COVERAGE CH57_95P

Available as - [Outline] - [SGML]

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: E&S Chemistry
Publication_Date: 19971027
Title: COVERAGE CH57_95P
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Corvallis,OR
Publisher: E&S Chemistry
Online_Linkage: <http://www.orst.edu/dept/tbaynep/active.html>
Description:
Abstract:
Change in Bathymetry of Tillamook Bay from 1957-1995. 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: 1. The breach of Bayocean Spit between 1952 and 1956 2. Deforestation in the watershed 3. The Tillamook Burns of 1933, 1939, 1945, and 1951 4. 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.

Purpose:
The major objective of this project was to attempt to quantify changes in the depth of Tillamook Bay during the intervening periods between the bathymetric sampling dates.
Supplemental_Information:
Much of this documentation was extracted from "BATHYMETRIC ANALYSIS OF TILLAMOOK BAY Comparison Among Bathymetric Databases Collected in 1867, 1957 and 1995"

by

Joseph A. Bernert and Timothy J. Sullivan see Tillbath.doc for more detail.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1957
Beginning_Time: Unknown
Ending_Date: 1995
Ending_Time: Unknown
Currentness_Reference: Publication Date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None Planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -123.94998217
East_Bounding_Coordinate: -123.875926
North_Bounding_Coordinate: 45.57012959
South_Bounding_Coordinate: 45.46867255
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: bathymetry
Theme_Keyword: Environmental information
Theme_Keyword: estuary
Theme_Keyword: Marine environments
Theme_Keyword: Sediment mobilization
Theme_Keyword: Sedimentary basins
Theme_Keyword: Soil erosion
Theme_Keyword: Surface waters
Theme_Keyword: Water erosion
Theme_Keyword: Watershed management
Theme_Keyword: wave erosion
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: North America
Place_Keyword: OR
Place_Keyword: Oregon
Place_Keyword: United States of America
Access_Constraints: none
Use_Constraints: see Distribution_Liability
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Joe Bernert or Tim Sullivan
Contact_Organization: E&S Chemistry
Contact_Address:
Address_Type: Mailing and Physical Address
Address: P.O. Box 609
City: Corvallis
State_or_Province: OR
Postal_Code: 97339
Country: USA
Contact_Voice_Telephone: (541) 758-6305
Contact_Electronic_Mail_Address: unknown
Native_Data_Set_Environment:
Windows_NT, 4.0, Intel ARC/INFO version 7.2.1
Cross_Reference:
Citation_Information:
Originator: E&S Chemistry
Publication_Date: 19971027
Title: COVERAGE CH67_95P
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Corvallis,OR
Publisher: E&S Chemistry
Online_Linkage: <http://www.orst.edu/dept/tbaynep/active.html>

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Value -6 in attribut GRID-CODE does not mean a change in depth of 6 feet, rather it means no change. This value is accurate but dangerously misleading.
Logical_Consistency_Report: Polygon topology present.
Completeness_Report: complete.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: see source metadata
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Measurement errors as documented in metadata for source coverages; in addition, there may exist a datum shift among the three bathymetric coverages. In other words, for each data set, the measured depths had to be standardized to some benchmark elevation. For example, a depth can be recorded at -3 ft., but we need to know the answer to the question, ?Three feet below what?? We do not have information on how the historical data sets were referenced, but we suspect that the reference points were probably not the same. Komar (1992) suggested that data on global sea level and local elevation changes indicated that, between 1931 and 1988, sea level has risen relative to the Tillamook area at a rate of 1 to 2 mm/yr. Assuming this rate has held since the first bathymetric survey, the rise in sea level in Tillamook Bay between 1867 and 1995 would be about 13 to 26 cm (0.4 to 0.8 ft). The official vertical datum shift of mean sea level was 4 ft between 1867 and 1957 and 3 ft between 1957 and 1995. Both of these vertical shifts in sea level were shifted upwards (Bruce Follansby, TBNEP, pers. comm.).

The inferred changes from 1957 to 1995- many more areas were inferred to have become deeper than to have become shallower. No datum shift is assumed because we do not know what shift to apply to standardize these data sets. see source metadata

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: E&S Chemistry
Publication_Date: 19971000
Publication_Time: Unknown
Title: GRID BATHGRID57
Geospatial_Data_Presentation_Form: ARC-INFO GRID
Publication_Information:
Publication_Place: Corvallis,OR
Publisher: E&S Chemistry
Online_Linkage: <http://www.orst.edu/dept/tbaynep/active.html>
Type_of_Source_Media: ARC_INFO GRID
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1957
Source_Currentness_Reference: SOURCE DATA
Source_Citation_Abbreviation: G
Source_Contribution: bathymetric surface from 1957
Source_Information:
Source_Citation:
Citation_Information:
Originator: E&S Chemistry
Publication_Date: 19971000
Title: GRID BATHGRID95
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Corvallis,OR
Publisher: E&S Chemistry
Online_Linkage: <http://www.orst.edu/dept/tbaynep/active.html>
Type_of_Source_Media: ARC_INFO GRID
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Source_Currentness_Reference: SOURCE DATA
Source_Citation_Abbreviation: H
Source_Contribution: bathymetric surface from 1995
Process_Step:
Process_Description:
GRID INTERPOLATION USING BATHGRID 57 AND BATHGRID 95 SEE SOURCE METADATA
Source_Used_Citation_Abbreviation: G
Process_Date: 19971000
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Joe Bernert or Tim Sullivan
Contact_Organization: E&S Chemistry
Contact_Address:
Address_Type: Mailing and Physical Address
Address: P.O. Box 609
City: Corvallis
State_or_Province: OR
Postal_Code: 97339
Country: USA
Contact_Voice_Telephone: (541) 758-6305
Contact_Electronic_Mail_Address: unknown

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 4286
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 8953
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 4287

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: 3.63000011444
Ordinate_Resolution: 3.63000011444
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: ch57_95p.PAT
Entity_Type_Definition:
-poly attribute table for changes in batyhmetry of Tillamook Bay,1957-1995
Entity_Type_Definition_Source: Sean Allen
Attribute:
Attribute_Label: GRID-CODE
Attribute_Definition:
'change in depth from 1957-1995, based on the difference in values of GRID BATHGRID_57 and GRID BATHGRID_95'
Attribute_Definition_Source: 'Sean Allen'
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -6
Enumerated_Domain_Value_Definition: no change
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: -5
Enumerated_Domain_Value_Definition: deeper by 5-6 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: -4
Enumerated_Domain_Value_Definition: deeper by 4-5 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: -3
Enumerated_Domain_Value_Definition: deeper by 3-4 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: -2
Enumerated_Domain_Value_Definition: deeper by 2-3 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: -1
Enumerated_Domain_Value_Definition: deeper by 1-2 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: deeper by 0-1 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: shallower by 0-1 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: deeper by 1-2 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: deeper by 2-3 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition: deeper by 3-4 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: deeper by 4-5 feet
Enumerated_Domain_Value_Definition_Source: 'A.M. Stark, Tillamook Bay National Estuary Project'
Overview_Description:
Entity_and_Attribute_Overview:

CH57_95P.PAT

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC
		1  AREA                   4    12     F      3
		5  PERIMETER              4    12     F      3
		9  CH57_95P#              4     5     B      -
	 13  CH57_95P-ID            4     5     B      -
	 17  GRID-CODE              4     8     B      -


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: 19990112
Metadata_Review_Date: 19990129
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

Generated by mp version 2.4.10 on Wed Jul 28 14:47:11 1999