I test terrain following last week,but failed badly,almost lost my plane!There were some problem puzzling me.
First,what's the difference between Absolute and Terrain?I have read "http://plane.ardupilot.com/wiki/common-terrain-following/",it says as bellow
But it didn't mention what should be done in the MP? Does all I need in the MP is just to choose "Terrain"?
Second, should I both choose the "Terrain" and "Verify Height"? I see that once I choose "Verify Height",the "Alt" will change.but i can't figure out the relationship.
Last, sometimes "no terrain data"will show in the MP if I connect PIX.I think it's beceuse I set "TERRAIN_ENABLE to 1 and TERRAIN_FOLLOW to 1",and no terrain data in SD card. Does that mean that if no prompt shows,terrain follow is ok?