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Declining permission for Map Pilot to exceed max height setting

I had set my Max Flight Height in the DJI Go4 App to 59m (193ft).  The Map Pilot mission flight was set to 180ft.  Upon uploading the mission to the aircraft, I received a message asking if I accepted Map Pilot increasing the Max Height because the Max Height will be exceeded during the flight (per the warning message). 

The message didn't say what the new Max Height would be or how much the increase was.  So, I declined granting permission for the setting change.

I was flying in Class D Airspace and the FAA height limit at that location was 200ft.  Hence, I was being cautious about not exceeding 200ft AGL.

Declining this setting adjustment stopped the upload process and I couldn't fly the mission.

I turned on Terrain Awareness (which wasn't really needed as the area was very flat).  But I ultimately got the same warning message about Max Height will be exceeded.

1) Had I accepted the setting adjustment, what would have been the new Max Height?

2) How can I tweak my settings or flight plan so I don't receive this Map Pilot warning message?

Thanks.

 

 

Osprey

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When the aircraft is under waypoint flight that is programmed by Map Pilot it will honor your flight height setting. BUT when you hit return to home it is no longer looking at the elevation difference any more and will just go straight. We have to take into account the possibility that someone flew up over a hill so we try to add 40 meters to the highest terrain that was encountered in the mission planning to use as the return to home height. We know this isn't perfect but it is something we have to plan for and work with. 

Setting the max height in DJI Go won't take terrain changes into account either. That is likely why the flight didn't upload properly. You put a limit in there and Map Pilot was trying to program a flight that exceeds that value.

Declining the add the 40 meters does just that, it doesn't add 40 meters to the maximum return to home value and it will just return to home at whatever altitude it is currently flying at. 

1. The max height would have been set to 180 ft + 40 meters. 

2. The best thing to do here is to program flights that you know you are going to be able to stay in RC connection for and are able to complete in one battery to keep it from going into RTH. If you do this it will follow terrain adjusted waypoint control for the whole flight. 

Zane
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Thanks Zane.  Just a few follow-up questions to make sure I understand this.

1) Map Pilot will add 40m to max terrain for RTH even if you're NOT using Terrain Aware?

2) Is there anyway to know what Map Pilot's RTH height will be for the mission?

3) I have yet to fly a multi-battery mission.  So, Map Pilot automatically uses RTH when it is time to change the battery partially thru a mission?

4) When using Map Pilot, none of DJI's RTH safety features will be utilized (i.e. obstacle avoidance, Smart RTH, etc)?

Thanks!

  

 

Osprey 0 votes
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1. No, not always. Map Pilot uses the aircraft's current RTH height setting for normal flights. If you are using Terrain Aware you are presented with a warning that is basically saying you should add 40m to the RTH height. This can be declined. 

2. It is set to the flight altitude. But if you are flying Terrain Aware and you fly up a hill it will come home at whatever altitude the aircraft is current flying if that is higher that the RTH height. 

For example, you set the flight height to 120 meters (~400 ft) and the aircraft goes up a hill at 400 ft AGL. If the RTH is triggered and the aircraft is now 600 ft above takeoff level (still 400 ft AGL) it will return home at 600 ft above takeoff level regardless of any terrain differences. 

3. RTH is triggered when the battery detects that it only has enough power to make it home, the button in the app is pushed or the button on the remote is pushed. If you program a small flight that is able to be done before the battery runs out RTH is not used and the whole flight is done under waypoint flight control which is executed a the programmed flight altitude. '

4. Map Pilot currently (as of 4.1.10) honors the obstacle avoidance setting that is made in DJI Go. (Map Pilot doesn't touch it) We have heard of a lot of issues with people flying with obstacle avoidance on. Smudges on the optics can trick the system into thinking there is something there and it boots you out of programmed flight mode which leaves the aircraft hovering. Smart RTH is not disabled if it is already enabled either.

Zane 0 votes
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OK, I believe I follow all that and how the plus 40m is implemented (if accepted) when using Terrain Aware.

However, I'm still confused as to why I couldn't upload my initial mission -- which was NOT using Terrain Aware.

Mission height was 180ft.  RTH height (set in DJI Go4) = 193ft 

But then I got the message stating "Maximum Height will be exceeded. Can Map Pilot increase max height?"  After declining this, I couldn't upload the mission.  

Thanks

Osprey 0 votes
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It sounds like you still have DJI Go running in the background. Map Pilot does not have a message that says "Maximum Height will be exceeded". If you are running DJI Go that is likely part of the problem. 

Please post a screenshot of this message so we are sure we are seeing what you are seeing. 

Feel free to email the .mme file to us to. 

Zane 0 votes
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OK.  I don't think I had DJI Go4 running in the background, but I'll certainly double check to make sure it isn't the next time I attempt this flight.  Thanks!

Osprey 0 votes
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Hi Zane -- Here is a photo of the error message I receive in Map Pilot when trying to upload a mission. 

I haven't been back to that particular site where I originally received this message.  However, at a different site, using the same Max Flight & RTH settings in DJI Go4 and the same 180ft Flight Height for the Map Pilot mission, I received the same message.

I double checked that DJI Go4 was not open in the background when running Map Pilot.

I've synced my Flight Plans to MME, but how would I export the mme file so I could send that to you?

Thanks.

Osprey 0 votes
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That error means that the terrain adjusted waypoint is higher than what you have set as the aircraft's maximum altitude. If you set the max altitude to 180 ft and then fly at 150 ft AGL but fly up a 40 ft hill (total of 190 ft) this warning will show.

Zane 0 votes
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So, even though I'm not using Terrain Aware, there are still terrain adjusted waypoints?

 

Osprey 0 votes
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No, if you are not using Terrain Awareness then you must be attempting to set the flight altitude higher than the limit you set in DJI Go. There is a 5 ft buffer in there so setting the aircraft to fly at 180 ft and having the limit set to 183 ft isn't going to work. Either raise your limit to 190 ft or fly at 170 ft. 

Zane 0 votes
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