this post was submitted on 17 Sep 2023
426 points (71.9% liked)

Technology

60079 readers
3334 users here now

This is a most excellent place for technology news and articles.


Our Rules


  1. Follow the lemmy.world rules.
  2. Only tech related content.
  3. Be excellent to each another!
  4. Mod approved content bots can post up to 10 articles per day.
  5. Threads asking for personal tech support may be deleted.
  6. Politics threads may be removed.
  7. No memes allowed as posts, OK to post as comments.
  8. Only approved bots from the list below, to ask if your bot can be added please contact us.
  9. Check for duplicates before posting, duplicates may be removed

Approved Bots


founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
[–] Entropius@lemmy.world 474 points 1 year ago (4 children)

LiDAR is essentially radar that uses light instead of sound

Radar doesn’t use sound. It sounds like the author doesn’t know the difference between sonar and radar.

[–] Ganondorf@kbin.social 170 points 1 year ago (2 children)

This is why comments are so useful. I was already on the fence about viewing a site named futurism and your comment made sure I will avoid it moving forward.

[–] ABCDE@lemmy.world 31 points 1 year ago

I think that's a big qualm of mine in terms of the sources allowed here, and I suppose it will take time to weed out the trustworthy from the not.

[–] Deceptichum@kbin.social 8 points 1 year ago (2 children)

Why does the word futurism put you the fence?

[–] xkforce@lemmy.world 55 points 1 year ago

A lot of articles that either use that buzzword or are published by sites that have that in their name are utter garbage. i.e rediculous predictions, inaccurate headlines/content etc.

[–] anlumo@lemmy.world 5 points 1 year ago (1 children)

Futurists are people who cosplay as scientists predicting stuff they have no clue about.

[–] Lost_My_Mind@lemmy.world 1 points 4 months ago

11 months into the future, you will get a useless unfunny reply!

[–] PM_Your_Nudes_Please@lemmy.world 8 points 1 year ago* (last edited 1 year ago) (1 children)

Yeah, it uses radio frequencies. RaDAR stands for “Radio Detection And Ranging”. It uses radio waves (usually in the microwave bandwidth) to detect things. Basically, since those radio waves are affected by the Doppler effect, you can have a computer do some math to determine the speed of whatever those waves reflected off of. Because the Doppler effect changes a wave based on how fast an object is moving relative to an observer. So if you’re a stationary observer, you can figure out how fast an object is moving relative to yourself, purely based on how much that moving object changes the waves you’re reflecting off of it.

[–] Slotos@feddit.nl 7 points 1 year ago (2 children)

Every wave is affected by Doppler effect.

When a car rushes your way, it’s a tiny bit bluer, a little bit hotter, it’s drivers’ phone is operating on a slightly higher frequency and it sounds higher. According to you.

[–] Tristaniopsis@aussie.zone 2 points 11 months ago

Well… also according to most physicists.

[–] Jarix@lemmy.world 1 points 4 months ago

That's like all relative dude

[–] randommilkmake@lemmynsfw.com -2 points 10 months ago (1 children)

Why are you misquoting the article that is not what it says

The real quote

LiDAR is essentially radar that uses light instead of radio waves...

[–] Entropius@lemmy.world 7 points 10 months ago

Why are you misquoting the article that is not what it says

Why are you accusing me of something I didn’t do?

From the bottom of the article:

Updated to correct an error in describing how radar works.

I quoted it correctly at the time. They just edited it after I commented.