I have a lot of trees in the yard, but one towers over all the rest so I used the Mavic to test height and came to a height of 140 feet.  I don't trust GPS to give elevation too well, so I wonder exactly how accurate the Mavic is?  I think we need someone to test the height of a known object.  Anyone have a way to test this?

I don't trust GPS to give elevation too well, so I wonder exactly how accurate the Mavic is?

The Mavic doesn't use GPS for elevation. It only ever displays height relative to the takeoff point and uses a barometer (or VPS sensors when appropriate) for that.

DroneFlying Posted at 2017-5-29 17:56
I don't trust GPS to give elevation too well, so I wonder exactly how accurate the Mavic is?

The Mavic doesn't use GPS for elevation. It only ever displays height relative to the takeoff point and uses a barometer (or VPS sensors when appropriate) for that.

I was unaware that it had an actual barometer.  Way cool.  So my tree is 140 feet high!

Hi.

The height you see on the screen is very accurate. Has a very accurate rangefinder and has before measured altitude (distance) that fits within 1 meter when my mavic hover directly over me at a height of 60 meters. You must keep in mind the height is always based on your take off point.

The height of Mavic is calculated from the barometer when the vessel is over 15 meters in height. GPS is only used to determine the position of the vessel on the map.

Regards Leif.

Landbo Posted at 2017-5-29 23:59
Hi.

The height you see on the screen is very accurate. Has a very accurate rangefinder and has before measured altitude (distance) that fits within 1 meter when my mavic hover directly over me at a height of 60 meters. You must keep in mind the height is always based on your take off point.

I'm late to this party but how does it know when it is at 15 meters? To be able to take barometric pressure.

Andreas Wederbrand Posted at 7-28 01:46
I'm late to this party but how does it know when it is at 15 meters? To be able to take barometric pressure.

Ignore the post that's confused you.
The barometer measures altitude from the time the drone is switched on ...  not from 15 metres.

You can measure and compare an object's shadow with the shadow of a known object to determine it's height. You need a tape measure and a yard stick. Stand the yard stick exactly vertical and measure it's shadow. Then quickly before the sun moves, measure the shadow of the tree. The ratio you got for the known objects height is the same as the unknown object's ratio. For example, say the 3 foot yard stick's shadow was 2 feet, and the tree's shadow was 50 feet. 50X3/2=75. The tree is 75 feet tall. If you do it, let me know how accurate your Mavic was.

TrevorSK Posted at 7-28 05:44
You can measure and compare an object's shadow with the shadow of a known object to determine it's height. You need a tape measure and a yard stick. Stand the yard stick exactly vertical and measure it's shadow. Then quickly before the sun moves, measure the shadow of the tree. The ratio you got for the known objects height is the same as the unknown object's ratio. For example, say the 3 foot yard stick's shadow was 2 feet, and the tree's shadow was 50 feet. 50X3/2=75. The tree is 75 feet tall. If you do it, let me know how accurate your Mavic was.

If you do it, let me know how accurate your Mavic was.
Don't expect a reply.
That post was 3 years ago.

Labroides Posted at 7-28 05:47
If you do it, let me know how accurate your Mavic was.
Don't expect a reply.
That post was 3 years ago.