Theme_Keyword: jpeg
Theme_Keyword: video
Theme_Keyword: framegrabber
Theme_Keyword: seafloor imagery
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: Pacific Ocean
Place_Keyword: Washington
Place_Keyword: Oregon
Place_Keyword: WA
Place_Keyword: OR
Place_Keyword: Inner shelf off Columbia River
Place_Keyword: Columbia River Littoral Cell
Access_Constraints: None
Use_Constraints:
The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David C. Twichell
Contact_Organization: U.S. Geological Survey
Contact_Position: Oceanographer
Contact_Address:
Address_Type: mailing and physical address
Address:
U.S. Geological Survey
Woods Hole Field Center
384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: dtwichell@usgs.gov
Data_Set_Credit: Seafloor Mapping Group
Data_Quality_Information:
Logical_Consistency_Report:
Each JPEG image is a digitization of seafloor bottom video. The quality of each image is dependant on bottom visibility at the time the video imagery was acquired.
Completeness_Report:
Video imagery was not acquired at every sample location. Various technical difficulties were encountered on the cruise which prevented the recording of video with every sample acquisition. In addition, not all sample stations had the seafloor visibility.    In these cases, no video was digitized.
Lineage:
Process_Step:
Process_Description:
The original seafloor video imagery was stored on 8mm video tapes. Post-cruise processing included using a video frame grabber to digitize imagery corresponding to sediment samples. The video camera was mounted on the sediment grab sampler and acquired continuous color video before, during, and after sediment sample collection. The images were digitized post-cruise into a color TIF image format and then converted to an 8-bit grayscale image. The grayscale images were not only much smaller, but actually showed better contrast when looking at seafloor morphology features. These images were also enhanced in an attempt to further accentuate the seafloor morphology features. To further descrease file size, these TIF images were then converted to JPEG format.
Process_Date: 19980000
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David C. Twichell
Contact_Organization: U.S. Geological Survey
Contact_Position: Oceanographer
Contact_Address:
Address_Type: mailing and physical address
Address:
U.S. Geological Survery
Woods Hole Field Center
384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: dtwichell@usgs.gov
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
These are JPEG images of digitized seafloor bottom video. Each image corresponds to a sediment sample location.  The image filename corresponds to the Samp-id attribute of the 'grabsamp' ArcView shapefile. Location of actual video imagery is in close proximity to the sediment sample location.
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: digitization of seafloor bottom video
Entity_Type_Definition: JPEG image
Entity_Type_Definition_Source: none
Attribute:
Attribute_Label: Filename
Attribute_Definition:
The image filename corresponds to a sediment sample. For example, 'sta71-1.jpg' refers to the digital seafloor image that corresponds to grab sample number 71. The -1 refers to the first image digitized, a -2 or higher number indicates subsequent digitized video images. In some cases, an image was saved in both grayscale and color. This is indicated by the presence of a "c" in the filename. For example, 'sta72-2c.jpg' is the second digitized video image, in color, that corresponds to sediment sample number 72.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Unrepresentable_Domain: character set
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Nancy Soderberg
Contact_Organization: U.S. Geological Survey
Contact_Position: Data Librarian
Contact_Address:
Address_Type: mailing and physical address
Address:
U.S. Geological Survey
Woods Hole Field Center
384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-457-2313
Contact_Electronic_Mail_Address: nsoderberg@usgs.gov
Resource_Description: U.S. Geological Survey CD-ROM Open-File Report
Distribution_Liability:
This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published on this CD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: JPEG
File_Decompression_Technique: JPEG image compression
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9600
Compatibility_Information: UNIX, DOS, MAC
Fees: none at this time
Metadata_Reference_Information:
Metadata_Date: 20000104
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address:
U.S. Geological Survey
Woods Hole Field Center
384 Woods Hole Rd
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: 19940608

Generated by mp on Tue Jan 25 14:49:29 2000