I downloaded GTOPO30 DEM archives from USGS(earthexplorer.usgs.gov/), and I just simply drag the file into QGIS, but somehow I find the elevation isn't the same with the actual scenery. I want to draw the terrain profile but the value isn't correct. I open the properties→ Metadata in QGIS and the maximum value is different from the official document.
The official specification is attached. The maximum value of this dem should be 6098, but at Qgis the Max is 4659.
Could anyone help me to deal with this error?