Welcome to the Earthdata User Forum! Here, subject matter experts from several NASA Distributed Active Archive Centers (DAAC) can discuss general questions, research needs and data applications. Users can query how to access, view and interpret the data.
by lihaijun » Wed Jun 16, 2021 5:01 am America/New_York
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 user is right about what he observed w/ the NASADEM tile.
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.