harvey added some anchors:
lineage
constraints

Washington State Marine Bathymetry Mosaic

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Washington Department of Fish and Widlife
Publication_Date: 19990701
Title: Washington State Marine Bathymetry Mosaic
Publication_Information:
Publication_Place: Olympia, Washington, USA
Publisher: Washington Department of Fish & Wildlife
Description:
Abstract:
Bathymetry is the measurement of the depth of large bodies of water. Bathymetry data can be stored in a number of formats including point soundings, isobaths (contours), and grids. The bathymetry mosaic dataset is a grid coverage of water depth generated from point soundings. The grid structure is a regular array of cells referenced to the Universal Transverse Mercator (UTM) coordinate system. Each grid cell represents water depth for a discrete 20- x 20-meter area. The mosaic is a continuous grid covering Washington marine waters, Oregon waters as far south as Seaside, and the Columbia River upstream to Bonneville Dam. Canadian marine waters are included for southern Vancouver Island. The dataset was funded by the Puget Sound Ambient Monitoring Program (PSAMP). Primary bathymetry grid processing was performed under contract by Environmental Consultants (ECI), Portland, Oregon.
Purpose:
The bathymetry mosaic is best applied in medium scale applications (e.g., 1:100,000-scale). In regions of high depth sounding density, such as in some regions of Puget Sound, larger scale applications may be possible. The bathymetry mosaic can be readily combined with other spatial data in a Geographic Information Systems (GIS) for scientific study, environmental management, isobath generation, and cartographic display.
Supplemental_Information:
The bathymetry mosaic coastline is defined by highwater line. An additional boundary is defined by low slope areas exposed at low tide, such as mudflats; these areas were excluded from processing due to highly variable sounding availability and mapping consistency.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1800's
Ending_Date: Present
Currentness_Reference: 19990701
Status:
Progress: complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Description_of_Geographic_Extent:
Washington marine waters and Columbia River upstream to Bonneville Dam; Oregon marine waters to as far south as Seaside (46.0 degrees); Canadian waters around southern Vancouver Island. (Puget Sound, Strait of Georgia (limited), Strait of Juan de Fuca, Washington Outer Coast, and Columbia River)
Bounding_Coordinates:
West_Bounding_Coordinate: -126.78
East_Bounding_Coordinate: -121.38
North_Bounding_Coordinate: 49.52
South_Bounding_Coordinate: 45.6
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: bathymetry
Theme_Keyword: depth
Theme_Keyword: isobath
Access_Constraints: None
Use_Constraints:
1. The bathymetry dataset not to be used for navigational purposes. 2. Shoreline detail has been generalized due to grid cell processing. For projects needing fine-scale shoreline detail, it may be necessary to use point soundings and a vector shoreline, as well as additional low/high tide information, for generation of a bathymetry surface. 3. The grid cell depth values in intertidal areas in the bathymetry mosaic may be misleading. The input point soundings are referenced to Mean Lower Low Water (MLLW), and the shoreline represents the high waterline. Thus, sounding interpolation extends from MLLW to the high water line. For larger scale applications the data user may prefer to reconcile low and high tide depths with ancillary intertidal information. 4. Creation of the wide-area mosaic requires a uniform grid cell size. As such, there is a tradeoff between maintaining shoreline detail and interpolation of irregularly spaced soundings. The 20-meter cell size is overly optimistic for some areas given the highly variable depth sounding density observed in the project area. This is especially true for the heavily interpolated offshore region west of a line defined by the coordinates: (46.0, -125) (47.5,-125) (47.5,-125.5) (48.0,-125.5) (48.0,-126)(49,-126).
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Brian Cosentino
Contact_Organization: Washington Department of Fish and Wildlife
Contact_Position: Data Manager
Contact_Address:
Address_Type: mailing address
Address: 600 Capitol Way North
City: Olympia
State_or_Province: Washington
Postal_Code: 98501-1091
Country: USA
Contact_Voice_Telephone: 360-902-2376
Contact_Facsimile_Telephone: 360-902-2162
Contact_Electronic_Mail_Address: cosenblc@dfw.wa.gov.us
Hours_of_Service: 0800 - 1700 Monday through Friday
Native_Data_Set_Environment: UNIX-ARC/INFO

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy of the bathymetry mosaic is dependent upon an number of factors including density and distribution of depth sounding data, uncertain standards and requirements for soundings acquired before 1965, conversion of Canadian depth data to USA vertical datum, interpolation of sparse, irregularly spaced soundings into a regular grid, and multiple sources and compilation scales of shoreline information. The density and distribution of depth soundings is the most limiting constraint.
Logical_Consistency_Report:
The grid cell data structure is present and is fully operational in GIS environment. The range of depth values is valid. Map coordinate values are valid. Shoreline shape is modeled using a grid cell format. As such, shoreline detail is generalized from the original vector shoreline data.
Completeness_Report:
Most Washington marine waters are contained in the bathymetry mosaic. Data holes exist in Canadian waters in the Strait of Juan de Fuca and south/southwest of Barkley Sound. Limited coverage is provided for Lake Washington.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
A horizontal accuracy assessment was not performed. Note the Hydrographic Manual compiled by the National Ocean Survey for information concerning sounding data standards and requirements.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
A formal comparison between the bathymetry mosaic depth and an independent source of depth data was not performed. A qualitative assessment was performed using digital and hardcopy isobaths obtained from 1:100,000-scale sources, such as the USGS/NOS Bathymetric- Topographic series and the NOAA bathymetric Fishing Map series. The point-to-surface interpolation algorithm provided similar results as found in the 1:100,000-scale map series. Also note the Hydrographic Manual compiled by the National Ocean Survey for information concerning sounding data standards and requirements.
Lineage:
Methodology:
Methodology_Type: Step 1: Shoreline Preparation
Methodology_Identifier:
Methodology_Keyword_Thesaurus: None
Methodology_Description:
Step 1: Four sources of shoreline data were required for this project. The Washington DNR Aquatic Resources' "Water Level Line" provided the bulk of the shoreline. USGS 1:24,000- scale and 1:100,000-scale DLG data were incorporated for the Columbia River shoreline from Portland upriver to the Bonneville Dam. Canadian shoreline information was incorporated for Vancouver Island and the Strait of Georgia.
Methodology_Type: Step 2: Mudlfats/Sand Coverage Preparation
Methodology_Description:
Generation of a master mudflat/sand polygon coverage. This layer, combined with the master shoreline, formed the land/water position.
Methodology_Type: Step 3: Depth Soundings Preparation/Extraction
Methodology_Description:
Preparation of Canadian soundings and extraction of USA soundings from the NOS CD-ROM
Methodology_Type: Step 4: Bathymetry Tile Generation
Methodology_Description:
Fifty-five, 30- x 30-second tiles, generated from interpolated point sounding data, were delivered by the contractor. All interpolation was performed within the GDD reference system.
Methodology_Type: Step 5: Bathymetry Mosaic Generation
Methodology_Description: Generation of mosaic from 55 input tiles
Source_Information:
Source_Citation:
Citation_Information:
Originator: National Ocean Service (NOS)
Originator: Hydrographic Survery Data
Originator: U.S Coastal Waters
Originator: GEODAS CD-ROM Set
Originator: Version 3.3
Publication_Date: 1997
Title: USA Depth Soundings
Geospatial_Data_Presentation_Form: database
Publication_Information:
Publication_Place: Boulder, Colorado
Publisher: National Geophysical Data Center
Type_of_Source_Media: digital database file
Source_Time_Period_of_Content:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Canadian Hydrographic Service
Originator: Department of Fisheries and Oceans
Originator: Pacific Region
Title: Digital Field Sheet Soundings
Publication_Information:
Publication_Place: Sidney,British Columbia, Canada
Publisher: Canadian Hydrographic Service
Other_Citation_Details:
Digital Field Sheets: Chart datum: Lower Low Water Large Tide (LLWLT) fs1183L: Race Rocks to Discovery Island 1:25,000 fs1184L: Discovery Island to Morseby Island 1:25,000 fs1190L: William Head to Otter Point 1:20,000 fs1259S: Race Rocks 1:20,000
Type_of_Source_Media: digital file
Source_Time_Period_of_Content:
Source_Information:
Source_Citation:
Citation_Information:
Title: Enviromental Chart Depth Data
Publication_Information:
Publisher: Canadian Hydrographic Service
Type_of_Source_Media: digital file
Source_Time_Period_of_Content:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Natural Resources
Originator:
Aquatic Resources Division, Nearshore Habitat Program
Publication_Date: variable
Title: High waterline
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Olympia,Washington,USA
Publisher: Washington Department of Natural Resources
Other_Citation_Details:
"Water Level Line" interpreted from early 1990s digital orthophotography. The water level line compilation scale is 1:24,000. Ancillary digital data include National Wetlands Inventory (NWI) and WADNR Hydrography Framework. Ancillary paper sources include NOAA Navigation Charts and color aerial photographs acquired at low tide. Due to interpretation limitations, the elevation of the water level line may vary from Extreme High Water; therefore, the water line may represent Mean High Water or other elevation regimes in some areas. See WDNR Aquatic Resources' Database documentation for more details.
Source_Scale_Denominator: 24000
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Title: 1:24,000-scale DLG
Other_Citation_Details: http://edcwww.cr.usgs.gov
Source_Scale_Denominator: 24000
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Title: 1:100,000-scale Digital Line Graph
Other_Citation_Details: http://edcwww.cr.usgs.gov
Source_Scale_Denominator: 100000
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Source_Information:
Source_Citation:
Citation_Information:
Publication_Date: Unknown
Title: Vancouver Island shoreline
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Nanaimo, British Columbia,Canada
Publisher: Department of Fisheries and Oceans
Other_Citation_Details:
Higher High Water Large Tide (HHWLT) line extracted from scanned Canadian Hydrographic Service charts. Scan resolution equals 5 meters. Scanned line converted to vector DXF coverage. Source scale is 1:40,000 except in areas where 1:40,000 not available, then 1:80,000-scale chart data used.
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Source_Information:
Source_Citation:
Citation_Information:
Publication_Date: variable
Title: Washington State Hydrography Framework
Publication_Information:
Publication_Place: Olympia, Washington, USA
Publisher: Washington State Department of Natural Resources
Source_Scale_Denominator: 24000
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Source_Information:
Source_Citation:
Citation_Information:
Publication_Date: variable
Title: Washington State Hydrography Framework
Publication_Information:
Publication_Place: Olympia, Washington, USA
Publisher: Washington State Department of Natural Resources
Source_Scale_Denominator: 24000
Type_of_Source_Media: map
Source_Time_Period_of_Content:
Process_Step:
Process_Description:
Step 1: (1) A master shoreline coverage was generated by appending all shoreline coverages from state, federal, and Canadian sources into one coverage, referenced to UTM Zone 10. (2)A polygon coverage was generated from the master shoreline coverage through addition of new arcs. (3) The polygon coverage was projected to Geographic Decimal Degree (GDD). (4) The polygon shore coverage was exported to an ASCII format and provided to the contractor. (5) The contractor subsequently converted the polygon data into a grid.
Process_Date: 1998
Process_Step:
Process_Description:
Step 2: (1) A master mudflat/sand coverage was generated from Washington Department of Natural Resources' hydrogrpahy framework layer and undocumented Washington Department of Fish and Wildlife coverages. The coverages were joined to create a master mudflat/sand cover and projected from stateplane south to GDD. (2) The polygon coverage was exported to an ASCII format and provided to the contractor. (3) The contractor subsequently converted the polygon data into a grid.
Process_Date: 1998
Process_Step:
Process_Description:
Step 3: (1)Digital Canadian sounding point data were projected from UTM Zone 10, NAD83 to GDD NAD27. (2) The Canadian soundings were adjusted to USA vertical datum using linear regression on a per-area basis. Size of processing area for each regression run was 30- x 30- seconds. An ASCII output was generated of the adjusted soundings and provided to the contractor. (3) Soundings for USA waters were extracted by the contractor from the National Ocean Survey, Hydrographic Survey Data, CD-ROM Set, Version 3.3, 1997. (4) Canadian and USA soundings were combined prior to grid processing.
Process_Date: 1998
Process_Step:
Process_Description:
Step 4: (1) A combined gridded shoreline and mudflat/sand grid was generated. (2) Point soundings were extracted for each 30- x 30-second tile and interpolated to a regular grid structure. Adjacent tiles were edge matched. (3) The grid cell dimensions of nearshore tiles are .00021150592217 x .00021150592217 degrees. Offshore tiles (12 tiles) have grid cell dimensions of .00086805555556 x .00086805555556 degrees. (4) The contractor output each tile in bil image format. Pixel value output as two-byte integer
Process_Date: 1998
Process_Step:
Process_Description:
Step 5: (1) Each tile was imported from bil format to UNIX ARC/INFO/GRID version 7.2 using IMAGEGRID. (2) Processing limitations required each individual tile to be projected/resampled from GDD to UTM Zone 10 prior to mosaic generation. (3) All 55 tiles were combined into one mosaic with grid cell size equal to 20- x 20-meters with non-water areas converted to NODATA.
Process_Date: 1998

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 22377
Column_Count: 20633

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 10
Transverse_Mercator:
Longitude_of_Central_Meridian: -123
Latitude_of_Projection_Origin: 0
False_Easting: 500000
False_Northing: 0
Scale_Factor_at_Central_Meridian: .9996
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 20
Ordinate_Resolution: 20
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Mean lower low water
Depth_Resolution: .1
Depth_Distance_Units: meters
Depth_Encoding_Method: Attribute values

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: VALUE
Entity_Type_Definition: Depth scaled by a factor of 10.
Entity_Type_Definition_Source:
Output value from depth sounding to grid interpolation
Attribute:
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 27570
Entity_Type:
Entity_Type_Label: COUNT
Entity_Type_Definition: Number of grid cells
Entity_Type_Definition_Source: Computed
Attribute:
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Positive integer
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 1280274
Overview_Description:
Entity_and_Attribute_Overview:
The bathymetry mosaic is composed of grid cells representing depth. Cell values are organized in a regular grid. Grid cell values are scaled by a factor of ten. Therefore, DEPTH = GRID CELL VALUE / 10

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Lori Guggenmos
Contact_Organization: Washington Department of Fish and Wildlife
Contact_Position: Cartographer
Contact_Address:
Address_Type: mailing address
Address: 600 Capitol Way North
City: Olympia
State_or_Province: Washington
Postal_Code: 98501
Country: USA
Contact_Voice_Telephone: (360) 902-2543
Hours_of_Service: 8:00 a.m. to 4:00 p.m. Monday Through Friday
Resource_Description: Washington State Marine Bathymetry Mosaic
Distribution_Liability:
Although these data have been processed successfully on a computer system at the Washington Department of Fish & Wildlife, 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 strongly recommended that these data are directly acquired from a Washington Department of Fish & Wildlife server, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The Washington Department of Fish & Wildlife shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: 7.2
Digital_Transfer_Option:
Offline_Option:
Offline_Media: 8mm Cartridge Tape
Recording_Format: tar
Fees:
Contact WDFW to request a Fish and Wildlife Data Order Form and instruction sheet (or see http://www.wa.gov/wdfw/hab/release.htm for product list, order form and price list).

Metadata_Reference_Information:
Metadata_Date: 19991206
Metadata_Review_Date: 19991206
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Brian Cosentino
Contact_Organization: Washington Department of Fish and Wildlife
Contact_Position: Data Manager
Contact_Address:
Address_Type: mailing address
Address: 600 Capitol Way North
City: Olympia
State_or_Province: Washington
Postal_Code: 98501-1091
Country: USA
Contact_Voice_Telephone: 360-902-2376
Contact_Facsimile_Telephone: 360-902-2162
Contact_Electronic_Mail_Address: cosenblc@dfw.wa.gov.us
Hours_of_Service: 0800 - 1700 Monday through Friday
Metadata_Standard_Name:
NBS Content Standard for Nation Biological Information Infrastructure Metadata
Metadata_Standard_Version: June 8, 1994 (Version 1.0)
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: None

Generated by mp on Thu Dec 23 14:12:09 1999