JPEG Images of the Floor of the John Day Reservoir - Acquired in 2000

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. From what previous works were the data drawn?
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• 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?
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Title:

JPEG Images of the Floor of the John Day Reservoir - Acquired in 2000

Abstract:

A two-week field operation was conducted in the John Day Reservoir on the Columbia River to image the floor of the pool, to measure the distribution and thickness of post-impoundment sediment, and to verify these geophysical data with video photography and bottom sediment samples. The field program was a cooperative effort between the USGS Coastal and Marine Geology Team of the Geologic Division and the USGS Columbia River Research Laboratory of the Biological Resources Division. The data collection was completed aboard the R/V ESTERO during September 13-27, 2000. The interest in sediment accumulation in the reservoir was two-fold. First, it was unknown how effective this reservoir was as a sediment trap to material that otherwise would have been transported down-river to the estuary and eventually to the ocean. The recent erosion of beaches along the Washington coast has been attributed to a decreased contribution of sediment from the Columbia River to the coastal system due to the damming of the river. Second, sediment accumulation on the floors of reservoirs along the Columbia River has been suggested to be diminishing salmon spawning grounds. The extent of changes in habitat since construction of the John Day Dam, however, had not been documented. Common data sets were needed to address both of these questions, and for these reasons this geophysical and sampling program was undertaken.

1. How should this data set be cited?

   Twichell, David C. , and Cross, VeeAnn A. , 2004, JPEG Images of the Floor of the John Day Reservoir - Acquired in 2000:.

   Online Links:

   This is part of the following larger work.

   Cross, VeeAnn A. , and Twichell, David C. , 2004, Geophysical, Sedimentologic, and Photographic Data from the John Day Reservoir, Washington and Oregon: Data Archive and Preliminary Discussion: Open-File Report 2004-1014, U.S. Geological Survey, Woods Hole Science Center, Woods Hole, MA.

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -120.63040

   East_Bounding_Coordinate: -119.835817

   North_Bounding_Coordinate: 45.844383

   South_Bounding_Coordinate: 45.691083

3. What does it look like?

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

   Beginning_Date: 25-Sep-2000

   Ending_Date: 27-Sep-2000

   Currentness_Reference: ground condition

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

   Geospatial_Data_Presentation_Form: remote-sensing image

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 882 x 1157 x 1, type Pixel

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

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 1.000000
      Ordinates (y-coordinates) are specified to the nearest 1.000000
      

7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview:

   The images have no inherent geographic positional information. The location of the image is based on a correlation of the time the image was acquired, and navigation that was simultaneously being acquired. These images are to be used in concert with the navigational shapefile jd2000.shp.

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • David C. Twichell
   • VeeAnn A. Cross

2. Who also contributed to the data set?

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

   David C. Twichell
   U.S. Geological Survey
   Oceanographer
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   

   (508) 548-8700 x2266 (voice)
   (508) 457-2310 (FAX)
   dtwichell@usgs.gov
   

To provide bottom images of the reservoir that will aid in the interpretation of the remotely sensed data.

1. From what previous works were the data drawn?

2. How were the data generated, processed, and modified?

   (process 1 of 2)

   Video imagery was collected with a SeaBOSS system from the Woods Hole Science Center.

   (process 2 of 2)

   The video information was written to DVD, and individual frames were then captured from this DVD. The time on the image is video time, not UTC or local time. The image saved was not necessarily at the time a bottom sample was acquired. In most cases the image is close to that time, but in some instances there are as much as a few minutes difference in time between the video picture and the grab sample.

   Person who carried out this activity:
   

   David C. Twichell
   U.S. Geological Survey
   Oceanographer
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   

   (508) 548-8700 x2266 (voice)
   (508) 457-2310 (FAX)
   dtwichell@usgs.gov
   

3. What similar or related data should the user be aware of?

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 observations, including topology?

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

Access_Constraints: None.

Use_Constraints:

The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.

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

   David C. Twichell
   U.S. Geological Survey
   Oceanographer
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   

   (508) 548-8700 x2266 (voice)
   (508) 457-2310 (FAX)
   dtwichell@usgs.gov
   

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

   Downloadable Data

3. What legal disclaimers am I supposed to read?

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	JPEG Size: 10.1

   • Cost to order the data:

Dates:

Last modified: 25-Mar-2004

Metadata author:

VeeAnn A. Cross
U.S. Geological Survey
Marine Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov

Metadata standard:

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

Metadata extensions used:

• <http://www.esri.com/metadata/esriprof80.html>