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Bathymetric surveys and charts are associated with the science of oceanography, particularly marine geology, and underwater engineering or other specialized purposes. Bathymetric map of Medicine Lake, California. Bathymetric data used to produce charts can also be converted to bathymetric profiles which are vertical sections through a feature.
On nautical charts, the top of the chart is always true north, rather than magnetic north, towards which a compass points. Most charts include a compass rose depicting the variation between magnetic and true north. However, the use of the Mercator projection has drawbacks. This projection shows the lines of longitude as parallel.
Oil production began from a man-made offshore island off Seal Beach in 1953. The first strictly offshore oil field in California was the Belmont Offshore Field, discovered in 1948 1.6 miles (2.6 km) from the shore of Seal Beach; production did not begin until 1954 when a man-made island was built in 40 feet of water for drilling and production ...
Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging, offshore wind farms, offshore oil exploration and drilling and related activities. Surveys may also be conducted to determine the route of subsea cables such as telecommunications cables, cables ...
Metrication of Admiralty charts began in 1967, and it was decided to synchronise this with the introduction of a new style of chart, with increased use of colour, which continues in use today. The most striking change is the use of buff for land. Green is used for drying (intertidal) areas, and magenta to indicate lights and beacons.
Plans to restart a pipeline in Santa Barbara County have angered residents worried about an oil spill similar to the massive one near Refugio State Beach in 2015.
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