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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.
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DEM perspective image.
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| Name | Midway Atoll v2 | |||||||||
| States | Pacific Islands | |||||||||
| Region | Pacific Islands | |||||||||
| Extent |
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| Date Completed | 2012-05-14 | |||||||||
| Type | Coastal Inundation | |||||||||
| Horizontal Datum | WGS 84 | |||||||||
| Projection | Geographic (degrees) | |||||||||
| Vertical Datum | MHW (meters) | |||||||||
| Vertical Transformation | Source elevation data transformed vertically using a constant offset derived from NOAA tide stations. | |||||||||
| Coverage | Bathy-topo | |||||||||
| Cell Size | 1/3 arc-second | |||||||||
| Registration | Grid-node | |||||||||
| Version | 2 | |||||||||
| 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.