When we download the ALOS world 3d dem dataset from the JAXA website the output contains 6 files 3 0f which are Geotiff files, namely DSM file(DSM), Mask file(MSK), Stalking number file (STK).
How can I convert them into a HGT so use as a DEM for terrain correction? please guide.
the DSM is the elevation information you are looking for. It is stored in WGS84, so you can directly use it as “External DEM” in the Range Doppler Terrain Correction module.