File:A bathymetric contour map of Castle Lake, Mount St. Helens.jpg
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English: Researchers map the bottom of Castle Lake, near Mount St. Helens. For three days, researchers ran a small boat over the lake surface equipped with an acoustic Doppler current profiler (ADCP). The ADCP bounces an acoustic wave off the bottom that is reflected back to a mobile receiver in the boat. The frequencies of the send-receive pairs are used to calculate depth. More than 191,000 water-depth measurements were integrated with high-precision GPS and airborne lidar data. A GIS was then used to compute lake area and capacity for any given surface elevation and to generate a bathymetric map. |
| Date | |
| Source | https://www.usgs.gov/media/images/a-bathymetric-contour-map-castle-lake-mount-st-helens |
| Author | Mosbrucker, Adam |
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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:10, 15 June 2019 | | 1,373 × 1,026 (498 KB) | Simon04 (talk | contribs) | User created page with UploadWizard |
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