Journey to the Center of the Earth the center of the Earth. The travellers are swept away as the sea rushes into the large open gap in the ground. After spending hours being swept along at lightning speeds by the water, the raft ends up inside a large volcanic chimney filling with water and magma. Terrified, the three are rushed upwards, through stifling heat, and are ejected onto the surface from a side-vent of a stratovolcano. When they regain consciousness, they discover that they have been ejected from Stromboli, a volcanic island located in southern Italy. They return to Hamburg to great acclaimProfessor Lidenbrock is hailed as
Figure of the Earth that measurements are made on the apparent or topographic surface of the Earth and it has just been explained that computations are performed on an ellipsoid. One other surface is involved in geodetic measurement: the geoid. In geodetic surveying, the computation of the geodetic coordinates of points is commonly performed on a reference ellipsoid closely approximating the size and shape of the Earth in the area of the survey. The actual measurements made on the surface of the Earth with certain instruments are however referred to the geoid. The ellipsoid is a mathematically defined regular surface with specific dimensions. The