| | 5 | ellipsoid. This is derived from two parts, the geoid grid (vertical datum), and the height above mean sea level which usually comes from elevation cells, sometimes referred to as a digital elevation model(DEM). Elevation cells are relative to a given vertical datum. At runtime the ossimElevManager will supply sensor models with the height above ellipsoid which is "geoid_grid_point + elevation_cell_post. This happens automatically provided you have set up you ossim_preferences file correctly and have the appropriate data in you elevation repositories. |
