People running these teams should consider getting a radiologist on board. Radiologist live and breath analyzing information like this. They might make valuable contribution to testing these kind of approaches
@josue_aubert
20 күн бұрын
Thanks !!!
@kamkri3
Ай бұрын
Such a great video and explanation! Helps me in geodetic earth observation seminar at university:)
@rickytan6711
Ай бұрын
I still can't understand what's the way that the synthetic aperture radar combine all independent picture together.
@MaxLenormand
Ай бұрын
I decided not to really touch on that in depth because 1. I don't fully understand it myself and 2. it could have made this even longer, when I was trying to stick to a high level introduction I do suggest you check out Thomas Ager's book though if you want more in depth information!
@ivekuukkeli2156
2 ай бұрын
Great explanation in the first half. But in the beginning the range is is just one pulse or bump. There is not any explanation, how the one pulse is suddenly many bumps i.e. pixels i.e. picture elements? This is not explained in other vbloggers presentations, so you are not the only. Also the sending perpendicularly is essential to present.
@aaaaaaaa2008-h8z
3 ай бұрын
Great
@stuartgray5877
3 ай бұрын
My company built the Worldview 1 & 2 satellites for Digital Globe. I personally helped build the 2-Axis Gimbals for the High Gain Antennas so they could track ground stations even while imaging. We also likely developed GEO Imaging satellites that can image under 1 meter on the surface FROM GEO ORBIT! Ask any Optical Engineer today if this is possible, and they will likely say NO. Lookup the MOIRE Program from Ball Aerospace. (Membrane Optic Imager Real-Time Exploitation (MOIRE) telescope.) It was going to be the next greatest thing in space imaging tech. We built a tech demonstrator of the concept and proved it WOULD WORK. Then the entire program completely disappeared never to be heard from again. I WONDER WHY?
@stuartgray5877
3 ай бұрын
I also helped build the NPP-Suomi Spacecraft which took the images used in the famous "Blue Marble" composite image released by NASA (Bob Simmons) in about 2012. That full earth image was assembled by images from the VIIRS Instrument in LEO. I then helped build, launch, and commission its big Brother JPSS-1 (now NOAA-20). And regarding "imaging technology", I also helped build JWST, Kepler Space Telescope, IXPE Xray Telescope, and I am helping with the upcoming NEO-S mission. My company built the corrective optics for Hubble and now most of the instruments aboard Hubble were provided by us.
@aliazizikia316
3 ай бұрын
When the satellite moves the angel of view will change too doesn't it effect on finial image and make it weird or unaccurate ?
@vancelandry9369
3 ай бұрын
Why do modern men sound like Kermit The Frog?
@AntonVattay
4 ай бұрын
Hey, I'm learning SAR and this really helped. I think the only thing I'm still curious to get an intuition for is how they used SAR on film and lenses to do the "analog" computing of SAR images before computers had enough storage and compute to do what they do now.
@MaxLenormand
4 ай бұрын
That’s actually a really good question, which I didn’t even think about I have no idea!
@durbadas3596
4 ай бұрын
this video was so informative, thank you so much!
@rand0mroman
5 ай бұрын
What a great Video! So well explained in such a short time! Thank you very much 💪
@dantasfelipe
5 ай бұрын
Muito obrigado por esta aula. Realmente, é contra intuitivo trabalhar com imagem de radar quando você trabalha com imagens ópticas há muito tempo. Parabéns a todos da sua equipe.
@MaxLenormand
5 ай бұрын
I had to translate your message but it seems like this was helpful to you, for which I'm glad! Thanks for taking the time to write this!
@veronicalogotheti1162
5 ай бұрын
Thank you
@veronicalogotheti1162
5 ай бұрын
Satellites photos take two o three days to see them
@veronicalogotheti1162
5 ай бұрын
Google maps are photos Done every week
@justinoser9482
5 ай бұрын
Incredible video! 👏 I’m working on looking for a job in the space sector and SAR is something I’ve become fascinated by. I’ve read up on it a bit and started reading Thomas Ager’s “The Essentials of SAR.” Having explanations with visuals like this really helped to reinforce and unlock that knowledge. Thank you!
@Teh-Penguin
6 ай бұрын
Thanks for the video! Learned a few things I didn't know and this came just right as I begin working with the stuff.
@MaxLenormand
6 ай бұрын
Really glad to read it was helpful!
@Teh-Penguin
6 ай бұрын
Strictly speaking, the aperture of a lens is the ratio between the lens opening and the focal length, instead of it being the size of a lens. The smaller the ratio between focal length and aperture (f number), the closer the two are together and the more light can hit the sensor. Numbers below f/1 mean, that the aperture opening is larger than the focal length. Going back to SAR, you can imagine that by moving the radar satellite around while looking at the same object is similar to opening the aperture of a lens (like going from f/11 to f/1.8 in the image at 9:30) more and more and letting more light in and thus increasing the Signal to Noise Ratio. With digital cameras, this means we get more detail and less noise and with SAR it means... the very same thing :D
@MaxLenormand
6 ай бұрын
Totally! I didn't do the best job of going from f/1 in optical -> SAR I also wanted to mostly convey the idea of why it's called "Synthetic Aperture" in a relatively short amount of time. That's why I like the fact people can comment on these videos, I get new ideas as to how to better tell these next time :)
@Teh-Penguin
6 ай бұрын
Personally, I'd explain SNR with sound. Let's say you have two speakers: one plays, let's say, an audiobook, and does so at a set volume that you never change. The second speaker plays white noise. Speaker #1 is your signal, speaker #2 is your noise. As speaker #2 gets louder, it's more and more difficult to understand the audiobook and at some point the signal is unusable because of the very high noise.
@MaxLenormand
6 ай бұрын
That's a good point! There are many ways to approach this, I wanted to keep it related to images though
@dmgeo
6 ай бұрын
Great video. Congrats
@MaxLenormand
6 ай бұрын
Thank you!
@olivierthepaut1733
6 ай бұрын
Spotted a typo in Synthetic Aperture Radar, between 7 and 8 minutes 😉
@MaxLenormand
6 ай бұрын
Oh my, good catch... That's starting to be a lot of typos for a 23min video. I spent a lot of time trying to get the basics right, that I seem to have overlooked some of the polish here, apologies for that I'll try to do better next time!
@TheHappinesspeace
6 ай бұрын
Amazing ❤ thanks for that vidéo
@alejandrovillanueva4179
6 ай бұрын
What a great video, looking forward for the nexts ones.
@5MOBILE
6 ай бұрын
This really helped me understand SAR more! Thanks!
@thomasdimartino4854
6 ай бұрын
I am totally un-phase-d of your success Max, this is one heck of a content!
@MaxLenormand
6 ай бұрын
So many SAR puns out there ;) Thanks a lot Thomas! I'm glad you liked this one!
@CATDRL2
6 ай бұрын
I'll be posting your video on the NasaSpaceFlight forum to give you a greater audience and possibility of a 3D Bender editor with the skills your searching for. Best, Tony. (also i"m you 901st subscriber)
@spacefromspace
6 ай бұрын
Man you really nailed this video! Everytime someone asks me about SAR from now on I'll be linking this to them. Looking forward to seeing more!
@MaxLenormand
6 ай бұрын
Thanks a lot Harry! My hope was to make a good reference for anyone wanting to learn more about SAR!
@rand0mroman
5 ай бұрын
Exactly my train of thought after watching it!
@darrenmuff8040
6 ай бұрын
Really great explanation Maxime! The most comprehensive (and entertaining) video on the subject of SAR. This should be essential viewing for anyone getting into Earth Observation.
@skyfi-app
6 ай бұрын
This video is way cooler than being able to download free SAR imagery through SkyFi!
@MaxLenormand
6 ай бұрын
Well, SkyFi helped the making of this video, had to have a way to find all the Umbra images!
@gipugly
6 ай бұрын
Massively underrated channel and fantastic video. How do you not have at least 5k subs yet??
@MaxLenormand
6 ай бұрын
Thank you! Hopefully it's only a matter of time!
@Space_Parrot
6 ай бұрын
SAR can see into buildings the same way when you bounce a ball under a table and strike the underside of the table, the ball bounces back to where it was thrown, never through the table. If a building has an opening wide enough the microwaves can bounce back out the opening and return an image of what was inside. Think like a jet in a hangar.
@MaxLenormand
6 ай бұрын
That's true! Different wave lengths also have different penetration properties, so some can go through very thin roofs to see below, there are some examples of seeing planes through hangars in SAR. I made the choice of not talking about different bands to keep it short. And that Capella blog post just makes me laugh
@thesplatstrategist
6 ай бұрын
Incredible video quality, and learned so much about SAR
@MaxLenormand
6 ай бұрын
Thanks so much! And so glad if more people are learning about SAR!
@aliabbaswajid
6 ай бұрын
Great explanation. Learnt so much and now I see SAR in a different way ❤
@MaxLenormand
6 ай бұрын
Thank you!
@daviddemeij
6 ай бұрын
Great explanation on SAR, after working with geospatial data for 5 years I finally understand it now 😁
@MaxLenormand
6 ай бұрын
If anything I'm glad that's my contribution to the Earth Observation!
@MaxLenormand
6 ай бұрын
Turns out you can't add a link at the end of a video with less than 1k subscribers :') So please subscribe, and here's the Patreon link. Not as fun as clicking on my face but it would help just as much! www.patreon.com/mindsbehindmaps Also, some mistakes spotted by viewers: - All the early animations explaining the basics of radar have a typo in them: It's "Received Energy", not "Recieved". This one's painful because it appears so many times - 7:43 has another typo, "Synthetic" Aperture Radar. Thanks to everyone for keeping me accountable and pointing these errors out!
@EduardHeijkoop
6 ай бұрын
Great video and great timing as I'm writing up my dissertation, subscribed! One note though: in the "Basics of Radar" section it should be "receive" and not "recieve."
@MaxLenormand
6 ай бұрын
@@EduardHeijkoopThank you! Good catch, no matter how many times I rewatch these there's always a mistake! Unfortunately I can't edit this in the video
@brunosan
6 ай бұрын
@@MaxLenormand I saw that too, and I think it makes it even better. It shows you did the figures. It is the imperfections that bring the sense of scale of the effort :)
@borthwey
6 ай бұрын
I still couldn't find the info I was looking for. From what I saw a satellite takes at most two hours to circle the Earth. This means it covers 2,77 meters in 1/2000 of a second. So if that's the speed of the camera shutter, it's a 2,77 meters blur. Is there a motor on the camera to make it track the surface of the Earth, cancelling the satellite's speed, or is the shutter speed faster?
@MaxLenormand
6 ай бұрын
That's a good question, I'm not quite sure! A quick search found this Quora question with someone mentioning Corona spy satellites would rotate to compensate: www.quora.com/How-does-satellite-imaging-work-If-satellites-are-moving-really-fast-how-do-they-take-photos-of-specific-places-without-any-motion-blur
@Renat9453
7 ай бұрын
Content and quality on a very high level! I was very surprised that you have only one video and less than a K subs. Continue your work! You have a very high potential and skills that will pay off!
@bartmanxoxo
9 ай бұрын
Youre a fart smeller. Im sorry im mean Smart Feller. 😂
@Cyberpunk_Radio_PBS
9 ай бұрын
Who doesn't know the history of space travel and how we launch satellites? flat earthers?
@praudhaprayogi
10 ай бұрын
Amazing video!
@aepokkvulpex
10 ай бұрын
So Sentinel 2 satellite imagery maps if made 3D would be approximately a ½ scale Minecraft world, got it
@abramjessiah
10 ай бұрын
Love this video! Would love to work with you if you need map animations and other 3D visualisations.
@stevenpoff6273
10 ай бұрын
Satellites are FAKE just like their FAKE SPACE PROGRAM.
@MaxLenormand
11 ай бұрын
KZitem removed ability to link in Shorts. Yay. See the latest community post I made to find the link If for whatever reason you're on desktop, here's the link: forms.gle/8d9ekNxTi1FVYdyp7
@jayerjavec
11 ай бұрын
There are Geostationary satellites above us as well. The name suggests they are stationery above a certain location or area - sync orbit. Enter real time observations. Thanks for a great video.
@johngreen4610
11 ай бұрын
I wish you had explained you had explained the relationship between the diameter of an objective lens and the maximum resolution of the system. The Dawes limit.
@lukustreloar7243
11 ай бұрын
That means the military can see us in our back yard ? Great show thanks.❤👍
@gregkral4467
11 ай бұрын
Great video. This was vey interesting. Thanks.
@MissionaryForMexico
11 ай бұрын
You guys would be amazed if you seen imagery from a key hole 11 spy satellite! Let alone imagery from a SR-71.
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