Control surveys can be carried out to inform the following : determination of scales for photogrammetric mapping, establishment of precise coordinates based on a universal mapping system, establishment of sites for hydrographic charts, mine construction, or the routing of highways and transmission lines.
12.
Even though, in places, hydrographic survey data may be collected in sufficient detail to portray bottom topography in some areas, hydrographic charts only show depth information relevant for safe navigation and should not be considered as a product that accurately portrays the actual shape of the bottom.
13.
More recently geologists took advantage of the extensive excavations associated with road-building in the 1980s and 1990s to examine the rock strata and other geological features affected by the volcanic eruptions of Santorini and the deposits of volcanic ash which fell on Anafi A hydrographic chart of the island ( " Anaphi, Pasha and Makrea " ) from 1859, under the direction of Captain Thomas Spratt ( 1811-1888 ) of HMS Medina, can be found in the archives of the UK Hydrographic Office, accessioned 4 June 1860 and ref D4737.
14.
These included : production of air navigation charts for the Royal Australian Air Force covering Australia and a large area of its region totalling about eight percent of the earth's surface; printing hydrographic charts for the Hydrographer Royal Australian Navy; joint and single service training area special surveys, maps and models including live fire requirements; vital asset protection maps; safeguarding maps for ammunition depots; digital terrain data and models for command and control, communications, intelligence, surveillance, reconnaissance, simulation, weapons and geographic information systems; photomaps using air and satellite photography.
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