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[cartography] The science of measuring and charting the depths of water bodies to determine the topography of a lake bed or seafloor.

ArcGIS for Maritime: Bathymetry
Main Features Resources What You Get Pricing
Realize the Value of Your Bathymetric Data ...

Bathymetry - Although it is still beyond our reach to acquire precise and high-resolution seafloor depths from space, LIDAR bathymeters on fixed wing and rotary aircraft can penetrate the water column to collect seafloor data at depths of up to approximately 230 feet (70 meters).

Bathymetry is the measurement of the depth of underwater features; the word is derived from two Greek words which mean deep and measure ...

Contours of depth (of the water) describing the shape of the bottom of a water body. (Also referred to as Isobaths.)
Baud Rate ...

~ Data
The best source of global ~ data appears to be the ETPO2 data set available from the NGDC. The data is available on CD for USD $75 but an online map of tiles is offered that allows you to view the full resolution imagery for free.

The relief of ocean and lake floors. ~ is usually measured in units of distance below mean sea or water level and is mapped using contour lines called isobaths in a similar fashion to terrestrial topographic maps.
Bearing ...

Digital ~ Data Base (U.S. government)
Diameter at breast height ...

The measurement of ocean depths and the preparation of topographic maps of the ocean floor.
The principal ore of aluminum. A mixture of aluminum oxides and hydroxides that forms from intense chemical weathering of a soil in tropical environments.
Bedding: ...

bathymetric map See: map, bathymetric ~ Science of measuring water depths (usually in the ocean) to determine bottom topography.

Export ~ and floodplain elevation data from ARC/INFO to RMA-2V and develop finite element grid. This step occurs only once.
Determine shear velocities at steady-state conditions in the TIP for the flow condition of interest, and import the results into ARC/INFO as a point coverage.

Physical Vector Data Themes: Include coastline, land, ocean, minor islands, reefs, physical region features and points, rivers, lakes, glaciated areas, Antarctic ice shelves, ~, geographic lines, and graticles.

The visible and near-infrared regions provide information on water turbidity, ~, currents, and sediment plumes. (Water containing large quantities of suspended sediment has a higher reflectance than clear water and can be easily separated using satellite data).

The digital elevation model (DEM) is a raster-based digital dataset of the topography (altimetry and/or ~) of all or part of the Earth (or a telluric planet).

For example, it is possible to select a group of cells whose values are within a range of ~ in an ~ raster grid and whose values are within a range of slope in a slope raster grid, ...

Gnomonic projection on an icosahedron, topography and ~ color-coded (original data by NASA's Blue Marble Next Generation project), poles on vertices, (2476 KB PDF)
Gnomonic projection on an icosahedron, flat colors, poles on vertices, (1175 KB PDF) ...

See also: See also: What is the meaning of Feature, Information, Location, Map, Elevation?

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