Description

The U.S. Geological Survey performed a bathymetric survey of Groundhog Reservoir using a man-operated boat-mounted multibeam echo sounder integrated with a global positioning system (GPS) and a terrestrial real-time kinematic (RTK) GPS in June 2011. The multi-beam echo sounder collected data at lake depths of approximately 3 feet and greater, whereas the terrestrial topographic survey was performed with the RTK GPS in shallow areas near the shore not navigable by boat to the elevation of the top of the dam plus about 2 to 3 additional feet. Bathymetric data from the multibeam echo sounder were collected June 27-29, 2011, and were compiled and stored using the hydrographic survey software, HYPACK 2010 from HYPACK, Inc. (HYPACK, Inc., 2010). The data were interpolated onto a 2-meter grid by computing the average of the data in each cell and positioning the mean at the cell center. The data were converted to elevation above the National Vertical Datum 1988 (Gesch and others, 2002) using reservoir stage. The bathymetry and GPS datasets were then imported into ESRI Arcmap so elevation contours could be determined. The data were used to create a Triangulate Irregular Network (TIN). This TIN was converted to a 2-meter raster dataset which was subsequently contoured. The contour lines were smoothed using a generalized 500 technique (ESRI, 2010). Some holes in the smoothed contour dataset were removed manually and some of the contours were manually adjusted to connect contours and fix any other issues. This created the final contour map.References:Environmental Systems Research Institute, Inc., 2010, ArcGIS—A complete integrated system: Redlands, Calif, ESRI. Accessed Oct. 17, 2011, from http://www.esri.com/software/arcgis/.Gesch, D., Oimoen, M., Greenlee, S., Nelson, C., Steuck, M., and Tyler, D., 2002, The National Elevation Dataset: Photogrammetric Engineering and Remote Sensing, v. 68, no. 1, p. 5-11.HYPACK, Inc., 2010, HYPACK® 10.0.5.31, Hydrographic survey software user manual: Middletown, Conn., HYPACK, Inc. [various paged], accessed Oct. 5, 2011, from http://www.hypack.com/new/Support/DocumentsManualsTechnicalArticlesetc/tabid/81/Default.aspxKohn, M.S., 2012, Bathymetry of Groundhog Reservoir, Dolores County, Colorado, 2011: U.S. Geological Survey Scientific Investigations Map 3202, scale 1:8,000 [http://pubs.usgs.gov/sim/3202/].U.S. Geological Survey, 2011, Colorado StreamStats: U.S. Geological Survey, accessed Oct. 17, 2011, from http://streamstatsags.cr.usgs.gov/co_ss/default.aspx?stabbr=co=1323879434710

General Information

• This data is described at

  http://catalog.data.gov/dataset/2011-groundhog-reservoir-bathymetric-contours Do you think this data is incorrect? Let us know

• This data is published by

  U.S. Geological Survey, Department of the Interior Do you think this data is incorrect? Let us know

Legal Information

• The rights statement is at

  http://catalog.data.gov/dataset/2011-groundhog-reservoir-bathymetric-contours Do you think this data is incorrect? Let us know

• Outside the US, this data is available under

  Creative Commons CCZero Do you think this data is incorrect? Let us know

• There are

  yes, and the rights are all held by the same person or organisation Do you think this data is incorrect? Let us know

• The content is available under

  Creative Commons CCZero Do you think this data is incorrect? Let us know

• This data contains

  no data about individuals Do you think this data is incorrect? Let us know

Practical Information

• The data appears in this collection

  http://catalog.data.gov/organization/usgs-gov Do you think this data is incorrect? Let us know

• This data changes

  no Do you think this data is incorrect? Let us know

• The data is

  backed up offsite Do you think this data is incorrect? Let us know

Technical Information

• Releases of this data are listed at

  http://catalog.data.gov/api/rest/package/2011-groundhog-reservoir-bathymetric-contours Do you think this data is incorrect? Let us know

Social Information

• The documentation includes machine-readable data for

  title Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  description Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  identifier Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  landing page Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  release frequency Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  publisher Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  distribution(s) Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  release date Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  modification date Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  temporal coverage Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  spatial/geographical coverage Do you think this data is incorrect? Let us know

• The documentation about each distribution includes machine-readable data for

  release date Do you think this data is incorrect? Let us know

• The documentation about each distribution includes machine-readable data for

  a URL to access the data Do you think this data is incorrect? Let us know

• The documentation about each distribution includes machine-readable data for

  a URL to download the dataset Do you think this data is incorrect? Let us know

• Find out how to contact someone about this data at

  http://catalog.data.gov/dataset/2011-groundhog-reservoir-bathymetric-contours Do you think this data is incorrect? Let us know

• Find out how to suggest improvements to publication at

  http://www.data.gov/issue/?media_url=http://catalog.data.gov/dataset/2011-groundhog-reservoir-bathymetric-contours Do you think this data is incorrect? Let us know