These data are stored as profiles with 30-meter spacing along and between each profile. The unit sizes in Alaska vary depending on the latitudinal location of the unit. The spacing between elevations along profiles is 2 arc seconds of latitude by 3 arc seconds of longitude. A few units are also available using the World Geodetic System 1984 Datum. Spacing of the elevations along and between each profile is 3 arc seconds with 1,201 elevations per profile.
Additional formats are available for some data sets.
The 1-degree DEM data is available online . Technical, Ordering, and Availability Information Contact any Earth Science Information Center for additional information or to place an order.