*2.4. Historical Aerial Photographs*

Historical vertical and oblique aerial photographs, including photographs not used in the original shoreline mapping [23–25], were analyzed (Table 2). These photographs were not added to the shoreline database due to a combination of scale, photo quality (i.e., ability to distinguish a high-water line), poor georeferenced accuracy or high wave energy at the time of image collection; however, the images were still suitable for qualitative analysis of barrier morphology and vegetation cover. Vertical aerial images were georeferenced in ESRI ArcMap to the 2014 U.S. Geological Survey digital orthophotographs for qualitative comparison, and images were examined to document historical changes in geomorphology—notably, the presence of washover fans and/or the presence of dune vegetation. Additionally, context on pre- and post-1938 hurricane conditions was determined from oblique aerial photography (Figure 5).
