The main topic of this diploma work is to present several height systems and to compare calculated heights between different height systems in selected leveling line. For the test area part of Primorska from Koper to Kozina was selected. Levelling line is 37,351 kilometers long and is passing from point 9000 to point 2839, between 9000 and 2839 is 48 other points. Height difference between the lowest and the highest point is 497,98692 meters. Whole classical geodesy is based on point and the third coordinate of point is height. Heights are very important for geodesy and many other professions, because of that is very important that when one has to choose gone height system, it has to consider requests of many professions. Which height system is better to choose and what advantages or disadvantages has one height system, was common thread of
my diploma work. We have determined heights of the chosen levelling line in different height systems in the test area.
These are: normal orthometric heights, geopotential number, dynamic heights, orthometric heights and normal heights. The official height system in Slovenia are normal orthometric heights. The official height system in many European countries are normal heights and this height system would be most appropriate and useful for Slovenia too. Normal heights satisfy all five basic conditions for ideal height system. Normal heights are also very good connected with ellipsoidal heights.