Download Ellipsoidal Toolbox Manual

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Download Ellipsoidal Toolbox Manual 1

Geoid ModelsThe National Geodetic Survey has released updated models for transforming heights between ellipsoidal coordinates and physical height systems that relate to water flow. These models cover regions including the conterminous United States (CONUS), Alaska, Hawaii, Puerto Rico, the Virgin Islands, Guam and the Commonwealth of the Northern Mariana Islands, and American Samoa. GEOID12B transforms to NAVD 88 in CONUS and Alaska and to the respective datums for all the other regions (each having its own datum point). Models for the Deflection of the Vertical have also been released for these same regions mainly for aid in navigation systems.