I downloaded the tile of "NASADEM_HGT_n27e086" from Earthdata Search. However, the maximum elevation in this tile is only 8781 meters, which is not equals to the elevation of Mt. Everest (8848 meters). What causes the large difference here? If this is caused by the vertical uncertainty, how could we trust the vertical accuracy in other regions?
The NASADEM User Guide doesn't have any information on its vertical accuracy. It's based on SRTM (along with few other DEMs), which does full fill mission performance requirements of 16 m absolute vertical error. I don't know what's causing the large difference. We have reached out to our science experts for any guidance.
As mentioned in the previous reply it's based on SRTM (along with few other DEMs), which does full fill mission performance requirements of 16 m absolute vertical error. At this time the Private Investigator (PI) has not replied to our request for further guidance. We apologize for the inconvenience.