If I adjust manually GCP for better geocode stack then elevation is readed automaticaly. By default external dem si SRTM. But if I look the log file then there was written elevation from ellipsiod (WGS84). It is confusing because EGM96 geoid unudaltion is added to SRTM model. Question: What elevation is referencted manual GCP? For example I copy command promt note.
north coordinate (UTM): 6361399.0
East coordinate (UTM): 532193.0
UTM Zone: 34
??ellipsoidal height (WGS84): 2 ??????