Foredune Ridges of the Columbia River Littoral Cell

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Portland State University, Department of Geology

Publication_Date: 20000517

Title: Foredune Ridges of the Columbia River Littoral Cell

Geospatial_Data_Presentation_Form: map

Publication_Information:

Publication_Place: Portland, OR USA

Publisher: Portland State University

Online_Linkage: nwdata.geol.pdx.edu

Description:

Abstract:

Foredunes are a series of parallel ridges with some difference in length and height. Recent work along the Columbia River cell as part of research project "USGS Southwest Washington Beach Erosion" has remapped using large- scale photography and topographic maps. The 3 foredune ridges represented in this data set are a composite of up to 17 actual duneridges that occur within the study area. Further work is under way to firmly identify individual ridges. The "ridges" in this data set do not represent any single ridge, they should be considered a fuzzy swath of ridges of similar age.

Purpose:

The purpose of this work is to establish the locations of foredune ridges occurring in the 4 sub-littoral cells of the Columbia River littoral cell.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20000517

Currentness_Reference: Publication Date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -124

East_Bounding_Coordinate: -123.9

North_Bounding_Coordinate: 46.22

South_Bounding_Coordinate: 45.95

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: dune

Theme_Keyword: earthquake

Theme_Keyword: west coast

Theme_Keyword: united states

Theme_Keyword: subduction

Access_Constraints: None

Use_Constraints: None

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: David Percy

Contact_Organization: Portland State University, Dept of Geology

Contact_Position: GIS Manager

Contact_Address:

Address_Type: mailing and physical address

Address:

Portland State University Department of Geology Room 17 Cramer Hall 1721 SW Broadway

City: Portland

State_or_Province: OR

Postal_Code: 97201

Country: USA

Contact_Voice_Telephone: 503-725-3373

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Attribute value of dunetype are accurate according to the model developed by Reckendorf, Peterson and Phipps.

Logical_Consistency_Report:

In terms of the model used, the attributes are logically consistent, ie older dunes are eastward of younger dunes.

Completeness_Report: Complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

RMS error during digitizing was in general approximately 30 meters for individual ridges. The ridge-composites in this data set are accurate to approximately 100 meters, with an approximate width ranging from 200 to 800 meters, averaging 500 meters. Thus, a 200-500m buffer could be used to represent these swaths.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: No vertical measurements are included.

Lineage:

Process_Step:

Process_Description:

6000 blue sheets from air photos, with extensive groundtruthing. Consequently the blue sheets were registed to geographic coordinates using street intersections referenced to 1995 TIGER line coverages. They were then digitized from these blue sheets.

Process_Date: 19990900

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Conformal Conic

Lambert_Conformal_Conic:

Standard_Parallel: 45.8333333333

Standard_Parallel: 47.3333333333

Longitude_of_Central_Meridian: -120.500000

Latitude_of_Projection_Origin: +45.333333

False_Easting: 500000

False_Northing: 0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 30

Ordinate_Resolution: 30

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Shape

Entity_Type_Definition: Polyline

Entity_Type_Definition_Source: Reckendorf, Peterson, Phipps

Metadata_Reference_Information:

Metadata_Date: 20000517

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: David Percy

Contact_Organization: Portland State University Department of Geology

Contact_Position: GIS Manager

Contact_Address:

Address_Type: mailing and physical address

Address:

Portland State University Department of Geology Room 17 Cramer Hall 1721 SW Broadway

City: Portland

State_or_Province: OR

Postal_Code: 97201

Country: USA

Contact_Voice_Telephone: 503-725-3373

Contact_Electronic_Mail_Address: percyd@pdx.edu

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998