https://chs.coast.noaa.gov/htdata/Inundation/SLR/BulkDownload/VRTs/Htf/SLR_HTF_Major.vrt
https://chs.coast.noaa.gov/htdata/Inundation/SLR/BulkDownload/VRTs/Htf/SLR_HTF_Minor.vrt
https://chs.coast.noaa.gov/htdata/Inundation/SLR/BulkDownload/VRTs/Htf/SLR_HTF_Moderate.vrt