COVERAGE BATHPT95

Available as - [Outline] - [SGML]

Metadata:


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

Generated by mp version 2.4.10 on Wed Jul 28 14:30:53 1999