In planning a mission what is just before Verify Height

i have a question just before Verify Height” checkbox in Mission planner
there’s button with these
Reiative
absolute
terrain
please explain

In MP dropbox,
“Relative” is the altitude relative from your home .
So if your home is at 400 mt from see level and you set the waypoint_1 at 100 meters the absolute altitude will be at 500 meters .
The altitude for waypoint will be showed as “100”

With “absolute” in the dropbox , the altitude will be showed for each waypoint as absolute so waypoint_1 will show “500”

“Terrain”, the altitude will be showed for each waypoint as realtive BUT teh flight path will consider the terrain profile .

Look at these images caputred from Mission Planner Map menu , elevation profile.

This is with “relative” set :

The plane WILL CRASH in the hills

This is with “Terrain” set , 100 meters above waypoints AND terrain profile (not really the same path, it is just an example ):

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Thank you very much for the reply

so if i set
Terrain
default Alt 120
verify height
it will stay 120 above ground ?
is there anything else need to be running ?

You have to enable terrain folllowing in the parameters. once you have done that your drone will recieve terrain data a few seconds after you upload that flight plan, but it wont upload the data if your drone doesn’t have a gps signal.

Sir, Thanks very much for this explanation could you please describe in detail regarding elevation planning.