RTK Test with Recorded point with RS2 and Drone on top of point

[jmason702]

150' AGL, 102 photos, 6 MPH, 80/75 overlap, All fixed solutions Home Test - Google Drive

 

[jmason702]

More

 

[jmason702]

Can not get camera options to stay in manual during missions...?

 

[jmason702]

Here is the DD report, no GCPs, and no checks... Since we have already proven the drone to be quite accurate on its own. But this report is by far the best I have ever seen!!! LOL
DD report and Metashape Error side by side.

 

[jmason702]

150' AGL, 102 photos, 6 MPH, 80/75 overlap, All fixed solutions Home Test - Google Drive

Z vertical, RS2 is saying 716.994, Drone is saying on same point 717.066 meters. That's a 2.834-inch difference, with makes sense cause the drone's antenna sits hight than the point recorded. see attached,
Not sure where the drone's antenna centerline is exactly.

 

[jmason702]

Re processed and got the same results... wonder if it is that accurate... I did make a change to the RS2 in base mode before the project

 

[Dave Pitman]

Not sure where the drone's antenna centerline is exactly.

The RS2 (or any survey gnss gear) takes the phase center of the antenna and subtracts the distance of the housing. You input your rover pole height and it subtracts that as well in order to tell you what the coordinate is of the point ON THE GROUND, not the antenna's coordinate.
Similarly, the coordinate written to the image exif should be the camera sensor's position, not the antenna. Without measuring, I'm guessing the center of the evo's sensor is probably closer to 1.5 - 1.75 inches above the ground. If your offsets are correct in the RS2, that is the vertical difference you should get in a perfect world...I think ! If Autel is writing the antenna's coordinate to the image exif, that is an incorrect proceedure. The processing software will not be accounting for the differential between the antenna height and the center of the camera sensor. In fact, with a drone, the height, direction and angle between the antenna and the sensor should all be accounted for when correcting the xyz position from the antenna to the sensor.

 

[jmason702]

Yes, my survey point is a 2-meter pole. Then witch should put me at the exact CenterPoint on the ground. I have it set to that perimeter... The drone was set directly over the center of target

 

[Dave Pitman]

If you have access to a known point, a reputable monument of some sort, I would set up on that with a FIX solution on the drone directly from the NTRIP network, and see what you get. You should be able to find a list of monuments in your state.

 

[jaja6009]

Your tests have me close to buying a Evo 2 Enterprise kit along with an RTK module. Keep up the great work!

 

[jmason702]

Your tests have me close to buying a Evo 2 Enterprise kit along with an RTK module. Keep up the great work!

Thank you Sir!

 

[jmason702]

another test at home... This time 200' AGL, 7MPH, 80/70 overlap, no wind, sunny, and still in auto camera with fixed ISO. I can NOT figure out how to map with manual camera settings...

meta shape and DD attached, also the file with one point recorded, if anyone would like to process... only 85 photos

test 1 - Google Drive

drive.google.com

 

[jmason702]

Somehow, I accidentally removed the work area in Meta shape, which also has your photos by point or marker. Not sure how to get it back?

Screenshot attached, also realigned photos

 

[Dave Pitman]

Somehow, I accidentally removed the work area in Meta shape, which also has your photos by point or marker. Not sure how to get it back?

Screenshot attached, also realigned photos

File menu , VIEW > PHOTOS

 

[jmason702]

THANK YOU

 

[Dave Pitman]

Glad to help if I can !

 

[jmason702]

With Point and update

 

[Dave Pitman]

Jeff, your MS metrics are showing that the camera positions are over 3 times more accurate than Marker 2. Is that your intention?

 

[jmason702]

using the weighting protocol that I saw on here. let me double-check that

 

[jmason702]

here is what I used