The article discusses how changes in volume and elevation of glaciers can be determined using Digital Elevation Models (DEM). The researchers explain how DEMs are created and used to measure these changes more accurately and economically compared to traditional methods. By applying DEMs to the Vernagtferner glacier in the Ôtztal Alps, they found that the required accuracy level can be achieved more cost-effectively. The study reveals changes in volume and elevation of the glacier between 1979 and 1982, showing the potential of DEMs for such analyses.