Recent Posts

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CAD / Re: Draw arcs
« Last post by vid.peterman on March 23, 2023, 12:16:45 PM »
Hi Ivan, not yet, but Upgrade to our CAD engine is on the development plan.
Bundle Adjustment / Re: Reprojection error
« Last post by vid.peterman on March 22, 2023, 02:47:12 PM »
Hey Jay,

Which drone do you use and which geoid model? Which coordiante system?

If you upload your photos and gcp file here:

I will process the dataset and check what the issue is?
Bundle Adjustment / Re: Reprojection error
« Last post by jay.currie on March 21, 2023, 04:08:05 PM »
I understand that it's within tolerance, however, I'm getting elevation errors around 1 ft. consistently over the entire site. The odd thing is that I used the Carlson Photocapture software with the exact same data set and had a lower reprojection error and had zero elevation errors over .24. Something has happened to either my version of 3d, or the software hasn't kept up with the updates that DJI has provided to the Mavic line of drones.
Bundle Adjustment / Re: Reprojection error
« Last post by markom.mesaric on March 20, 2023, 02:31:06 PM »
Hi Jay,

With Mavic 3E we get reprojection error in exactly same range. This is expected and reprojection error of less the 1 pixel is good, because the tiepoints are detected with an accuracy of about 1 pixel. I would worry if reprojection error would be higher then 1.5 pixel or if it was maybe 2 pixels for your drone.
Bundle Adjustment / Reprojection error
« Last post by jay.currie on March 17, 2023, 09:27:30 PM »
After bundle adjustment I am getting .65 to .89 reprojection error. This is not acceptable. I'm flying a Mavic 3e. Is anyone else getting this error? I believe it is a drone issue, as they updated the selection process for the main camera and it hasn't worked correctly  since. I've sent in files to 3d survey and they cant find any issue. Right now I have a really nice paper weight of a drone as none of the info is reliable in the least.
Mission planning / Re: How to take control in an emergency during a mission?
« Last post by to.flo on March 08, 2023, 09:14:07 AM »
Hello Marko,
thank you for your fast answer :).
I will try that procedure on my next flight. The cancellation of the mission doesn't matter if i can react immediately.

Workflows / Re: Classification Settings
« Last post by markom.mesaric on March 06, 2023, 11:00:45 AM »

Terrain elevation and terrain slope - these two parameters govern the first step of classification. This is a greedy algorithm. It keeps adding points, after you select the first one, as long as the height difference between first and neighboring point is less then Terrain elevation parameter and angle between first and second point is less then Terrain slope. So in short - increasing these two parameters will increase the size of area that is selected after you click on a point in 1st step of classification.

Then algorithm makes a digital terrain model (regular grid mesh ) out of the selected points. Regular grid mesh cell size and smoothing factor govern this algorithm. Here we would increase the regular grid mesh size, if our area was very big - more then 1km by 1 km.

Then final part of point filtering - for each point in pointcloud algorithm checks it in relation to this digital terrain model. If the point is less then "Smoothing max distance" above the digital terrain model and less then three times "Smoothing max distance" below the digital terrain mode, it gets added to final selection.
Mission planning / Re: How to take control in an emergency during a mission?
« Last post by markom.mesaric on March 06, 2023, 10:14:15 AM »

the fastest way to take control over the drone is to cancel the mission by moving switch from P mode to S and back to P mode. Then you can use your RC sticks to control the drone.
Unfortunately with this procedure you lose the possibility to continue the mission from the last point.

Best, Marko
Workflows / Classification Settings
« Last post by steve.belz on March 04, 2023, 08:42:51 PM »
Is there any documentation on what the new ver 2.16 Classification settings do and/or how they affect the results?  I get good results but would like to better understand the process that goes on.  I'd previously been using Cloud Compare but find that 3Dsurvey's new features to work well to give me bare ground; especially now that I don't have to export the point clouds to Cloud Compare for processing and then import back into 3DS for further processing.  Thanks for adding the new processing features!
Mission planning / How to take control in an emergency during a mission?
« Last post by to.flo on March 03, 2023, 03:44:43 PM »
can anybody tell me, if and how I can take control of my drone in an emergency case during a mission?

I made a test-flight-Mission with my P4P and was wondering what to do in case of emergency e.g. an helicopter or bird is crossing. My P4P didn't react on lowering the height or changing the flight direction.
The only possible thing I could do is abort the mission and RTH. But this takes way too long if I have to react immediately!!!

Thanks in advance.

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