From the DM article: "The TanDEM-X mission is to generate a global digital elevation model – WorldDEM – of unprecedented quality, accuracy and coverage. This DEM is intended to be the replacement dataset for SRTM and will be available in 2014 for the Earth’s entire land surface – pole to pole. The accuracy of the WorldDEM will surpass that of any satellite-based elevation model available today and will have the following unique features:
- Vertical accuracy of 2m (relative) and 10m (absolute)
- 12m x 12m raster
- Global homogeneity
- Highly consistent dataset as a result of an initial global data collection window of 2.5 years and the opportunity to continue to collect locally beyond the initial collection period
- No need for ground control information due to the high geometric precision of German sensors "