Increased occurrence of coastal flooding and sea level rise are two effects of climate change that threaten coastal cities. This week we performed a coastal flooding assessment to compare the rate of damage before and after Hurricane Sandy hit the New Jersey coastline. Then we used elevation models to delineate coastal flood zones in Naples, Florida.
For our hurricane damage assessment, we subtracted the pre-Sandy
raster from the post-Sandy raster. It was very clear when inspecting the resulting
rate of change raster what areas had the greatest concentration of damage. We
then compared the resulting image to a building footprint from 2019 that showed
what buildings were present at that time.
After learning how to use the reclassify and region grouping
tools to create a predictive map of a storm surge, we created a map using two
elevation models, a USGS DEM and a LiDAR derived DEM to predict areas and
buildings effected by a 1-meter storm surge. We then analyzed the type of
buildings affected and, presuming the LiDAR data was more accurate the errors
of omission and errors of commission associated with the data.
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