The Hurricane Sandy DEMs can be downloaded on a tile-by-tile basis using the
web mapping interface on the project webpage (http://www.ngdc.noaa.gov/mgg/inundation/sandy/sandy_geoc.html), or
alternatively via a "bulk download" of the staged tiles (http://www.ngdc.noaa.gov/mgg/inundation/sandy/data/tiles/).

The DEM tiles have been grouped according to their spatial resolution. Each resolution-specific directory will contain many individual files, 
so users will generally want a mechanism that allows downloading in bulk. One option is to use Wget (freely available at http://www.gnu.org/software/wget/),
a command line utility that is very flexible and works on multiple platforms.

An example usage of Wget is given below.

To download all the .tif files in http://www.ngdc.noaa.gov/mgg/inundation/sandy/data/tiles/zip13/
(i.e. the 1/3 arc-second bathymetry tiles), execute the following wget command in a command or terminal window:

wget -nd -r -l1 -A.tif http://www.ngdc.noaa.gov/mgg/inundation/sandy/data/tiles/zip13/

Other options are available, and a Web search for "download manager" should provide some useful results.

For more information regarding the Hurricane Sandy Digital Elevation Modeling project at
NOAA NCEI, please see "A framework for a seamless depiction of merged bathymetry and topography
along U.S. coasts" (Eakins et al., 2015; linked on the project webpage).

Questions? Please contact dem.info@noaa.gov