These are the results of a flight I attempted using UgCS in an attempt to get more familiar with the software. The flight parameters were set to 85 front and side overlap with an altitude of 103 ft. The camera trigger function was set to Auto by distance and action on forward passes only. As you can see the consistency leaves much to be desired. Can't say I am happy with the results after spending the money on ONE license.  

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Hi Nathan,

Thanks for your effort to analyze the photogrammetry results!

We would be thankful if you could send us your route or mission file to investigate and improve the functionality.

Please send them to support@ugcs.com.

Also the new UgCS for DJI App version, that will be released shortly, will improve camera triggering precision.

Artūrs

What UAV did you use?

Sorry should have mentioned, was using the phantom 4 



Artūrs said:

hEY Arturs, can you shoot me the procedure for downloading the log? I will be happy to send you any info on the flight depicted above. I only could read half of your reply though. Can you please repost it? 

There seems to be some bug on the forum going on.

It should be enough if you attach the route export or mission export and send it to support@ugcs.com.

Please see here how to export route/mission: https://www.ugcs.com/en/page/support

I experienced this recently with the Phantom 4 Pro using both UGCS and the DJI GS Pro.  For UGCS I was using the trigger by time option and I was shooting RAW.  I suspect the camera cannot write the raw file to memory card fast enough (e.g. 2 hz), I don't know if that's a hardware problem or if a higher quality SD card would have resolved the issue.  For your specific case I will mention that I have tested distance and time-based intervalometers over the past 4 years and what I've found is that time-based intervalometers typically take too many images and distance-based intervalometers take too few.  It comes down to the fact that single frequency GPS is being used to estimate horizontal velocity. 

Nathan Harpster said:

Sorry should have mentioned, was using the phantom 4 

Jonathan,

I'm interested in what the Phantom 4 Pro is capable of doing, compared to the Inspire 1 Pro which I own. I am currently limited to about 6m/s with the Inspire because the shutter can't be triggered any faster than once every five seconds via software. Manually, it can fire as quickly as once every 1.5 seconds, but that's another story...

I think the P4P can fire faster, and therefore, can fly missions faster as well. Plus, I think the battery lasts closer to 30 minutes vs. 15 with the TB47 on the Inspire. Overall, it seems to have the potential to be a better vehicle for large surveys than the Inspire. Have you found this to be the case? Any details you can provide would be really welcome.

Regarding overlap, I've been shooting 60%/60%, but have had a few stitches recently that had some blank spots due to insufficient images. I'm going to move up to 75%/75% overlap which should help, but will also further slow down the Inspire and make these large surveys take even longer.

Thanks,

Mark

If shooting RAW then the trigger time is 5 seconds for jpeg it's 2 seconds.

I do 85% front X 70% side overlap and it works well with Agisoft PS Pro.

Mark Fink said:

Jonathan,

I'm interested in what the Phantom 4 Pro is capable of doing, compared to the Inspire 1 Pro which I own. I am currently limited to about 6m/s with the Inspire because the shutter can't be triggered any faster than once every five seconds via software. Manually, it can fire as quickly as once every 1.5 seconds, but that's another story...

I think the P4P can fire faster, and therefore, can fly missions faster as well. Plus, I think the battery lasts closer to 30 minutes vs. 15 with the TB47 on the Inspire. Overall, it seems to have the potential to be a better vehicle for large surveys than the Inspire. Have you found this to be the case? Any details you can provide would be really welcome.

Regarding overlap, I've been shooting 60%/60%, but have had a few stitches recently that had some blank spots due to insufficient images. I'm going to move up to 75%/75% overlap which should help, but will also further slow down the Inspire and make these large surveys take even longer.

Thanks,

Mark

Hi Curtis,

Thanks for the information. One more reason to seriously consider the Phantom 4 Pro.

Mark

I concur with Curtis' findings on the imaging intervals. I usually do 80%/80% unless I'm over an area with a lot of topographic variation, then I move up to 85%/80%.  However, UGCS follows the terrain reasonably well so adjusting overlap may not be necessary unless the area is forested.  I've never seen 30 minutes with the P4P except in a hover but I frequently fly 18 - 22 minute missions without issue.  

That's disappointing to hear about the flying time. I was really hoping for closer to 30 minutes. I know someone who can get their hands on an evaluation P4P in a couple weeks. I'll do some testing and get back to the group with the results. Thanks again for your input!

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