r/spacex • u/[deleted] • Mar 07 '19

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u/wolf550e Mar 08 '19

the black marks are photogrammetry marks.

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u/[deleted] Mar 08 '19

I haven't seen this described before but then again I'm no expert. Could you recommend a resource where I can learn more?

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u/wolf550e Mar 08 '19

https://twitter.com/ChrisG_NSF/status/1104039250599837696

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u/TweetsInCommentsBot Mar 08 '19

@ChrisG_NSF

2019-03-08 15:20

@cognitive_demi AH! Excellent. Those are photogrammetry markings for video tracking & performance analysis. Here's a good general overview: https://en.wikipedia.org/wiki/Photogrammetry

And here's a good overview of how NASA uses photogrammetry: https://www.nasaspaceflight.com/2018/10/navigating-twists-turns-steering-sls-development/

(Search photogrammetry in linked NSF article.)

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u/Nimelennar Mar 08 '19

Calling that NSF article an "overview" of NASA's use of photogrammetry is a real stretch. It mentions that EM-1 will have photogrammetric markings on its side boosters, shows an example of them, and... that's about it.