Earlier quoted context omitted.
Is CMOS a type of pushboom sensor?
CMOS is a manufacturing method for integrated circuits. Any type of sensor could be CMOS.
Thanks for answering!
Stealth bomber in flight on Google Maps
261–270 of 390 posts
Re: Stealth bomber in flight on Google Maps
#262Earlier quoted context omitted.
Is there a dataset with all the close-up satellite images somewhere?
https://www.nro.gov/
What an awful picture of the NRO Director. Surely they have plenty of experience in photography in less than ideal conditions. So why have this photo as the first thing I can see on their website?
Re: Stealth bomber in flight on Google Maps
#263Earlier quoted context omitted.
These are pushbroom linear sensors stacked up in the focal plane. The spectral channels are physically separated by larger distance than neighboring pixels in a Bayer grid. There is a time delay between each channel sweeping over the same location that gets corrected when the final imagery is aligned. The moving plane at altitude violates assumption of a static scene and exposes the scanning behavior.
Exactly! I'm working on some stuff now to exploit this very effect, the small time difference in the bands can be used to find velocities of moving objects.
The same effect can be used to estimate cloud heights, and to identify aircraft flying above clouds.
Parallax based Cloud Detection for Sentinel-2 Analysis Ready Data Generation https://www.researchgate.net/publication/332999809_Parallax_...
Aircraft Detection above Clouds by Sentinel-2 MSI Parallax https://www.mdpi.com/2072-4292/13/15/3016
Re: Stealth bomber in flight on Google Maps
#264Very impressive.
Re: Stealth bomber in flight on Google Maps
#265Earlier quoted context omitted.
How low are these satellites? I wouldn't expect the altitude of a plane to be any significant proportion of the altitude of a satellite.
The satellites are probably greater than 400 km altitude, or so, while the plane is probably 10 km. The plane is in the same rough order of magnitude as really tall mountains, which the satellite is presumably designed to compensate for, so I agree with your general assessment.
The Google Maps image copyright is for Maxar, which means the collector is likely Worldview-3, which is at nominally 614 km above the Earth.
Re: Stealth bomber in flight on Google Maps
#266Earlier quoted context omitted.
I think this plane is flying much lower and slower. The B2s are based at Whiteman AFB, which is about 25 miles south of this photograph. The prevailing winds in this part of the country are from the south, so I suspect that it is about to turn onto the final leg of its approach for a landing to the south. I’d guess that it’s no more than 8-10K’ and traveling at a 2-300 knots max.
I asked google maps to get directions from there to Whiteman AFB. Unfortunately, flight directions were not available.
And you are now on a list...
Re: Stealth bomber in flight on Google Maps
#267Earlier quoted context omitted.
https://www.nro.gov/
What an awful picture of the NRO Director. Surely they have plenty of experience in photography in less than ideal conditions. So why have this photo as the first thing I can see on their website?
Plot twist - that was taken from geosynchronous orbit.
Re: Stealth bomber in flight on Google Maps
#268Interesting how the three separate R/G/B images are taken independently a few ~seconds~ milliseconds apart, with a different color filter placed over the image sensor. I assume this is to maximize resolution, since no Bayer interpolation [0] is needed to demosaic the output of a traditional image sensor that integrates the color filters onto the sensor pixels themselves. As these satellites are not intended to photog…
These are pushbroom linear sensors stacked up in the focal plane. The spectral channels are physically separated by larger distance than neighboring pixels in a Bayer grid. There is a time delay between each channel sweeping over the same location that gets corrected when the final imagery is aligned. The moving plane at altitude violates assumption of a static scene and exposes the scanning behavior.
So... does anyone have a tool handy to correct the frames?
Better yet... does anyone have the corrected image?
Re: Stealth bomber in flight on Google Maps
#269Earlier quoted context omitted.
Would be disappointing for them to remove it for basically no reason, especially considering you can see a B-2 parked on the tarmac ( https://www.google.com/maps/place/38%C2%B043'29.9%22N+93%C2%... ) in the nearby Whiteman AFB. The B-2 was first flown 32 years ago. Its existence is neither covert or secret, but often used to do flybys at freaking football games where thousands of recording devices are present and act…
I wouldn't expect it to get deleted for any kind of security reason... but it will get replaced, and possibly faster because there's a defect. Moving object artifacts are undesirable and make the image more difficult to use especially for automation (such as Google's registration). They tend to get knocked out automatically over time as the composition algorithms try to keep a neatly consistent scene. They may even b…
Too bad they can't mark a tile (such as this one) to preserve forever from the backend control plane.
Re: Stealth bomber in flight on Google Maps
#270One of these flew low over my house in Kansas City last year. It was scheduled to do a fly-by of a local hospital so I was out on the porch watching for it. I saw it pass several miles to the south and went back inside thinking the show was over. A few minutes later I am sitting on the toilet when the house literally starts shaking. I run outside (barely getting my pants up...) in time to see it come right over top of the house at low altitude! (Apparently it had just been circling before to line up for the approach.)