COVERAGE BATHPT67

Available as - [Outline] - [SGML]

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Interrain Pacific
Publication_Date: 19950000
Title: COVERAGE BATHPT67
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Portland,OR
Publisher: Interrain Pacific
Online_Linkage: <http://www.orst.edu/dept/tbaynep/active.html>
Description:
Abstract:
1867 Bathymetry points from US Coast Survey Office (Army Corps of Engineer) A Xerox of this historical map (US 20,000, Tillamook Bay OR: Ben Pierce) was obtained from the Army Corps of Engineers which was photographically reproduced onto mylar and digitized. 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 Tillamook Burns of 1933, 1939, 1945, and 1951
4l and use practices in the watershed, including road
construction, agriculture, and urbanization

Purpose:
navigation, comparison with other historical and more recent bathymetry data(see COVERAGES BATHPT95, BATHPT67,BATHPTS, BATHPOLY95, BATHPOLY67, BATHPOLY57, BATHGRID95, BATHGRID67, BATHGRID57)
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 18670000
Currentness_Reference: Publication Date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None Planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -123.98599425
East_Bounding_Coordinate: -123.85916531
North_Bounding_Coordinate: 45.5877096
South_Bounding_Coordinate: 45.46324088
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Sedimentation
Theme_Keyword: Soil erosion
Theme_Keyword: bathymetry
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: North America
Place_Keyword: United States of America
Place_Keyword: OR
Place_Keyword: Oregon
Place_Keyword: Tillamook Bay
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 1867
Temporal_Keyword: historical
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 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:
Bathymetric points collected in the 1867 survey were obtained from the U.S. Coast Survey Office. Data were derived from a paper map prepared by the U.S. Army Corps of Engineers. The coverage has 3750 points situated in an irregular network distributed throughout the bay and spaced approximately 200 to 300 m apart (Figure 1a). We noted that the x and y positional accuracy of the 1867 coverage appeared to have a shift when the outline of the bay was compared with the current bay outline (Figure 2). This was corrected using an affine coordinate transformation on twenty points located at locations presumed to be relatively stable on the shoreline of the bay. This transformation accounted for variability in scale, skewness, rotation and translation. The Root Mean Square Error of the transformation was 152 meters. The RMS error indicates how well the transformation matched the bay outline for all 20 data points across both data sets. It is a least square solution for the entire coverage. Several of the selected control points (i.e., Crab Harbor and one near McCoys Cove) may not have been as stable as we would like for this transformation. Excluding these points would only reduce the RMS error slightly. The transformed data set was used in the subsequent comparative analyses. The 1867 coverage also illustrated many landscape features which were not present in the 1957 and 1995 coverages due to revetment and other changes to the bay shoreline. Cape Meares Lake, Garibaldi, McCoys Cove, Larson Cove and the Jetty changed in the time period between 1867 and the more recent surveys due to construction activities and the spit breach. These areas were digitized and a new bay boundary coverage was prepared.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: important sources of variance are measurement errors, including the ability to standardize measurements to the
tidal fluctuations. The latter were undoubtedly much larger
in the earlier surveys.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.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Steve Cheser, Bob Peak
Publication_Date: unknown
Title: unknown
Publication_Information:
Publication_Place: Portland, Or
Publisher: U.S. Coast Survey Office, Army Corps of Engineers
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 18670000
Source_Currentness_Reference: Publication Date
Source_Citation_Abbreviation: A
Source_Contribution: ALL
Process_Step:
Process_Description:
A Xerox of this historical map (US Coastal Survey, 20,000, Tillamook Bay OR: Ben Pierce) was obtained from the Army Corps of Engineers which was photographically reproduced onto mylar and digitized. The map contained both sounding and lines which represented low water marks. These low water marks were converted into points and appended to the sounding points.
Process_Date: Unknown

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 3750

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: 400000.00000
False_Northing: 0.00000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 4.414585784489
Ordinate_Resolution: 4.414585784489
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: BATHPT67.PAT
Entity_Type_Definition: -point attribute table
Entity_Type_Definition_Source: computer generated
Attribute:
Attribute_Label: ELEV
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
Overview_Description:
Entity_and_Attribute_Overview:

BATHPT67.PAT

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC
    1  AREA                   8    18     F      5
    9  PERIMETER              8    18     F      5
   17  BATHPT67#               4     5     B      -
   21  BATHPT67-ID             4     5     B      -
   25  ELEV                   8     8     F      2


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_Person: Ann Stark
Contact_Position: GIS 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_Facsimile_Telephone: (503)377-4010
Contact_Electronic_Mail_Address: requests@tcwrc.tbcc.cc.or.us
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 14:43:14 1999