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