Topographic Maps Remodelling When Changing Height System

The change of the coordinate and height system in one country as well as the transformation to another height level and system requires compulsory transformation of the local contents and of the represent of the relief. The height transformations are not so insufficient clarified in GIS and CAD products that s why this question is very important and gets really actual nowadays. There are many publications on the way of transforming the elevations of the benchmarks of the existing height systems and the calculation of the corrections of the elevations in the Baltic system in relation to the European Height System with an initial point the gauge in Amsterdam. Unfortunately a methodology for the practical transformation of the contour lines has not been developed yet. In this paper some basic issues and procedures on the practical application, related to the solution of this problem, have been discussed - how to correct the image of the relief, as part of the content of a digital map, while passing from one projection to another, respectively from one coordinate system into another. The problem is inevitably related to the transformation of heights, which is obligatory when changing the Sea level and the Height System. We can use this research and its results in similar studies and researches in SYRIA.