AI6YR BenDec 16
Oh wow, photos of the damage from the M7.0 earthquake in Alaska (originally Yukon Geological Survey on FB, via Dan Shugar). #earthquake #Alaska #landslide
Show threadAI6YR BenDec 16
Sentinel-1 before/after (in 3D) of that last one... Which I pulled off Copernicus a second ago. Wow! #MountKingGeorge #MtKingGeorge #geology #landslide #earthquake #RemoteImaging
Show threadAI6YR BenDec 16
This could be a synthetic aperture radar artifact, but at the base of that landslide is a strange topology anomaly. 🤔
Show threadAI6YR BenDec 16
Hmm, what funky object is radar reflective in a weird way on an ice sheet? Ice itself? Ground down granite? So many odds things out there, LOL.
Show threadAI6YR BenDec 16
Oooh, the second one, the strange ring, is this. I wonder if that's volcanic? There appears to be a lot of dust stuck to the walls of the snow around that structure, which is causing those reflections. 🤷 #mystery #geology
Show threadAI6YR BenDec 16

This one looks like there's a door in it 🤪

Secret villain lair?

Spaceship?

(probably the top of a buried mountain 😉 )

For the record, 60.4893, -139.9348

#mystery

Show threadAI6YR BenDec 16
Oooh, it's VERY radar reflective. Whatever it is. Super secret Canadian military base encased in a glacier? 🤪
Show threadFreddyB Aviation PhotographyDec 16

@ai6yr We find stuff like this a lot out in BF Nowhere and some of it is specific to the use of SAR and they use them to monitor movement etc

Integration of Corner Reflectors for the Monitoring of Mountain Glacier Areas with Sentinel-1 Time Series
https://www.mdpi.com/2072-4292/11/8/988

Show threadAI6YR Ben
@cvvhrn Oooh, corner reflector on a glacier to monitor movement... that *WOULD* explain that strange signature!
Dec 16 at 3:59amWeb
Show threadFreddyB Aviation PhotographyDec 16
@ai6yr You also get weird stuff like this and its almost always in the boundaries of of a military or restricted area (Edwards) which are calibration marks for satellite and airborne optical systems
Show threadT. J. BombadilDec 16
@cvvhrn @ai6yr Here’s another one. https://maps.app.goo.gl/h29RT9amLFB11EM37?g_st=ipc
Bevor Sie zu Google Maps weitergehen

Show threadMatthew DockreyDec 16
@cvvhrn @ai6yr Amusingly, the calibration targets for optical measuring systems look exactly like that, just on a glass slide with the largest square only 10mm across.
Show threadmidendianDec 16
@attoparsec @cvvhrn @ai6yr indeed they are both called “USAF target” regardless of scale!