Wind fetch is the unobstructed length of water over which wind can blow from a certain direction. The wind fetch is typically calculated for many directions around the compass rose for a given location, which can then be incorporated into a larger model (such as the InVEST coastal vulnerability model; <http://data.naturalcapitalproject.org/invest-releases/documentation/2_2_0/coastal_vulnerability.html>), or simply averaged for a reasonable measure of the overall wind exposure for a specific marine location. The process of calculating wind fetch can be extremely time-consuming and tedious, particularly if a large number of fetch vectors are required at many locations. The 'fetchR' package calculates wind fetch and summarises the information efficiently. There are also plot methods to help visualise the wind exposure at the various locations, and methods to output the fetch vectors to a KML file for further investigation.
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