Where can I find bathymetric data?
The USGS has made bathymetric surveys for many coastal areas and for selected rivers and lakes in the U.S., including Yellowstone Lake, Crater Lake, and Lake Tahoe. Information and data for those studies is on the USGS Maps of America’s Submerged Lands website.
What information is included in bathymetric data?
Bathymetric data, which includes information about the depths and shapes of underwater terrain, has a range of uses: Nautical charts — These charts, based on bathymetric data, guide mariners the same way road maps guide drivers.
What is bathymetry data for?
Bathymetry is the measurement of the depth of water in oceans, rivers, or lakes. Bathymetric maps look a lot like topographic maps, which use lines to show the shape and elevation of land features. On topographic maps, the lines connect points of equal elevation. On bathymetric maps, they connect points of equal depth.
What is used in bathymetry?
The data used to make bathymetric maps today typically comes from an echosounder (sonar) mounted beneath or over the side of a boat, “pinging” a beam of sound downward at the seafloor or from remote sensing LIDAR or LADAR systems.
When was the first bathymetry map made in Ontario?
Bathymetry is the measurement of water depth in lakes. From the 1940s to the 1990s, the Ministry of Natural Resources and Forestry produced bathymetry maps for over 11,000 lakes across Ontario. The data can be used by the general public and GIS specialists for:
Where can I find the bathymetric data viewer?
The Bathymetric Data Viewer is an interactive map providing discovery, descriptions, and download capability for bathymetric survey data and digital elevation models archived at NOAA’s National Centers for Environmental Information (NCEI). Text search for locating completed and planned DEMs. Supplemental information regarding spatial reference.
How does the bathymetry index data class work?
The Bathymetry Index data class identifies if GIS vector lines have been created and the location of mapped lakes. The historic paper maps have been scanned into digital files. We will add new digital files to this dataset if they become available.
How are bathymetric contours used in ocean surveys?
This and other bathymetric sounding data collected by the U.S. National Ocean Service’s (NOS) Coast Survey and the U. S. Army Corps of Engineers was employed to construct bathymetric contours at 1 meter intervals from 1-10 meters depth and 2 meter intervals at depths greater than 10 meters. Compilation scales ranged from 1:10,000 to 1:50,000.