Meta4
Premium Pilot
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I'm not sure where you are getting those numbers.When I open the exif of the ohantom photo, the absolute height is 218.71 and relative 28.4. how did you find the 31.5
I'm not sure where you are getting those numbers.When I open the exif of the ohantom photo, the absolute height is 218.71 and relative 28.4. how did you find the 31.5
Meta4 these are from my Phantom 4 Pro V2. I think when he triple posted he might of thought he posted his own Phantom 4 image.I'm not sure where you are getting those numbers.
When I imported the Matrice image into Agisoft it did not ignore the Absolute elevation.There are two altitude numbers in the metadata for each image file.
The Relative Altitude is the number you see on screen while flying.
Absolute height is the inaccurate approximation of height above sea level.
Agisoft only uses the relative height and completely ignores the absolute height numbers.
The metadata for those two files shows:
P4 pro
Absolute height 31.5
Relative height 56.2
M300
Absolute height 344.5
Relative height 104.2
That's a difference of approx 50 metres (not 120 m).
Were the drones flying at 56 m (P4 pro) and 104 m (M300), like the data indicates?
If you were to fly the drones at the same height, does Agisoft have any problem working with the image files?
Sorry .. I was confused by two people posting photos and forgot who was the OP.Hello guys, does anyone have an experience with the height difference in coordinates between m300 and Phantom 4 pro? We have automaticly flight mission with UGCS and m300 for orthos and grids. We use the phantom 4 pro v2 for more detailed pictures for 3D reconstructions. But the photos from m300 has always difference in height more than 120 meters against the phantom 4 pro and the result cant link together in agisoft. Because the m300 photos are in correct positions, but the Phantom photos are somewhere under ground. Does anyone have some idea how to fix it? Or what should we change in our workflow? Thx for you reply.
Drone | Set Altitude (ft) | Set Altitude (m) | Rel Altitude | Absolute Altitude | GPS Altitude |
Mavic 2 Enterprise Advanced | 177 | 53.95 | 53.85 | 28.17 | 28.1 |
Mavic 2 Enterprise | 210 | 64 | 63.9 | 67.67 | 67 |
Phantom 4 Pro V2 | 182 | 55.47 | 56.2 | 31.53 | 31.5 |
Ellipsoid height in area = -32 | |||||
Geoid Height in area= -34 | |||||
H = h - n | |||||
Orthometric Height = Ellipsoid height - Geoid Height | |||||
2m average Orthometric height in area |
sUAS | X | Y | Z | Total |
Phantom 4 RTK Double Grid (Oblique 60*) | 0.77 cm | 0.50 cm | 1.71 cm | 1.94 cm |
Phantom 4 RTK Single Grid (1 Diagonal Line Oblique) No GCPs | 0.66 cm | 0.50 cm | 3.08 cm | 3.19 cm |
Phantom 4 Pro V2 PPK | 2.11 cm | 1.41 cm | 10.67 cm | 10.97 cm |
Anafi Thermal | 0.36 m | 1.85 m | 0.34 m | 1.92 m |
Mavic 2 Enterprise (Zoom) | 1.51 m | 1.51 m | 0.74 m | 2.26 m |
Phantom 4 Pro V2 | 0.21 m | 3.23 m | 4.20 m | 5.30 m |
Mavic 2 Enterprise Adv. | 4.38 m | 0.86 m | 4.52 m | 6.35 m |
It will be correct for the Phantom 4 pro V2 as well.I found this to be spot on except for my Phantom 4 Pro V2.
You need to forget the Absolute Altitude number shown in metadata.Absolute Altitude was 28.17m. There is no way possible this is referring to Above Sea Level.
It will be correct for the Phantom 4 pro V2 as well.
You need to forget the Absolute Altitude number shown in metadata.
It's junk and completely useless.
And don't be confused by DJI labelling the data field as GPS altitude - it does not come from GPS.
It's calculated with a very poor algorithm that assumes atmospheric pressure at sea level is a constant (but it's not).
It's commonly out by +/- 200 feet or more.
If you do a little testing you'll find that the same drone will give very different Absolute Altitude numbers flying in the same place on different days.
Don't try to make sense of the number for Absolute Altitude because it's useless junk.
Just ignore it.
Here are a couple of examples from the same drone in the same area on different days:
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