Dynamically Set Mission Parameters Questions?
Hello,
I've noticed some mission Component parameters are dynamically set and are different from those manually set by the mission planner.
Specifically, in a mapping Component I've set max speed to 20 mph, but that is changed to a lower value (3.6 mph) in the Mission Preview tile. Interestingly, If I then specify a different Drone (or even a different AGL) the Mission Preview shows a different max speed value. Is this max speed parameter a setting made dynamically to preserve GSD resolution? How and why is the max speed being determined differently from the mission setting? (for example - is it including or assuming a shutter speed setting and setting a max speed based on this assumption? What are all the parameters used to dynamically determine this speed - Drone, Altitude, etc.?
Lastly, what is the "AC" value show in the mapping mission? It seems to vary with altitude only, not drone selection.
See Screenshot below.
Comments
6 comments
I've always taken it as the max speed of 20 MPH, is the maximum speed the drone will be allowed to fly at, whereas the the max speed of 4.6 is the actual maximum speed the drone will reach during the mission, and will depend on the maximum leg length, as it has to accelerate and decelerate coming out, and going in to the turns
I searched and found this thread about how max speed works on mapping which may help. The ac is the size of map in acres.
https://support.dronelink.com/hc/en-us/community/posts/360052936593-Speed-max-setting
Thank you both (Martin and Mike)... Seems logical. It would also be important to know if the max speed algorithm is designed to ensure GSD resolution is maintained. However, it would have to make an assumption about shutter speed (which is highly variable depending on lighting conditions). Maybe Jim can weigh in. Happy New year to all!
https://support.dronelink.com/hc/en-us/community/posts/13569657512723/comments/13572728569491
Thanks Jim.
Nice work!
So do we still need to compute GSD and further limit speed to keep pixel smear within GSD resolution?
Or can we rely on the algorithm to keep us within GSD resolution generally speaking?
Thanks,
Daniel
GSD, "pixel smear" and speed are all different things.
GSD - ground sampling distance is based on altitude.
"Pixel smear" is based on capture speed, sensor and other factors such as a mechanical shutter. If you have a fast shutter speed, fast camera, are high up with a mechanical shutter you can go pretty fast and the picture will not blur. If you did the same mission in low light the picture would blur because the shutter speed is too slow.
The speed being set is to allow the camera to take pictures at the rate set. For example, if you are taking pictures every 2 seconds, and are flying 20ft above what you are trying to capture, the drone will have to slow down a lot to maintain the same overlap. It has nothing to do with blurry photos - although if it does slow it down to maintain the overlap, then you are less likely to have blurry photos.
Hope that helps.
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