Round concrete silos not showing - thoughts?

I recently flew a few old concrete silos that are connected by a metal walkway at the top. The overall stitched aerial came out great except for the silos (blurred) which main focal point of interest. The silos also didn't show in the 3D files (DEM), preview. I the silos twice (once around 200' and the second around 160') to compare resolution, but both had the same results with the silos. Any thoughts? Here is the public map and the silos near the center (shadows). Thanks.

https://www.mapsmadeeasy.com/maps/public/84feec61d93a47508fbd9d32cd5d890b/

Mark A October 15, 2015 01:34

Official comment

Please refer to the section about flying around tall objects:
https://www.mapsmadeeasy.com/data_collection

It looks like you had pretty minimal overlap. 60% or so. That is fine if you are mapping a very flat area, but as soon as you put any vertical features in there, you need more overlap.

Basically, tall objects get less overlap for us to do our calculations on than everything else does and can make certain features not render well. When in doubt, use more overlap or fly higher to make the the effect of the height ratio less obvious.

Tudor October 15, 2015 17:34

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3 comments

One issue I have noticed even before having access to this app and software is that certain objects like metal roof tops do not process well even if you have perfect lighting. The reason is due to the underlying algorithm and the need to recognize similar pixels between images. Another tip might be to try flying on a cloudy day as you will get a much flater lighter (no shadow) and shouldn't get any of the shine which can play havoc with the algorithms.

Alex Bilyk October 16, 2015 03:29 1 vote

Sorry for the delayed response. Thanks for the information and the link to the section with details on mapping tall objects. I wasn't sure if it was the round silo that was giving me the problem. I'm going back down to soon to fly again

Mark A October 23, 2015 12:19 0 votes