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map alignment, not all photos used

Flew a mission with the Air 2s yesterday, all went well, grid pattern.  downloaded over 300 photos but the alignment is out and it looks like a large number of photos havent been used!  i was stood at the bottom left of the area and all the photos near me were good as was the overlap, those further away are not good or havent been used.  do i need to stand in the middle?

Andrew Callaghan

Official comment


Right above that image in your Map Detail page there is a link that says "What is this?". 

That link goes to a description of what the overlap report is:

In there is says:

"A red dot at an imaging location denotes that there was an image that was processed but it did not have sufficient overlap and/or matchable features so it was not included in the output."

This means that we got and processed all of the images you uploaded but were unable to include them due to feature matching issues. 

Where you stood doesn't have anything to do with it since the data was all collected without gaps. 

It looks like the issue here is that you had a pretty decent sunspot in your imagery. All of your imagery was taken at exactly solar noon which put a bright spot in each of your images. This moving bright spot constitutes "motion" as far as the feature matching algorithm is concerned. It can't match things that don't look the same between looks at it. This is covered in the Data Collection guidelines that are agreed to at the time of upload.

We will grant a one-time 50% refund for sunspot related issues. Please be sure to collect your data at least 1.5-2 hours before or after solar noon for your area. 

There really isn't much reason to run a full grid here. 80/80 overlap in a normal grid would usually be plenty for this type of scene. It might be worth uploading half of the data to see if it turns out better. Sometimes too much data that is conflicting is worse than less data. 

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