Grid Representing the Present Day Surface off the Coast of Washington and Oregon

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: David C. Twichell

Originator: VeeAnn A. Cross

Publication_Date: 20010716

Title:

Grid Representing the Present Day Surface off the Coast of Washington and Oregon

Geospatial_Data_Presentation_Form: raster digital data

Publication_Information:

Publication_Place: Woods Hole, MA

Publisher: U.S. Geological Survey

Larger_Work_Citation:

Citation_Information:

Originator: David C. Twichell

Originator: VeeAnn A. Cross

Publication_Date: 20011000

Title:

Holocene Evolution of the Southern Washington and Northern Oregon Shelf and Coast: Geologic Discussion and GIS Data Release

Series_Information:

Series_Name: U.S. Geological Survey Open-File Report

Issue_Identification: Report 01-076

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 and Oregon coast and is being coordinated by the U.S. Geological Survey and the Washington State Department of Ecology. The reason for collecting these data is to provide a regional synthesis of the offshore geology to support a wide variety of management decisions and to provide a basis for further process-oriented investigations.

Purpose:

This GIS overlap is a component of the Southwest Washington Coastal Erosion ArcView GIS database. This grid coverage represents the surface at present day as compiled from offshore seismic data and onshore DEM data.

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:

Single_Date/Time:

Calendar_Date: 20010716

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -124.869822

East_Bounding_Coordinate: -123.756691

North_Bounding_Coordinate: 47.348984

South_Bounding_Coordinate: 45.925996

Keywords:

Theme:

Theme_Keyword_Thesaurus: general

Theme_Keyword: raster

Theme_Keyword: grid

Theme_Keyword: present day

Theme_Keyword: surface

Theme_Keyword: seismic-reflection

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

Place_Keyword: Willapa Bay

Place_Keyword: Columbia River

Place_Keyword: Washington continental shelf

Place_Keyword: Washington coastal zone

Place_Keyword: Grays Harbor

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: USGS

Contact_Position: Oceanographer

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543

Country: USA

Contact_Voice_Telephone: 508-548-8700

Contact_Facsimile_Telephone: 508-457-2310

Contact_Electronic_Mail_Address: dtwichell@usgs.gov

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 1; ESRI ArcCatalog 8.1.1.649

Data_Quality_Information:

Logical_Consistency_Report: Consistent.

Completeness_Report: This data is complete for this particular study.

Lineage:

Process_Step:

Process_Description:

Seismic-reflection data was recorded digitally. This digital data was then loaded into the Landmark software package. Within Landmark, the interpretation were completed and then exported as an ascii X,Y,Z file. This interpreted seismic data was then combined with other data sources from the barriers, bays, and offshore into a single X,Y,Z ascii file. This ascii file was then imported into Dynamic Graphics, Inc. EarthVision software package. These scattered ascii points were then gridded at a 200m cell size. This grid was then filtered and exported as an ascii file. This new ascii file was then reformatted to an Arc/Info ascii grid format and imported into Arc/Info. A much more detailed description of all the processing steps is contained in the USGS Open-file report 01-076 "Holocene Evolution of the Southern Washington and Northern Oregon Shelf and Coast: Geologic Discussion and GIS Data Release" by David C. Twichell and VeeAnn A. Cross.

Process_Date: 20010301

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 784

Column_Count: 413

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 10

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -123.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 200.000000

Ordinate_Resolution: 200.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: Mean lower low water

Depth_Resolution: 1

Depth_Distance_Units: meters

Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: David C. Twichell

Contact_Organization: USGS

Contact_Position: Oceanographer

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543

Country: USA

Contact_Voice_Telephone: 508-548-8700

Contact_Facsimile_Telephone: 508-457-2310

Contact_Electronic_Mail_Address: dtwichell@usgs.gov

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 constitude or imply its endorsement, recommendation, or favoring by the United States Governemnt 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: ARCG

Transfer_Size: 1.558

Digital_Transfer_Option:

Offline_Option:

Offline_Media: CD-ROM

Recording_Capacity:

Recording_Density: 650

Recording_Density_Units: MBytes

Recording_Format: ISO9660 with Rock Ridge Extensions

Compatibility_Information: UNIX, PC, MAC

Fees: none at this time

Technical_Prerequisites: Capable of reading ESRI grid format.

Metadata_Reference_Information:

Metadata_Date: 20010810

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: VeeAnn A. Cross

Contact_Organization: USGS

Contact_Position: Marine Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543

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: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: URL: http://www.esri.com/metadata/esriprof80.html

Profile_Name: ESRI Metadata Profile