COVERAGE BATHPT95

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator: Interrain Pacific

Publication_Date: 19950000

Title: COVERAGE BATHPT95

Geospatial_Data_Presentation_Form: ARC-INFO COVERAGE

Publication_Information:

Publication_Place: Portland,OR

Publisher: Interrain Pacific

Online_Linkage: <http://www.orst.edu/dept/tbaynep/active.html>

Description:

Abstract:

Bathymetry points from 1995 Army Corps of Engineers Survey. Bathymetric points for 1995 were collected by the U.S. Army Corps of Engineers in 1994 and 1995. The data were collected from 49,084 sample points in linear paths across the bay (Figure 1c). The transects were generally about 200 m apart with samples 30 m from one another. This represents a sampling intensity of 7.5 times the sampling frequency employed in 1957, and 13 times the frequency employed in 1867. These sampling differences have an important influence on the errors associated with preparation of the respective bathymetric maps.

Purpose:

navigation, comparison with other historical and more recent bathymetry data(see COVERAGES BATHPT95, BATHPT67,BATHPTS, BATHPOLY95, BATHPOLY67, BATHPOLY57, BATHGRID95, BATHGRID67, BATHGRID57) Several studies of sedimentation and sediment composition have been conducted in Tillamook Bay (e.g., Avolio 1973, Glenn 1978, Komar 1997). The latter report provides an overview of what is known about sedimentation of the bay, which is an important environmental concern because of its influence on habitat quality and navigation. Bathymetric surveys were conducted in 1867, 1957, and 1994/1995. E&S performed a comparative analysis for TBNEP of the available historical bathymetric data sets for the bay. The objective of this analysis was to quantify, to the extent possible, the changes in bathymetry that occurred between the times of the available surveys. It is considered likely that the bay has received excessive contributions of sediment since the last century. Major sources include: ? the breach of Bayocean Spit between 1952 and 1956

? deforestation in the watershed

? the Tillamook Burns of 1933, 1939, 1945, and 1951

? land use practices in the watershed, including road construction, agriculture, and urbanization

The greatest impacts of these sources of sedimentation probably occurred prior to the 1957 bathymetric survey. In addition, the bay has been altered in a variety of other ways that have undoubtedly affected its bathymetry. These include the drainage of wetlands and construction of dikes and levees. The inlet from the ocean was modified by constructing jetties, and dredging of navigation channels has occurred throughout this century (Percy et al. 1974). The most catastrophic change occurred in 1952 when the spit was breached just north of the current location of Cape Meares Lake. This may have been due to erosion of Bayocean spit in response to construction of the north jetty. The breach remained open until a dike was constructed in 1956 to close it off.

Supplemental_Information: Renamed from COVERAGE B95PTS

Time_Period_of_Content:

Currentness_Reference: Publication Date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None Planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -123.95059808

East_Bounding_Coordinate: -123.87480707

North_Bounding_Coordinate: 45.57014782

South_Bounding_Coordinate: 45.4550173

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: bathymetry

Theme_Keyword: Sedimentation

Theme_Keyword: Soil erosion

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: North America

Place_Keyword: OR

Place_Keyword: Oregon

Place_Keyword: Tillamook Bay

Place_Keyword: United States of America

Temporal:

Temporal_Keyword_Thesaurus: None

Temporal_Keyword: 1995

Temporal_Keyword: CURRENT

Access_Constraints: none

Use_Constraints: see Distribution_Liability

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: John Gabriel

Contact_Organization: Interrain Pacific

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 1200 NW Front Ave., Suite 470A

City: Portland

State_or_Province: OR

Postal_Code: 97209

Country: USA

Contact_Voice_Telephone: (503) 226-8108

Contact_Electronic_Mail_Address: interrain@igc.apc.org

Native_Data_Set_Environment:

Windows_NT, 4.0, Intel ARC/INFO version 7.2.1

Cross_Reference:

Citation_Information:

Originator: Interrain Pacific

Publication_Date: 19950000

Title: COVERAGE BATHPT57

Publication_Information:

Publication_Place: Portland,OR

Publisher: Interrain Pacific

Cross_Reference:

Citation_Information:

Originator: Interrain Pacific

Publication_Date: 19950000

Title: COVERAGE BATHPT67

Publication_Information:

Publication_Place: Portland,OR

Publisher: Interrain Pacific

Cross_Reference:

Citation_Information:

Originator: Interrain Pacific

Publication_Date: 19950000

Title: COVERAGE B50SPTS

Publication_Information:

Publication_Place: Portland,OR

Publisher: Interrain Pacific

Data_Quality_Information:

Logical_Consistency_Report: Point features present.

Completeness_Report: complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The variance associated with the 1995 bathymetric surface was good, in the range of 1 to 2 ft across most of the bay. This is partly a result of new data collection techniques that were not available in 1867 and 1957. The availability of linked global positioning systems (GPS) and SONAR systems that collect and store x, y, and z coordinates instantaneously in an on-board computer data base now permit the collection of tens of thousands of data points in a fraction of the time required for the earlier surveys. The variance in this data set could have been reduced further by collecting data points in a more regular pattern (equidistant squares or triangles) rather than along transects.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The variance associated with the 1995 bathymetric surface was good, in the range of 1 to 2 ft across most of the bay. This is partly a result of new data collection techniques that were not available in 1867 and 1957. The availability of linked global positioning systems (GPS) and SONAR systems that collect and store x, y, and z coordinates instantaneously in an on-board computer data base now permit the collection of tens of thousands of data points in a fraction of the time required for the earlier surveys. The variance in this data set could have been reduced further by collecting data points in a more regular pattern (equidistant squares or triangles) rather than along transects.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Steve Cheser, Bob Peak

Publication_Date: 1995

Title: unknown

Publication_Information:

Publication_Place: Portland, OR

Publisher: Army Corps of Engineers

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1995

Source_Currentness_Reference: Publication Date

Source_Citation_Abbreviation: B

Source_Contribution: all

Process_Step:

Process_Description:

Bathymetry points from 1995 Army Corps of Engineers Survey. tla242.pts data file of x,y,z coordinates were converted into a point file. The x and y were originally in State Plane North, and z represented # feet below mean sea level. This point coverage was projected into Lambert, and the Z given a negative sign. The points were later adjusted for mean low low by assigning the value for BATHGRID95 which was adjusted using a GRID of the difference for sea level and mean low low. (See Process Description for BATHGRID95.)

Process_Date: Unknown

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert_Conformal_Conic

Lambert_Conformal_Conic:

Standard_Parallel: 43

Standard_Parallel: 45.5

Longitude_of_Central_Meridian: -120.5

Latitude_of_Projection_Origin: 41.75

False_Easting: 400000

False_Northing: 0

Planar_Coordinate_Information:

Coordinate_Representation:

Abscissa_Resolution: 4.135085582733

Ordinate_Resolution: 4.135085582733

Planar_Distance_Units: 3.2808400000

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: GRS1980

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: BATHPT95.PAT

Entity_Type_Definition: -point attribute table

Entity_Type_Definition_Source: computer generated

Attribute:

Attribute_Label: ADJ-MLL

Attribute_Definition: 'depth in feet at lowest low tide to the bottom'

Attribute_Definition_Source: K.M.Busse

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -53.964

Range_Domain_Maximum: 7.23

Attribute:

Attribute_Label: DEPTH

Attribute_Definition:

'depth units in feet. Vertical datum referenced to sea level with tide accounted for'

Attribute_Definition_Source: K.M.Busse

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -96

Range_Domain_Maximum: 1

Attribute:

Attribute_Label: NEAR50

Attribute_Definition:

'O if nearest point in COVERAGE B50PTS is more than 20 meters away,1 if within 20 meters'

Attribute_Definition_Source: K.M.Busse

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: see Overview_Description

Enumerated_Domain_Value_Definition: see Overview_Description

Enumerated_Domain_Value_Definition_Source: see Overview_Description

Overview_Description:

Entity_and_Attribute_Overview:

BATHPT95.PAT

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC
		1  AREA                   4    12     F      3
		5  PERIMETER              4    12     F      3
		9  BATHPT95#                4     5     B      -
	 13  BATHPT95-ID              4     5     B      -
	 17  DEPTH                  8     8     F      2
	 25  NEAR50                 1     1     I      -
	 26  ADJ-MLL                4    12     F      3

Entity_and_Attribute_Detail_Citation: not available

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Tillamook Coastal Watershed Resource Center

Contact_Position: G.I.S. Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 6385 Tillamook Ave.

City: Bay City

State_or_Province: OR

Postal_Code: 97107

Country: USA

Contact_Voice_Telephone: (503)377-4000

Contact_Electronic_Mail_Address: requests@tcwrc.tbcc.cc.or.us

Contact_Instructions: Contact via email,mail,fax or telephone

Distribution_Liability:

no warranty expressed or implied is made regarding the accuracy 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. This disclaimer applies both to individual use of the data and aggregate use with other data. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The Tillamook Coastal Watershed Resource Center shall not be held liable for improper or incorrect use of the data described and/or contained herein.

Metadata_Reference_Information:

Metadata_Date: 19981212

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Tillamook Coastal Watershed Resource Center

Contact_Position: G.I.S. Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 6385 Tillamook Ave.

City: Bay City

State_or_Province: OR

Postal_Code: 97107

Country: USA

Contact_Voice_Telephone: (503)377-4000

Contact_Electronic_Mail_Address: requests@tcwrc.tbcc.cc.or.us

Contact_Instructions: Contact via email,mail,fax or telephone

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Access_Constraints: none

Metadata_Use_Constraints: none