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Bathymetric and geophysical surveys of Englebright Lake, Yuba-Nevada Counties, California

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?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• 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?

What does this data set describe?

1. How should this data set be cited?

   Childs, Jonathan R. , Snyder, Noah P. , and Hampton, Margaret A. , 2003, Bathymetric and geophysical surveys of Englebright Lake, Yuba-Nevada Counties, California: U.S. Geological Survey Open-File Report 03-383.

   Online Links:

   • <http://geopubs.wr.usgs.gov/open-file/of03-383/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -121.28333

   East_Bounding_Coordinate: -121.19167

   North_Bounding_Coordinate: +39.33333

   South_Bounding_Coordinate: +39.23333

3. What does it look like?

   <http://geopubs.wr.usgs.gov/open-file/of03-383/figure1.gif> (GIF)

   Planimetric map of the Upper Yuba River Watershed Studies Program (UYRSP) area. Small rectangle (in red) around Englebright Lake shows the geographic limits of the maps in this report. 968x774 pixels, 34k bytes.

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

   Beginning_Date: 01-May-2001

   Ending_Date: 30-May-2001

   Currentness_Reference: ground condition

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

   Geospatial_Data_Presentation_Form:

   text report containing graphical map images (no direct spatial referencing)

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

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

7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview:

   Geographic features (lake bathymetry, pre-dam topography, sediment thickness) are shown as color-contour map images at an unspecified projection and scale. These map images are rendered in Graphic Interchange Format (GIF).

   Entity_and_Attribute_Detail_Citation: <http://geopubs.wr.usgs.gov/open-file/of03-383/>

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Jonathan R. Childs
   • Noah P. Snyder
   • Margaret A. Hampton

2. Who also contributed to the data set?

3. To whom should users address questions about the data?
   Jonathan R. Childs
   United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
   Geophysicist
   USGS, MailStop 999, 345 Middlefield Road
   Menlo Park, CA 94025-3561
   USA
   

   (650) 329-5195 (voice)
   jchilds@usgs.gov
   

Why was the data set created?

These data are intended for science researchers, policy makers, and the general public.

How was the data set created?

1. From what previous works were the data drawn?

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

   Date: 10-Aug-2003 (process 1 of 1)

   The bathymetry data were collected along continuous boat tracks at a 2 second sample interval. Pre-dam topography was digitized from archival survey records. Bathymetric and elevation models were created at 5-meter grid cell, and the models differenced to calculate sediment thickness and volume.

   Person who carried out this activity:
   

   Jonathan R. Childs
   United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
   Geophysicist
   USGS, MailStop 999, 345 Middlefield Road
   Menlo Park, CA 94025-3561
   USA
   

   (650) 329-5195 (voice)
   jchilds@usgs.gov
   

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

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?

   Data have not been independently verified.

2. How accurate are the geographic locations?

   1.0 meters

3. How accurate are the heights or depths?

   One percent (1%) of the water depth for bathymetry; 10 feet for pre-dam topography and sediment thickness.

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

   A trackline map is shown at <http://geopubs.wr.usgs.gov/open-file/of03-383/figure2.gif>
   Boat tracklines (in blue) along which reservoir depth (bathymetry) measurements were made. Cross symbols in the South Yuba River and northern reach of the Yuba River (in green) indicate points where water depth was extrapolated along the pre-dam thalweg for gridding purposes.

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

   Approximately 18,500 depth points along the ship tracklines shown in Figure 2 were used to construct the surface of the reservoir floor. In the upstream end of the reservoir (on both the Yuba River and South Yuba River arms), the water was too shallow to survey. In each of these two areas, an artificial set of depth points (shown as green symbols in Figure 2) was estimated by linear interpolation along the river thalweg from the end of the boat survey to the point upstream on the pre-dam topographic map where the river bed elevation equals the dam spillway datum (160. 6 m, 527.0 feet). These irregular x,y,z data points were gridded at approximately 6 meter (20 foot) grid interval using the blockmedian and surface algorithms in Generic Mapping Tools. The blockmedian algorithm filters and grids the input (x,y,z) data using L1 norm, and surface creates a continuous curvature surface. A tension value 0.4 was used in the surface process. The resulting reservoir bathymetry is shown in <http://geopubs.wr.usgs.gov/open-file/of03-383/figure3.gif>

How can someone get a copy of the data set?

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

Access_Constraints: None

Use_Constraints:

These data are not intended for navigational purposes. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

1. Who distributes the data set? (Distributor 1 of 1)
   United States Geological Survey (USGS) Information Services
   Box 25286
   Denver, CO 80225
   USA
   

   1-888-ASK-USGS (voice)
   

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

   USGS Open-File Report 03-383

3. What legal disclaimers am I supposed to read?

   Please recognize the U.S. Geological Survey (USGS) as the source of this information.
   USGS-authored or produced data and information are in the public domain.
   Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user.
   Neither the U.S. Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.
   Trade, firm, or product names and other references to commercial products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

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

     Data format:	Bathymetry, tracklines, pre-dam topography, and sediment thickness map images in format GIF (version 89a)
     Network links:	<http://geopubs.wr.usgs.gov/open-file/of03-383/>

   • Cost to order the data: None

Who wrote the metadata?

Dates:

Last modified: 10-Aug-2003

Metadata author:

Jonathan R. Childs
United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
Geophysicist
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA

(650) 329-5195 (voice)
jchilds@usgs.gov

Metadata standard:

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