Altitude measurement and processing of their values

The main task of this paper is to describe altitude measurement methods and specify how to process the obtained altitude values for better use. Altitude is a very important parameter that affects many human activities like geographical surveys, geometry, aviation, sport, and more. For these reasons, it is necessary to measure altitudes and to process the obtained values in order to use them wherever it is needed. Some different altitude measurement methods will be described, a characteristic of the existing altitude measurement projects on Earth will be outlined and finally, design a way how to process the large amount of this data in the next step in order to make a visualization of a part of the Earth's surface