This Midway Atoll DEM updates the initial Midway Atoll DEM of 2009 using new topographic lidar data collected by the U.S. Geological Survey. The integrated bathymetric-topographic DEM covers Sand Island and Eastern Island, collectively called Midway Island, and extends onto the slopes of the volcanic pedestal. The DEM has a 1/3 arc-second (~10 meter) cell size, and is referenced to a vertical datum of mean high water. A larger, 3 arc-second (~90 meter) DEM was also developed. The DEMs were built in May 2012 to support NOAA's Tsunami Program.
|Name||Midway Atoll v2|
|Horizontal Datum||WGS 84|
|Vertical Datum||MHW (meters)|
|Vertical Transformation||Source elevation data transformed vertically using a constant offset derived from NOAA tide stations.|
|Cell Size||1/3 arc-second|
|Source||NOAA / NGDC / MGG|
|Developer||NOAA / NGDC / MGG|
|Project||NOAA Tsunami Inundation|
|Contact||Barry W Eakins @ NOAA / NGDC|
WARNING: DEM not to be used for navigation.