2019 Long Island Elevation

These are 10-foot contour polygons for most of Long Island, NY that were derived from the 1/3rd arc-second Digital Elevation Models (DEMs) in the USGS National Map 3DEP Downloadable Data Collection. The DEMs were resampled by a factor of 8 (giving a resolution of approximately 80 meters), categorized into 10-foot intervals, and then converted to polygons using the GDAL polygonize tool.

The DN attribute is the upper bound of the categorization: 10 = 0-10, 20 = 10-20, etc.