bernulli
I do know that this course is still offered widely across the US, but maybe not within CS, and maybe not as a mandatory course.
But, bottom line: if you're interested, it's very likely you can take it - you may have to check your school of engineering or applied math department.
> I can not image the extra amount of work that get places on people that do not have children...
What you're forgetting is the amount of work required to raise children. That's an externality that is only covered through a social contract, where everyone contributes to a next generation. Why should parents put in the extra work to raise children that, god forbid, would ever do something you benefit from?
What you want is someone else doing the work so that you can just reap the benefits. You're a freeloader, plain and simple (other, less favorable words come to mind).
Unless, of course, you will never in your life use the services or inventions of anyone younger than you. But, somehow, I doubt that - am I right? You just expect those cohorts to just appear out od thin air to your benefit.
It’s wonderful to have someone listening because of a conscious decision rather than just following the obvious next step. Interact with your professor, ask questions, I’d hope most will try to be supportive, especially when you’re their age or even older. Best of luck to everyone doing this, it’s amazing.
I don’t think I understand the resolution then, could you explain a bit more? Say, I request data along a 100km line, every 10m. Do I get the same numbers if it’s in the same mesh cell with a sudden change when it’s crossed, or do I get some (bilinear?) interpolation?
I have two questions:
1) How does the spatial resolution come into this? Is it constant data all across the 2kmx2km (?) parcel with an abrupt change, or is it interpolated in some way? Can I query the coordinates of the mesh?
2) How 'historical' does it get? How far back can I go with this?
Thank you!
a few things to wrap this up for me, and thank you for your civil answer to a not so civil comment.
1st: I should have made this a 'yes and' rather than a 'no but' comment. It's a well written article with nice illustrations, and you put in the time to do so and share it with the world. Thank you for that!
2nd: Obviously you're right that it's possible to calculate the distance to plane by observing when it passes a certain point and then measuring the time until the sound hits you from that very point.
3rd: My smartassery still stands that "How far behind a plane is its noise?" is a misleading way to frame it - the noise is not behind the plane at all, it's actually significantly ahead of it. But (!), again, I should have made that a 'yes, and' instead, to add a facet to your nice article.
Cheers, and hope to read from you again!
I don't know what a pointing noise is.
> Light also encodes the direction to an objects past location, even though light is always moving faster than the object.
Yet the light is never outrun by the object, much like the subsonic plane never outruns its noise. However, here, the (fast) noise arrives after the (slow) plane. In your analogy, that would correspond to the (slow) object arriving before the (fast) light.
Explain to me again how any of that explains why the airplane passes me (and I see it 1e-6s later which seems to be somehow super important to you) before I hear it, even though its sound is traveling towards me much faster than the plane.
> But when the aircraft is closer to you, the attenuation is lower so you can hear the sound.
So we agree after all.
So, only in aircraft it is different? Magical aircraft physics after all?
> " If some one was standing 1000 meters away from you, and had a sign that flashed a sequence of numbers, 1,2,3,4,… once per second, and at the same time as the number flashed, they shouted the number loud enough that you could hear it, do you think what you heard and what you saw would be in sync?
Of course not.
But to humor you: which is the distinct event in a normally flying aircraft in which you can tie the exact point at which the light and sound signal leave the aircraft towards you so you can use that to calculate the distance? Spoiler: there isn't, you cannot, and that is precisely the point.
There are some examples currently in Ukraine, in which you could use your argument.
My point is that your one instant in time is completely arbitrary. You do not know where the position is, and you do not know when the sound was emanated. I.e., you cannot calculate anything.
Your math would work iff you observe a discrete event where you can tie sound and light - engine blow-up, for example. In all other cases, it means nothing.
Again - why don't you hear the sound of the aircraft taking off if speed of sound is the only effect?
Absolutely not. It depends on the Mach number, distance, sound weakening, and your hearing threshold.
You cannot hear some crazyman running at you, screaming, until he has passed you? You cannot hear the stereo in some guy's car until after he passed you? You cannot hear a siren of police until the car has passed you? Or are what you describe special magical airplane-only physics?
Well yeah, that's a sudden sound. My point precisely.
So why don't you hear from your observation point the airplane (or all airplanes for that matter) as it takes off, which is when it makes its first noise? And by all means, account for a few ms of light movement if that makes you happy.