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Ports and harbor surveys cover a collection of topographic
elevations and hydrographic depths to assess the condition of navigation
channels to quantify and determine dredging requirements, the condition
of navigation structures, such as jetties and breakwaters, and adjacent
shoreline. Such surveys are typically conducted for national or
state governments, as well as local port authorities. This often
involves a baseline survey and subsequent "call out" surveys to
monitor the change in conditions in the port and harbor.

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