Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
It's not a thing. It will be a thing.

idea: add, search, annotate, link, view, overview, recent, by name, random

meta: news, help, about, links, report a problem

account: browse anonymously, or get an account and write.



Distress pattern signals imaging satellites

Draw a geometric pattern on the ground to signal distress to imaging satellites
  [vote for,

Many people, particularly those which may be in a dangerous situation, are familiar with the Morse code for SOS. I’m not, but it’d probably be on my reading list before taking a three-hour tour. And it’s not even that useful for signaling distress, requiring a functioning emitter and a nearby eavesdropping receiver.

Instead, we need a pattern that is easily learned and reproduced, most likely using a dozen or so points, some equidistant to another, to create a shape that can be represented on the earth’s surface with contrast. It will be unique enough to exist very infrequently by chance, but generic enough to be memorable even for children.

The pattern should be reproducible at any scale with only a fixed-length measuring device and the ability to alter the landscape’s contrast, whether by drawing, carving, holes, or placing rocks or manmade objects. Think of the grade school pointy S as an ideal balance of simple to remember yet geometrically complex. Sadly, it’s origination without an emergency context makes it an inappropriate choice and potentially widespread in aerially-viewed graffiti. Perhaps another letter, symbol, or icon in the same style?

The ability to pick such a pattern out of satellite imagery already exists. The EURion constellation is used worldwide in banknotes to prevent reproduction and its search invoked with nearly every photocopy made. A known distance and orientation of points is sufficient for modern image processing software to pick it out of the noisiest backgrounds with trivial computing power.

Human review for false positives would be the easy part. Response to prank or artistic depiction eliciting rescue are up to the bounding government’s policies but would likely consume fewer resources than driving out to the sites of hundreds of 911 butt-dials.

As satellite imagery is updated at an increasing rate by both governments and corporations, the viability of passively searching as it’s released and still managing to find survivors increases. Going by the recency of Google Maps images of my area, Wilson would’ve still been no more than a volleyball to Tom Hanks by the time he was scooped up.

Lucent, Nov 16 2016


       I think you're overestimating the percentage of the world that is viewed by satellites, their visual acuity and the amount of attention given to their imagery in most areas. I think you're underestimating the computational cost of this program. [+]
Voice, Nov 16 2016

       [+] but, like [Voice], I doubt that satellite coverage or realtime image analysis is good enough to make this useful at the moment.
MaxwellBuchanan, Nov 16 2016


back: main index

business  computer  culture  fashion  food  halfbakery  home  other  product  public  science  sport  vehicle