The ultimate goal of this master's thesis is to describe and develop a computer program that uses digitized graphical trajectory charts to calculate the minimum quadrant elevation for all charges for the 122mm D30-J howitzer, thus verifying the possibility of reaching a target over hilly terrain. The introduction of the thesis explains the basic concepts necessary for understanding the work and the influence of topography on the selection of firing positions. In the main part of the thesis, the process of converting the graphical firing tables for all charges of the mentioned weapon into a digital tabular form is described. This is done by reading and entering the projectile flight height for different ranges with barrel elevation increments of 1-00 thousandths and dividing the trajectory into 1000m range increments in the Microsoft Excel program. Then, the process of program development is described, as well as the functioning of the program, which uses the obtained tables and inputted data for the terrain configuration between the firing position and the target to display the possibility of reaching the target for the selected charge(s). Finally, examples of calculating the minimum quadrant elevations for all charges and graphical representations of the projectile trajectory for the selected charge(s) are presented.