GRID BATHGRID95

Available as - [Outline] - [SGML]

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: E&S Chemistry
Publication_Date: 19971000
Title: GRID BATHGRID95
Geospatial_Data_Presentation_Form: ARC-INFO GRID Publication_Information:
Publication_Information:
Publication_Place: Corvallis,OR
Publisher: E&S Chemistry
Online_Linkage: <http://www.orst.edu/dept/tbaynep/active.html>
Description:
Abstract:
Bathymetric surface grid derived from bathpt95. 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.
Purpose:
We developed bathymetric maps for each of the data sets in a consistent fashion. This allowed direct comparison between surveys to permit quantification of the changes that occurred in the depth of the bay during the intervening periods. . 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. FOR MORE DETAILED INFORMATION SEE TILLBATH.TXT
Supplemental_Information:
Renamed from GRID BATH95 FOR MORE DETAILED INFORMATION SEE TILLBATH.TXT
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Currentness_Reference: Publication Date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None Planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -123.96617808
East_Bounding_Coordinate: -123.85807418
North_Bounding_Coordinate: 45.57333557
South_Bounding_Coordinate: 45.45455321
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Environmental monitoring
Theme_Keyword: Freshwater ecosystems
Theme_Keyword: Sediment transport
Theme_Keyword: Sedimentation
Theme_Keyword: Surface waters
Theme_Keyword: Transportation
Theme_Keyword: Watershed management
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: 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: 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>
Cross_Reference:
Citation_Information:
Originator: E&S Chemistry
Publication_Date: 19971000
Title: GRID BATHGRID67
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:
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. The range (r) of the semivariogram for 1867 was 584 m, as compared with 271 m in 1957 and 481 m in 1995 .Other potential sources of error in the bathymetric maps include

Lineage:
Source_Information:
Source_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>
Type_of_Source_Media: ARC-INFO COVERAGE
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: a
Source_Contribution: bathymetry points

Process_Step:
Process_Description:
The bathymetric coverages were developed by interpolating surfaces from the survey data points. We chose to use ordinary kriging because it is well suited to irregularly spaced data, is custom fit with a geostatistical model, and allows for calculation of variance associated with the interpolation. It is a least squares prediction method that includes a spline interpolation (Jernigan, 1986), and it assumes that the spatial variability in a surface is statistically homogeneous throughout the data. Kriging calculates a weighted moving average equation which estimates the true value of a regionalized variable and site specific location (Deutsch and Journel 1992, Cressie 1991). In order to perform kriging, the spatial correlation structure of the data needs to be assessed. A variogram model provides the interpretation of the correlation structure of the data (Englund and Sparks 1988). This is determined by representing the correlation among sample points separated by specific distances (y(h)). The model was fitted interactively and graphical examination of the semivariogram assisted in determining a good model fit (Jernigan 1986). A Gaussian distribution was chosen to fit the model to the data. FOR MORE DETAILED INFORMATION SEE TILLBATH.TXT
Process_Date: Unknown
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: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 1409
Column_Count: 866

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: 30
Ordinate_Resolution: 30
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:
Overview_Description:
Entity_and_Attribute_Overview:
depth VALUE in feet
BATHGRID95.VAT

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC
		1  VALUE                  4    10     B      -
		5  COUNT                  4    10     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: 19981215
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 14:41:39 1999