Promptly updated digital elevation models (DEM) that reflect the topography of the Earth are essential for many purposes, including geohazard mitigation. Current technologies for generating DEM are mainly based on images from airborne and low-earth-orbiting (LEO) space-borne sensors. The DEM update rates from such sensors are limited due to the low revisit frequency of the sensor platforms. It is therefore important to explore new ways for generating promptly updated DEM. Research on generating daily DEM based on future geostationary synthetic aperture radar (GEOSAR) data is published in this special issue entitled Geodesy and Surveying Engineering. The research demonstrates that daily DEM generation based on GEOSAR data and the interferometric SAR (InSAR) concept is possible, although further research is needed to enhance the accuracy of such DEM. The cover image shows the topography of an area generated from NASA's Shuttle Radar Topography Mission and used to simulate the quality of GEOSAR interferograms in the research.