This is very cool but, wow it takes a lot of cpu cycles. My desktop tripped out after about 5 minutes.
A global map of wind, weather, and ocean conditions
41–50 of 51 posts
Re: A global map of wind, weather, and ocean conditions
#42Earth is flat!
Re: A global map of wind, weather, and ocean conditions
#43Awesome.
Re: A global map of wind, weather, and ocean conditions
#44Whoa, check this out, 121 KM/h winds over the Antarctic Peninsula: https://earth.nullschool.net/#current/wind/surface/level/ort... It doesn't look like the other storms, in Hawaii and Florida. I wonder if these are normal conditions for that ridge?
I think it's called a katabatic wind, see the bottom of http://www.doc.ic.ac.uk/~kpt/terraquest/va/science/climate/c...
Re: A global map of wind, weather, and ocean conditions
#45It's especially interesting to watch Hermine travel up the US east coast right now. NHC forecast track here for the next 5 days: http://www.nhc.noaa.gov/graphics_at4.shtml?5-daynl#contents Right now is especially fascinating because the Euro and GFS models have recently begun to agree on the storm re-forming into a hurricane in a couple of days off the New Jersey coast. It's a fascinating time to watch wind patterns…
I have found the Euro model quite good for the Northeast US.
Ecmwf are the best medium term forecasts, 3-7 days.
Re: A global map of wind, weather, and ocean conditions
#46I forked this and put plate tectonic velocity vectors (in an earth-centered, earth-fixed coordinate system) in place of wind vectors but didn't have the .js knowledge or time to fix all the annotations and menu stuff. I'm hoping to get to that this fall (but I've been saying that for a year or two...): http://earth-analysis.com/vels/public/
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Re: A global map of wind, weather, and ocean conditions
#47I forked this and put plate tectonic velocity vectors (in an earth-centered, earth-fixed coordinate system) in place of wind vectors but didn't have the .js knowledge or time to fix all the annotations and menu stuff. I'm hoping to get to that this fall (but I've been saying that for a year or two...): http://earth-analysis.com/vels/public/
Nice! Lucky the annotations aren't accurate, I wouldn't like to have 68mph plate tectonics... :)
Interesting that there seem to be the plate tectonic versions of cyclones, like off Baja California.
Also, is the absence of data at the poles due to a coordinate system limitation?
Re: A global map of wind, weather, and ocean conditions
#48That's really cool, but does it really have to reload data on every viewport move/change? I use somewhat similar app for android made by Croatian Ministry of Maritime Affairs, Transport and Infrastructure https://play.google.com/store/apps/details?id=hr.mppi.nis&ah... There's also iOS version https://itunes.apple.com/us/app/nautical-info-service-croati... Really handy when you're out there.
It doesn't reload data - it just stops the particle system advection and restarts it when you're done moving. And yes, this is pretty necessary (at least it's quite hard to work around). To maintain the same view during viewport movement, it would have to keep track of all the particle trails in lat/long space and re-project them all to the new view. But this is implemented in canvas, so the trails (ie. particle hist…
I imagine you could accomplish the trails with some triangle strips in WebGL and let the GPU do the heavy lifting. I wonder if that would perform any better.
Re: A global map of wind, weather, and ocean conditions
#49I forked this and put plate tectonic velocity vectors (in an earth-centered, earth-fixed coordinate system) in place of wind vectors but didn't have the .js knowledge or time to fix all the annotations and menu stuff. I'm hoping to get to that this fall (but I've been saying that for a year or two...): http://earth-analysis.com/vels/public/
Nice! Lucky the annotations aren't accurate, I wouldn't like to have 68mph plate tectonics... :) Interesting that there seem to be the plate tectonic versions of cyclones, like off Baja California. Also, is the absence of data at the poles due to a coordinate system limitation?
The velocities are in mm/yr. 68 mph plate tectonics would definitely be terrifying; that's an order of magnitude faster than faults move during an earthquake.
There are two phenomena that look cyclonic.
The larger ones have to do with motion on a sphere: Euler showed that any velocity vector on a sphere can be represented as a rotation about a point (called an Euler pole); tectonic plates move basically rigidly, so the whole things rotate around a point. When that point is very close to (or within) the plate, the rotation is quite visible. You can see this in the Antarctic plate, halfway between Antarctica and Madagascar.
The second is an artifact of the vector visualization that Beccario used. The atmosphere is a continuum, so particles move smoothly between one location and another (more or less). But tectonic plates have rigid boundaries, and dive under each other or slide rigidly past one another. But the visualization algorithm doesn't know about these boundaries, so it creates particle paths that cross the boundaries and appear to swirl around. This probably happens to some degree in the mantle below the plates, but not really at the surface, with minor exceptions that I won't get into now unless people really want to nerd out on microplate rotation.
I'm not sure about the data gap at the poles. That's probably a real gap in the dataset I used; I haven't looked into it.
Re: A global map of wind, weather, and ocean conditions
#50Earlier quoted context omitted.
Nice! Lucky the annotations aren't accurate, I wouldn't like to have 68mph plate tectonics... :) Interesting that there seem to be the plate tectonic versions of cyclones, like off Baja California. Also, is the absence of data at the poles due to a coordinate system limitation?
The velocities are in mm/yr. 68 mph plate tectonics would definitely be terrifying; that's an order of magnitude faster than faults move during an earthquake. There are two phenomena that look cyclonic. The larger ones have to do with motion on a sphere: Euler showed that any velocity vector on a sphere can be represented as a rotation about a point (called an Euler pole); tectonic plates move basically rigidly, so t…
The point where velocity field vanishes seems to be a good example of the hairy ball theorem; even if the motion on the surface is not a rotation, if the field is continuous there has to be at least one point on the surface where velocity is zero.