Finding out what objects are in a body of water by using sound waves.
One thing that hydrographic surveys are used to find is the depth of the water. Hydrographic surveys are also used in order to identify objects in the water.
USGS
August 1940 Lafayette Ronald Hubbard was sailing in front this Glacier on a US hydrographic survey mission
The cost of a hydrographic survey can vary depending on factors such as the size and complexity of the area being surveyed, the equipment and technology used, and the specific requirements of the project. Generally, costs can range from a few thousand dollars to tens of thousands of dollars. It is recommended to obtain quotes from multiple surveying companies to get a better idea of the potential cost for a specific project.
We don't know who reached the tip of Vancouver Island first, but James Cook and George Vancouver were the first to circumnavigate the island and do a hydrographic survey.
Norwegian Hydrographic Service was created in 1932.
Norwegian Hydrographic Service ended in 1986.
You can find hydrographic maps of the Earth through various online resources, such as government geological surveys, oceanographic institutions, and educational websites. Websites like the National Oceanic and Atmospheric Administration (NOAA) and the United States Geological Survey (USGS) provide access to detailed hydrographic data. Additionally, GIS platforms like ArcGIS or Google Earth may offer tools to visualize and analyze hydrographic features. Libraries and academic institutions may also have physical copies or databases available for research.
United Kingdom Hydrographic Office was created in 1795.
Pakistan Navy Hydrographic Department was created in 1959.
Correction: What is hydrographic datum? not "hydrography"
Kurt J. Schnebele has written: 'Application of Loran-C positioning to hydrographic surveying' -- subject(s): Loran, Hydrographic surveying