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Author Topic: Dead Spots in DENSE CLOUD, pls HELP!  (Read 603 times)

keyable

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Dead Spots in DENSE CLOUD, pls HELP!
« on: February 10, 2018, 01:22:16 PM »
Hello!

Currently I am working at big project. I have few problems, first when I Aligned Photos at Highest settings it only aligned 39/97. After several tries with THE SAME settings now I got 94/97 aligned photos. As you can see not all of them were aligned. After this process I created Dense Cloud at High settings, BUT there are dead spots under cameras (It wasn't taken into account) what is the problem? THANKS!

Please see attachment

Erik Holmlund

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Re: Dead Spots in DENSE CLOUD, pls HELP!
« Reply #1 on: February 10, 2018, 02:29:03 PM »
Hi,
What are your camera reprojection errors? If they're high, you most likely still have an alignment issue which could be the cause of your incomplete dense cloud. You could try varying the key and tie point limits to try and fix it, as well as add manual tie points (markers) to improve the alignment.

There seems to be a lot of vegetation where you survey. I'd suggest a higher overlap (more images) next time, as vegetation is hard for matching algorithms. Also including oblique imagery has anecdotally proven successful for me in terms of vegetated areas.

I also often have issues with my region cropping the dense cloud output, due to it being too small. I see that the horizontal extent seems good, but could the region be cropping it height-wise?

Hope it helps.

keyable

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Re: Dead Spots in DENSE CLOUD, pls HELP!
« Reply #2 on: February 10, 2018, 07:53:59 PM »
Thanks for reply!

I tried increasing points from 40.000 to 60.000 and ties from 4.000 to 6.000, the result were the same :\ any other suggestions? :(

I tried with different Software and worked fine, I just want to use Photoscan.

Cheers!  8)