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?
I'll answer the easy question :) Absolute is above mean sea level, relative is above home, terrain is according to google maps data sent via MP. However I haven't tested this yet and how instructions will differ when using a laser range finder.
So how about "Verify Height"?Does it same as absolute ?
Thanks for your reply.And I have read your post,many problem you mentioned is my question.
Have you ever successfully test TF function?And can you post the TF setting? I badly need this fuction because my area is extremely hilly!
I want to fly in mountainous terrain.. What's your setting? Just set "TERRAIN_ENABLE to 1 and TERRAIN_FOLLOW to 1; and select terrain while mission planing,not select verify height and make sure terrain data available in SD card? Another question,my
another question,MP always prompt me "bad or no terrain data"///But I'M sure I do have the terrain data in SD card//
AND the prompt seem to disappear later///It's confusing//
Because my flying area is mountainous ///I plan to set "look ahead=500m"///
visualizing is indeed a question!
What does look ahead para mean.?
For example,if i set look ahead=500 m, fly height=200m, and if the Home alt=100 ,highest point's alt in the 500m distance ahead is 400m. What would happen ?
At the launch point,will it fly at 600m(200m higher than the highest point)?
Or just fly at 400m high to make sure the plane won't crash into the highest point?