Planes Landing in Beijing: Video from Space

https://www.mapbox.com/blog/video-of-beijing-from-space/

by bsudekum • 12 years ago

278 66 12 years ago

That is pretty awesome. I would be very interested in limits of modern reconnaissance hardware in orbit, if commercial microsats can produce video with clearly visible cars.

wmeredith• 12 years ago

Well, in 1985 US Spy satellites (declassified in 2011) had a resolution of 2-3 feet[1]. "Keyhole-class" (KH) reconnaissance satellites have been orbiting the Earth for more than 30 years and reportedly have a resolution of 5-6 inches[2].

[1]http://news.yahoo.com/declassified-us-spy-satellites-reveal-...

[2]http://science.howstuffworks.com/question529.htm

TrainedMonkey2• 12 years ago

That is precisely why I mentioned modern, in particular would be interesting to know if given a good angle they can resolve phone number being entered on a cell phone with physical keyboard (nokia 3390 for example).

antonius• 12 years ago

Site is down for me. Any mirrors?

maxden• 12 years ago

The video from the page is this: https://player.vimeo.com/video/88122560

and says its from Skybox’s SkySat-1.

jdelsman• 12 years ago

Wonder if this can be used over Ukraine/Crimea?

vesinisa• 12 years ago

I am pretty certain that's exactly what CIA is doing right now, but using their own spy satellite constellation.

bsherrill• 12 years ago

Google Maps 2.0

anigbrowl2• 12 years ago

We're still flying U-2s, which, along with certain drones, are far better observation platforms for real-time needs.

branchan• 12 years ago

Yes.

http://www.nytimes.com/interactive/2014/02/18/world/europe/k...

mladenkovacevic• 12 years ago

Oh I have a feeling they can do even better than that.

tokenadult• 12 years ago

There are some hard, unforgiving physical limits on resolution of photographs from orbit, even with digital correction of the images. For one thing, the camera is necessarily far away, and moving fast at the same time.[1] I was able to follow the specific link just kindly submitted here, which of course shows a rather large object (a commercial airliner). The satellite company's image gallery[2] compares quite favorably in resolution to an earlier company's image gallery we discussed here on HN about three years ago. But it will be quite a while--perhaps never--before some of the statements about satellite imagery that were already being made for propaganda purposes in the 1960s will be anything close to reality, even for classified military intelligence satellites. We won't be reading people's mobile phone screens from orbit ever, probably. Unmanned drone aircraft are at nearer distance and travel at slower speed, and provide a much better platform than earth-orbiting satellites for high-resolution spying.

[1] http://books.google.com/books?id=6DBnS2g-KrQC&pg=PA204&lpg=P...

http://www.kmc63.com/phy1000/worksheet-licenseplates.pdf

[2] http://www.firstimagery.skybox.com/

claar• 12 years ago

We've been overcoming hard, unforgiving physical limits for ages.

The obvious solution in this case is to combine images from multiple satellites, ala http://en.wikipedia.org/wiki/Very_Large_Telescope

mturmon• 12 years ago

Yes. It would be unwise to assume that space-based optical interferometry is not currently being done.

bane2• 12 years ago

The first link you provided also brings up several interesting implications about continuous surveillance from space. The first is that it is technically possible, but economically difficult. Getting ~5000 high resolution satellites in LEO is not really all that much more difficult than getting 1, it's a matter of scale. But getting funding to put that number up is virtually impossible. Even smallsats and other swarm approaches lack the physical space for the sensors (which is limited by physics, not technology). This is why air breathing drones are becoming so important. Make no mistake, NASA continuous aircraft programs like Helios have ready applications in surveillance. And from those heights, the sensors don't have to be nearly as large as on an LEO bird.

The second is that receiving data from that many birds is problematic. There are only so many receiving stations and only so much EM bandwidth available for communication and recovery of the images. Even switching to drones doesn't solve the problem. Even as of last year bandwidth was a limiting factor for the number of drones up in the air at once. [1] So now we have two problems, getting birds in the air, and we still have the bandwidth problem for downlink.

Finally, analyzing that much imagery is nearly impossible. Automated algorithms help some with certain tasks, but storage, processing, accessing, then analyzing all of that on a continuous basis is pretty much impossible. So even if getting enough sensors deployed is solved, and getting bandwidth is solved, it doesn't mean there's enough people to physically look at and interpret the results anyway. And storing all that for later instantaneous on-demand retrieval is still a problem nobody's really solved.

1 - http://www.defensenews.com/article/20130331/DEFFEAT02/303310...

JoeAltmaier2• 12 years ago

Bandwidth issues are alleviated by directional antennae, right?

mxfh• 12 years ago

The Skybox link has 2 great videos (footage is mostly the same, one is edited with "need more crosshairs"), for those who haven't seen them yet.

http://www.firstimagery.skybox.com/hd-video/2014/2/11/lookin...

youtube/ vimeo direct:

http://www.youtube.com/watch?v=fCrB1t8MncY&hd=1 https://vimeo.com/82644547

http://www.youtube.com/watch?v=BsW6IGc4tt0&hd=1 https://vimeo.com/86196806

arepb• 12 years ago

You should be able to see Sean Miller on that northern Africa encampment pretty easily now.

arethuza• 12 years ago

In case anyone is wondering - this appears to be reference to this scene from Patriot Games:

http://www.youtube.com/watch?v=ZoVWedQOQl4

Cookingboy• 12 years ago

I am more amazed at the lack of smog blocking visibility. Disclaimer: I'm Chinese and I love Beijing as a city, on a good day it's about as clean as LA and on a bad day its...well you can barely see airport terminal when you land.

digikata• 12 years ago

In LA at least, smog goes to about 5000ft to the inversion layer. Looking vertically through that distance you get much better visibility vs looking horizontally through miles of smog. You can notice the effect looking out a plane window at cruise altitude compared to landing and takeoff.

celoyd3• 12 years ago

Exactly. This is why distant city lights often twinkle even more than stars do: there’s more atmosphere between you and them than between you and the stars.

Another effect here is that Skybox’s video uses the pan band, which includes infrared to 900 nm[0], and smog is usually pretty transparent in NIR, depending.

0. http://skybox.com/uploads/10/08/imageryandvideospecsheet.pdf

And a third important factor is that smog is very diffuse (by definition: otherwise you call it a smoke plume), so if you have the bit depth you can just increase contrast until you get a good image.

(I work at Mapbox on satellite imagery, but wasn’t involved with this particular blog post; what I’m saying here is stuff that people in remote sensing Just Know.)

elwell• 12 years ago

and: "west la" != "central la"

nysv• 12 years ago

It could be using a wavelengths that go through smog.

PakG1• 12 years ago

That'd be interesting, given this article I saw a while back:

http://www.scmp.com/news/china/article/1347835/security-fear...

Professor Yang Aiping, an expert in digital imaging with the School of Electronic Information Engineering of Tianjin University and leader of the civilian team, said she was facing tremendous pressure because of the enormous technological challenges.

"Most studies in other countries are to do with fog. In China, most people think that fog and smog can be dealt by the same method. Our preliminary research shows that the smog particles are quite different from the small water droplets of fog in terms of optical properties," she said.

"We need to heavily revise, if not completely rewrite, algorithms in some mathematical models. We also need to do lots of computer simulation and extensive field tests."

notastartup2• 12 years ago

would LOVE to have a developer API to skybox. The things one could do!

nkurz2• 12 years ago

Urthecast says they'll be offering one, although I don't know what they'll end up allowing: http://www.urthecast.com/developer

What sort of things would you want an API for?

notastartup2• 12 years ago

Oh, I was just thinking of how cool it would be to have a live satellite video to create my own mobile apps.

Urthecast seems like it provides images, what would be really awesome is if they offered some short time interval based image refreshing. (acquire new images every few minutes)

TallGuyShort• 12 years ago

They seem to be careful not to show a large object like a plane crossing the "seams" that appear in the video (similar to the seams in satellite imagery on maps where they've patched together data from multiple passes / satellites). When you see the cars on the freeway they seem to disappear at the seams. Does the camera have to be focused on an area the size of the blocks they show? This is still very impressive - I don't mean to downplay the technical achievement, but I'm just trying to get a realistic sense of where the technology is at. I suspect this is video overlaid on static images.

celoyd3• 12 years ago

The video field of view is 1.1 by 2 km: http://skybox.com/uploads/10/08/imageryandvideospecsheet.pdf

Purely speculating, not going on anything they’ve said: theoretically when they have more satellites you might be able to patch together a larger area with simultaneous video from several birds. You’d have a slightly ugly angle difference at the seam, of course. There may be technical constraints here that I’m not thinking of, though.

In any case, at 1 m GSD and 30 fps, 1.1 by 2 km is 66 megapixels a second. Even efficiently compressed, that’s a lot of information already.

sixothree• 12 years ago

It looks more like the fov is 0.1 by 2 km (in this particular video).

omegant• 12 years ago

It seems like the part of the image showing the video is surrounded by pictures (not video). It seems everything is video because he is moving the image around just at the right time. A cool technology enanced with a cool trick.

hnriot• 12 years ago

it's not a trick, it's obviously overlaying video against a google earth background - that's not trickery or cheating, the satellite has a limited FOV and limited bandwidth to tx the data.

phreeza• 12 years ago

I was for some reason completely unaware of this possibility. How much would comissioning such a clip cost, and whats the delay? I looked through the website but couldn't seem to find concrete info. I am surprised that the media isn't using this, like they have taken to using satellite imagery on news shows now. They could show moving imagery of troop movements on the Crimea right now? That seems like it would have a huge impact...

akiselev• 12 years ago

Everyone I know who's worked on microsatellite imaging has talked about the financial district. The thinking goes: watch the Panama or Suez Canal and you're the first one to know when an oil tanker gets delayed, etc..

apaprocki• 12 years ago

You can do that right now on a Bloomberg terminal -- definitely don't need satellite imagery. Ships have transponders that tell you where they are. There are definite financial sector use cases, though.

oniTony• 12 years ago

Those guys have done a TED talk about designing and launching their lightweight satellites.

http://www.ted.com/talks/dan_berkenstock_the_world_is_one_bi...

drpancake• 12 years ago

UrtheCast are working on something similar. Their camera recently made it to the ISS and the next step is a spacewalk to install it.

http://www.urthecast.com

celoyd3• 12 years ago

And the third microsat company with operations coming online soon is Planet Labs: http://www.planet-labs.com

Robinson Meyer at “The Atlantic” did a nice overview two months ago: http://www.theatlantic.com/technology/archive/2014/01/silico...

It’s an interesting time in remote sensing.

nkurz2• 12 years ago

Both cameras were installed a couple weeks ago and are functioning: http://blog.urthecast.com/updates/urthecast-cameras-successf...

(Yes, you'd think they'd update their website.)

rasz_pl• 12 years ago

Ah yes, Uthercast

https://news.ycombinator.com/item?id=7130768

They are owned by Longford. Longford owned perfect cover for intelligence assets in middle east (oilfields in Iraq), all of a sudden they sold those and took over spy sat startup.

CIA money laundering/cover for intelligence assets type of deal.

samelawrence• 12 years ago

So, I guess the future of Google Maps is where your GPS actually shows your car driving in real time down the highway.

I love living in a video game.

incanus77• 12 years ago

No, it's the future of maps, not Google Maps.

ChuckMcM• 12 years ago

Perhaps the most interesting thing about this is the notion that cubesats are not 'toys'. That said, given the low cost of compute one wonders if satellite mapping which is to say generation of structured data on orbit from a high resolution locally obtained imagery is something that might get more work.

Specifically there is a lot of work in the mapping industry for taking a satellite image and turning it into a map. But there isn't nearly as much (if any) work about having a satellite, which can image the same spot repeatedly, providing a downlink of the the map rather than the image. By re-imaging you can just punt on features that are hard to guess and wait for the next pass to see if they will get easier. You might also be able to use multi-angle shadow analysis to pull some 3D feature extraction as well.

natch• 12 years ago

Not sure why the frantic movement of the map was necessary. Or a looping video, for that matter. Hold still for a while, let us watch stuff moving without moving the map. Reminds me of the faked Roswell "alien autopsy" video that showed a series very quick edits in succession, no way to focus on anything or get a good look at what is going on. Something seems fishy here.

djfred• 12 years ago

Ask the NSA how to store data.

madaxe_again2• 12 years ago

This is childs-play compared to what the DoD are up to with WAPS, currently in the format of ARGUS.

http://en.wikipedia.org/wiki/ARGUS-IS

Simultaneous video surveillance of 8 x 8km with a single drone, at 15cm resolution.

I'm afraid to say that while this is neat, realtime video maps of the planet will be provided by drone tech, not satellites - for now. When we can stick something in geosync with amazing eyes at a low energy cost (space elevator), this picture may change - but until then... nope.

knowaveragejoe• 12 years ago

While impressive, I have a hard time believing this claim:

As ARGUS floats overhead for months at a time, it dragnet tracks every moving person and vehicle and chronographs their movements, allowing forensic investigators to rewind the footage and watch the activities of anyone they select within the footage.

The amount of footage just one pod collects in a short span of time is monumental. They're storing what amounts to decades of footage for just one day's worth of operation. Maybe they have some criteria that trims unnecessary footage, but I can't imagine that saving all that much space as they don't want to miss anything.

madaxe_again2• 12 years ago

Storage is cheap. If you're storing on HDDs for quick access, the cost is small - if you're storing on archival tape in silos, the cost drops even further.

EA• 12 years ago

The near-term future of disruptive spaceflight isn't sending big heavy objects into space---it's sending nano-satellites into orbit around the earth.

Planes Landing in Beijing: Video from Space

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