The graduation thesis presents the application of RTK-positioning method for calculating the volume of the landfill in real time. At the field work we have used instrument Leica Viva GS15, which includes programs to calculate the volume from discrete points while measuring. The first purpose of the study was to estimate the error resulting from two sets of discrete point positions that were gathered independently. Two independent sets of points’ positions were used to estimate the difference of volume computation due to different spaced discrete points on the landfill. Furthermore, we have used the same positions of discrete points for the subsequent volume calculation in the program Surfer, which includes several interpolations and consequently several options of volume calculation. The objective was to examine which interpolation method and grid-cell size is used for volume calculation in the Leica Viva Survey+ software. For the specific landfill we found out that the volume calculation is strongly affected by the size of the area of the landfill, while the size of the grid distinctly does not affect the final solution. We have shown that various interpolations significant impact the calculated volume, and that it makes sense to calculate the volume from independent samples of discrete points. Finally, we confirmed that the Survey+ program uses triangulation with linear interpolation at the grid about the size of a centimeter.