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Max altitude

Rocket 3 GT

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Just got the new mini 4 Pro and i was wondering if the max altitude that DJI has incorporated can be bypassed? I live in a very mountainous area and I can easily be at the max height restrictions used by DJI and still be way under the 400’ AGL the FAA requires. Is there any chance that DJI might use AGL rather than height above takeoff as a parameter?
 
Just got the new mini 4 Pro and i was wondering if the max altitude that DJI has incorporated can be bypassed? I live in a very mountainous area and I can easily be at the max height restrictions used by DJI and still be way under the 400’ AGL the FAA requires.
Your drone has two Height limits.
One is baked into the firmware and won't allow your drone to ho higher than 1640 feet (500 metres).
The other is a user configurable limit which you can adjust to whatever you choose (up to 1640 ft).
By default the drone comes with this set to 400 ft.
Is there any chance that DJI might use AGL rather than height above takeoff as a parameter?
No .. there is no way for the drone to measure AGL height.
 
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There are a few hack sites that will allow you to remove the 500 meter limit. I have done what you are looking to do for the same reason that you describe. Certainly is beneficial in mountain areas but you will need to pay attention to battery level in those areas when flying up the hills.
Firmware levels will be a part of what can be added or removed in this process. There are some DJI products that may not allow hack installation. I have not seen that the mini4 pro has made it to any hack list.
 
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The drone will hit 1640 feet in the USA. It’s crippled to 400 feet overseas.
At least in EU countries. Some non-EU countries are members of EASA, and there is some confusion whether the height limit also applies in those countries. In other words, is the max 120m at take-off point only for EU-countries, or for all EASA countries?
 
Your drone has two Height limits.
One is baked into the firmware and won't allow your drone to ho higher than 1640 feet (500 metres).
The other is a user configurable limit which you can adjust to whatever you choose (up to 1640 ft).
By default the drone comes with this set to 400 ft.

No .. there is no way for the drone to measure AGL height.
The drone can very easily measure above the ground height using GPS; it's quite accurate. If what everyone is say were true you could not sell DJI drones in mountain areas.
 
Just got the new mini 4 Pro and i was wondering if the max altitude that DJI has incorporated can be bypassed? I live in a very mountainous area and I can easily be at the max height restrictions used by DJI and still be way under the 400’ AGL the FAA requires. Is there any chance that DJI might use AGL rather than height above takeoff as a parameter?
Good explanation of drone altitude measuring: How Accurate Are Drone Altimeters? - Pilot Institute
 
The drone can very easily measure above the ground height using GPS; it's quite accurate.
No ... it cannot.
GPS has no way to tell the elevation of the ground below your drone.
If what everyone is say were true you could not sell DJI drones in mountain areas.
Whatever it is that you are suggesting here is unclear.
 
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The drone can very easily measure above the ground height using GPS; it's quite accurate. If what everyone is say were true you could not sell DJI drones in mountain areas.
Huh? I fly in Mountainous Areas 100% of the time and the aircraft has no knowledge of AGL only Height Above Takeoff Point. The UAS doesn't vary height when the ground below it changes unless it's using something like Terrain Awareness which pulls GPS DATA but you have to remember, we are talking about flying at 200' and well clear of terrain variances etc. HUGE difference between that and what you're suggesting.
Good explanation of drone altitude measuring: How Accurate Are Drone Altimeters? - Pilot Institute

Did you read the article you posted? This is but one portion copied directly from that article:
"GPS triangulation can also be used to determine the flight altitude of a drone. However, it is considered less accurate and even more prone to drifting compared to barometry."

GPS Data is good for a reference point for non-critical things but with GPS drift etc you don't want to rely on Consumer Grade GPS for anything precise.

Unless you're flying very low and the UAS is using VPS it has no DATA to know how far it is from the actual ground below. None of us would want to pay the $$ for the equipment needed to get accurate AGL sensors into our drone. To make it more complicated, it's too heavy and bulky to fit in anything remotely the size of a "consumer drone". At least for now, we are stuck with "Height Above Take Off Point".
 
The drone will hit 1640 feet in the USA. It’s crippled to 400 feet overseas.
My understanding is the 400 feet or 120m above take off point is not yet in effect in the EU and will not go into effect until 2024. And when it does go into effect, it does not apply to drones in the UK and for drone that are greater than 249g. I could be wrong....
 
Your drone has two Height limits.
One is baked into the firmware and won't allow your drone to ho higher than 1640 feet (500 metres).
The other is a user configurable limit which you can adjust to whatever you choose (up to 1640 ft).
By default the drone comes with this set to 400 ft.

No .. there is no way for the drone to measure AGL height.
My thought is that DjI with todays technology could make monitoring the AGL a thing. Maybe in a future model.
 
My thought is that DjI with todays technology could make monitoring the AGL a thing
Today's technology still isn't great if you're referring to relying on DEM data to estimate the AGL.
 
Mine will go to 1640, but in mountainous terrain it isnt enough. I could still be perfectly legal and still go higher.
If you have that kind of space and time, is it possible you can land and reset the altitude? That’s pretty high maybe you want to start a bit higher than at the base of your mountains perhaps?
 
If you have that kind of space and time, is it possible you can land and reset the altitude? That’s pretty high maybe you want to start a bit higher than at the base of your mountains perhaps?
That would work but it would require about half a day to get where the drone can go in a few minutes, very steep.
 
Today's technology still isn't great if you're referring to relying on DEM data to estimate the AGL.
Almost any airplane on the planet can tell the AGL, it would seem not terribly difficult to incorporate that into drones. But I do admit I am not very knowledgeable on this. I am so ignorant I dont even know what DEM is, lol.
 
Almost any airplane on the planet can tell the AGL, it would seem not terribly difficult to incorporate that into drones. But I do admit I am not very knowledgeable on this. I am so ignorant I dont even know what DEM is, lol.
Airplanes use radar altimeters like the one shown here.
I would like to see that mounted on a mini 4 :)

radar_altimeter.jpg
 
Almost any airplane on the planet can tell the AGL, it would seem not terribly difficult to incorporate that into drones. But I do admit I am not very knowledgeable on this. I am so ignorant I dont even know what DEM is, lol.
Most light aircraft don't have the ability to tell AGL height because a radar altimeter is expensive and not particularly necessary.
They use a barometric sensor just like your drone does.

But if you want to get a nice economical radar altimeter for your drone, here's a good deal on a secondhand unit.
With the antenna, it weighs 3 pounds and you will need to find a 28 volt power supply to run it.
 
Airplanes use radar altimeters like the one shown here.
I would like to see that mounted on a mini 4 :)

View attachment 169536
As I already stated I plead ignorance. But somehow I think a smaller one could be managed. The old computers used to take up warehouses, now a micro SD card can hold the equivalent data. But I guess that might be why drones don’t have that capability.
 

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