ORWA26_500UTM: Oregon/Washington 500 meter, 1926 Bathymetry Grid; UTM Projection

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. Where did the data come from?
  2. How were the data processed and modified?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

Title:

ORWA26_500UTM: Oregon/Washington 500 meter, 1926 Bathymetry Grid; UTM Projection

Abstract:

ORWA26_500UTM is a digital bathymetric surface grid of the seafloor off the coast of Washington and Oregon. Grid cell spacing is 500m and the projection is UTM Zone 10. The surface was produced by gridding National Ocean Service (NOS) Hydrographic Surveys collected between 1926 and 1974 (primarily 1926 to 1930). This work includes the most recent bathymetric data available on a regional scale over the inner to outer continental shelf off the coast of Washington and Oregon. The results represent the best available estimate of the seafloor morphology for the time period circa 1926.

Supplemental_Information:

The SWCES was initiated to examine coastal geology, processes, and natural hazards within the Columbia River littoral cell. The study is jointly directed by the U.S. Geological Survey Coastal and Marine Geology Program and the Washington State Department of Ecology Shorelands and Environmental Assistance Program, with active participation of local communities in Pacific and Grays Harbor counties. Related USGS work in the Southwest Washington Coastal Erosion Study can be found online at: <http://www.ecy.wa.gov/programs/sea/swce/>

The grid described here is part of a data release of sixteen similar bathymetric grids. These include: 1926 and 1926-1998 merged Oregon/Washington (ORWA) and Southwest Washington study area (SWWA) grids, each at 500m and 750m grid spacing, in UTM Zone 10 (meters) and Washington State Plane South Zone 5626 (meters) projections. The ORWA data set extends from Heceta Head, Oregon to Cape Johnson, Washington, from the shoreline to about 2000m water depth; the SWWA data set extends from Tillamook Head Oregon to Pt. Grenville WA, from the shore to approximately 700m water depth.

The data used to create this bathymetric grid were collected between 1926 and 1974. Most data were collected between 1926 and 1930. Refer to Gibbs and others, 2000 for details.

1. How should this data set be cited?

   Gibbs, Ann E., 2000, ORWA26_500UTM: Oregon/Washington 500 meter, 1926 Bathymetry Grid; UTM Projection: U.S. Geological Survey (USGS), Menlo Park, CA.

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -125.28174861

   East_Bounding_Coordinate: -123.88902482

   North_Bounding_Coordinate: 48.00457361

   South_Bounding_Coordinate: 44.00616385

3. What does it look like?

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 1926

   Ending_Date: 1974

   Currentness_Reference: ground condition

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: raster digital data

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 885 x 198, type Grid Cell

   2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: State Plane Coordinate System 1983

      State_Plane_Coordinate_System:

      SPCS_Zone_Identifier: 5626

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996

      Longitude_of_Central_Meridian: -123.

      Latitude_of_Projection_Origin: 0.0

      False_Easting: 0.000

      False_Northing: -500000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 500
      Ordinates (y-coordinates) are specified to the nearest 500
      Planar coordinates are specified in Meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
      

      Vertical_Coordinate_System_Definition:

      Depth_System_Definition:

      Depth_Datum_Name: Mean lower low water

      Depth_Resolution: 1.0

      Depth_Distance_Units: meters

      Depth_Encoding_Method:

      Explicit depth coordinate included with horizontal coordinates

7. How does the data set describe geographic features?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Gibbs, Ann E.

2. Who also contributed to the data set?

   This Program is jointly funded by the Washington State Department of Ecology and the US Geological Survey, Coastal & Marine Geology Program.

3. To whom should users address questions about the data?

   United States Geological Survey (USGS),
   c/o Ann E. Gibbs
   Geologist
   USGS, MailStop 999, 345 Middlefield Road
   Menlo Park, CA 94025-3561
   USA
   

   (650) 329-5060 (voice)
   (650) 329-5190 (FAX)
   agibbs@usgs.gov
   

This bathymetric surface grid is intended for use as an historical bathymetric base map for scientific research. It is not intended for navigational purposes. The grid was originally intended for use in wave modelling experiments as part of the Southwest Washington Coastal Erosion Study (SWCES), a cooperative study by the US Geological Survey and the Washington State Department of Ecology.

1. Where did the data come from?

   NOS_HSD (source 1 of 3)

   National Geophysical Data Center, 1998, National Ocean Service Hydrographic Survey Data: US Coastal Waters. CD-ROM Set, Version 4.0. Data announcement 98-MGG-03. World Data Center for Marine Geology & Geophysics, Boulder CO.

   Type_of_Source_Media: CD-ROM

   Source_Contribution: All pre-1998 hydrographic data were obtained from this source.

   ORWA26PTS_UTM (source 2 of 3)

   US Geological Survey, CMG, Unpublished material, Point coverage ORWA26PTS_UTM.

   Type_of_Source_Media: online

   Source_Contribution: Original NOS hydrographic data points used for gridding.

   SWWA26PTS_UTM (source 3 of 3)

   US Geological Survey, CMG, Unpublished material, Point coverage SWWA26PTS_UTM.

   Type_of_Source_Media: online

   Source_Contribution: Edited NOS hydrographic data used for gridding.

2. How were the data processed and modified?

   Date: 1999 (change 1 of 3)

   See Gibbs, A.E., 2000 for additional information

   Date: 1999 (change 2 of 3)

   NOS_HSD data projected from Lat/Long NAD27 to WASP South Zone 5626, edited of erroneous points, and converted to UTM10. See Gibbs and others, 2000 for additional information

   Date: 1999 (change 3 of 3)

   NOS_HSD data projected from Lat/Long NAD27 to WASP South Zone 5626, edited of erroneous points, and converted to UTM10. See Gibbs and others, 2000 for additional information

1. How well have the observations been checked?

   The data have been thoroughly analyzed for for gross inaccuracies. A discussion of errors and accuracies associated with the original data collection methodologies can be found in Gibbs and Gelfenbaum (1999).

2. How accurate are the geographic locations?

   Horizontal accuracies for NOS surveys vary by water depth and distance from shore (see Gibbs and Gelfenbaum, 1999).

3. How accurate are the heights or depths?

   Vertical accuracies for NOS surveys vary by water depth and distance from shore (see Gibbs and Gelfenbaum, 1999).

4. Where are the gaps in the data? What is missing?

   Gaps in the hydrographic survey point data exists west of Willapa Bay from approximately -124.034 to -124.363 degrees longitude and 46.573 to 46.738 degrees latitude and northwest of Tillamook Bay from approximately -123.834 to -124.120 longitude and 45.472 to 45.626 latitude. The remaining data are considered complete.

5. How consistent are the relationships among the observations, including topology?

   Only NOS sounding data with an original cartographic code of 711 are included. The data set was rigorously edited of obviously erroneous points.

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints:

Please recognize the U.S. Geological Survey (USGS) as the source of this information.

Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.

This information is not intended for navigational purposes.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Feel free to use the data but please cite this publication: Gibbs, A.E., Buijsman, M.C., and Sherwood, C.R., 2000, Non-navigational Gridded Bathymetry Data : The Washington-Oregon Coast, 1926-1998; A data release and description of methods. USGS Open-File-Report OF 00-448.

1. Who distributes the data set? (Distributor 1 of 1)

   United States Geological Survey (USGS),
   c/o Ann E. Gibbs
   Geologist
   USGS, MailStop 999, 345 Middlefield Road
   Menlo Park, CA 94025-3561
   USA
   

   (650) 329-5060 (voice)
   (650) 329-5190 (FAX)
   agibbs@usgs.gov
   

2. What's the catalog number I need to order this data set?

3. What legal disclaimers am I supposed to read?

   Please recognize the US Geological Survey and Southwest Washington Coastal Erosion Study as the source of this information

   Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.

   The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.

4. How can I download or order the data?

Dates:

Last modified: 18-Oct-2000

Metadata author:

United States Geological Survey (USGS),
c/o Ann E. Gibbs
Geologist
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA

(650) 329-5060 (voice)
(650) 329-5190 (FAX)
agibbs@usgs.gov

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)