The United States geoid models relate the difference between the GRS80
ellipsoid and the NAVD88 vertical datum..
The "GEOID99" vertical transform has the following parameters:
|
Parameter Name |
Parameter String |
Units |
|
Path to directory containing grid files |
path |
String |
|
File extension of grid files |
extension |
String |
The path parameter can either be fully qualified or relative to the location of the data source file in which it is defined. The path string should not end with a slash character.
For more information, please consult the NGS Website.