Once you have the coordinates of your waypoints you can do copy/paste them on a .csv file and then import it into the Litchi online portal to have the mission ready to be loaded on your tablet
Hi, I'm new to the site and stumbled upon this post as I was browsing the web. But anyway, if you still require to know how to get your drone to change levels during flight, you don't HAVE to use Google earth.
Litchi has a feature that alters flight altitudes according to ground elevation. All you have to do after you have plotted your course and set your altitude, is batch select ALL of your waypoints except your first and your last.
Then choose edit, and at the very top, you will see it says 'altitude xx ft/m relative to' click on the drop down box and select ground.
The will change all of your waypoint heights and set the altitudes relative to ground level. If the terrain rises, your drone will rise. If terrain falls, the drone will lower accordingly.