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Name: Submerged Aquatic Vegetation (SAV)
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Description: The distribution of the Submerged Aquatic Vegetation (SAV) in the Choptank River for the year 2014. SAV distribution in the Choptank River is currently measured on a yearly basis by the Virginia Institute of Marine Science (VIMS) SAV mapping progam. This program uses a consistent aerial photography methodology to assess the extent of SAV growth throughout the Chesapeake Bay at a scale of 1:24,000. The imagery is scanned, analyzed and processed to create vector digital data from which GIS programs can calculate areal extents of SAV beds (Orth et al. 2015).
The 2014 Chesapeake Bay SAV Coverage was mapped from 1:24,000 black and white aerial photography and digital multispectral imagery with a 25cm GSD to assess water quality in the Bay. Each area of SAV was interpreted from the rectified photography and classified into one of four density classes by the percentage of cover. The SAV beds were entered into an SDE GIS fetaure class using the quality control procedures documented below. The dataset contains all SAV areas that were identified from the areas flown. Some areas that are presumed to contain no SAV were not flown. Some small beds, particularly along narrow tributaries may not have been distinguishable on the aerial photography.
Copyright Text: Virginia Institute of Marine Science
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