Analysis of rolling shutter options

[Gordon]

@jstroup

how to calculate the relationships between shutter speed, GSD, and ground speed.

Incomplete Orthomosaic

During a recent big job under varying lighting conditions I spent a lot of time adjusting shutter speeds, aperture and ISO to avoid motion blur, having to do mental calculations whilst walking over rocky, rough ground and keeping my eye on the drone. So I’ve grabbed an envelope, turned it over and found that for a given GSD the general equation is shutter speed needs to be close to, or shorter than speed in m/s * 100 /GSD. speed in km/hr * 28/GSD speed in mph * 45/GSD For example @ 40km/hr…

[smathermather]

Once of my favorite analyses on this forum… .

[jstroup]

This is the article I remember reading on this topic:

[kikislater]

Interesting reading !
So according to your measures, the second process seems ok. But number of gcp vs control point are not enough to make a conclusion.
The mavic 2 pro was the ugliest drone I had to make survey ! Sometimes results were not satisfying, totally different from p4p which has mechanical shutter.

[jstroup]

The Mavic 2 Pro has certainly been an interesting camera to figure out.

For example, using Pix4D, I discovered I needed to use this option to show a good calibration in the Quality Report.

I haven’t dug too far into the WebODM camera calibration options and reports - but I wouldn’t be surprised some adjustments are necessary for this drone’s camera.

I’m coming from the ArduPilot world where my quad-copters are carrying Sony Alpha series cameras. I’ve decided to dig into DJI products to just have another tool in my tool box. I chose the Mavic 2 Pro because it supports missions - and is a better drone than the Phantom. It does however, lack the Phantom’s mechanical shutter.

If I decide to go deeper into the DJI world, I may buy a Mavic 3 Enterprise. But it was less expensive to start with a used Mavic 2 Pro - and I think it’s always good to know a bit about the history of things.

Thanks!