saeranv

36 ms·

331.
by saeranv 6y ago
IANAE but the general idea from the discipline of urban geography is that industrialization, and also the knowledge economy relies on the economies of scales that come from high density, mixed-used urbanization. These regions rely on extrem
332.
by saeranv 6y ago
However, it's a lot easier to passively heat a house then to passively cool a house. We could easily upgrade building envelope standards, incorporate a heat pump, and reduce the heating-associated CO2 emissions to a fraction. If we did
333.
by saeranv 6y ago
The effectiviness of heat pumps is insane. I worked in an architectural firm, and had an epiphany one day that every single one of our highest energy performing projects used some sort of (air/ground/water) source heat pump. We ha
334.
by saeranv 6y ago
Re: <1 MWh/capita annum Which brings up another issue, which is energy density/m2 of land. To support industrialization/high density urbanism the only fuel sources that do this are currently fossil fuels, or nuclear, but n
335.
by saeranv 6y ago
Yes, and for this reason (IIRC) GDP/capita scales linearly with MWH/capita.
336.
by saeranv 6y ago
I made a pinhole camera that plots 3D geometries in matplotlib/geopandas[1]. It's still WIP (need to do some minimal ray-casting to deal with depth ambiguity), but the overall goal is to develop a set of minimal camera perspective
337.
by saeranv 6y ago
The context for my point is that we already have authoritarian countries (i.e China, Russia) already using the internet for mass surveillance (and selling the technology to other countries), we have Trump (who has to be considered at least
338.
by saeranv 6y ago
> - have stats about the meeting (who was actively participating, maybe via gaze tracking or seeing whether the tab is in view). We're they speaking aggressively, friendly, etc. This is one's dangerous. I'm actually findin
339.
by saeranv 6y ago
There's a couple of really good things in this intro that I wanted to point out. 1. I appreciate the rigour that went into the math notation. I need to see equations to start to make sense of something. And if you're a beginner, t
340.
by saeranv 6y ago
I may be getting this wrong, but doesn't that slide show the PCA being done on multiple images? Each image is 321 x 261, which concats to a 83781 vector. Then they're repeating that for 32 images producing a 83781 x 32 matrix, whi
341.
by saeranv 6y ago
What exactly is he performing the PCA on? I assume the image is concatenated into a 1D vector, so what makes up the matrix that's used to generate the eigenvectors? RGB values?
342.
by saeranv 6y ago
It's interesting how the legs are often an unequal length in the reconstruction when the person is walking, due to some incorrect interpretation of the camera perspective. I would have guessed this wouldn't be a problem given that
343.
by saeranv 6y ago
Yes, the panel temperature can be hugely different due to absorption of radiation (I don't think it's the thermal mass, which as you say is going to be negligible). Ambient air temperature is not a good way to approximate the pane
344.
by saeranv 6y ago
That's surprising because what gets bounced back from overcast skies is long-wave radiation (infrared) - which I didn't think had an impact on solar panel production. This occurs because the absorptivity of a clear sky is higher t
345.
by saeranv 6y ago
Yeah, or even a quarter sphere since the sun only occupies the southern part of the hemisphere (north of equator).
346.
by saeranv 6y ago
Other people are implying it, but to be more specific, the boost in cooling is the evaporative cooling impact of dew.
347.
by saeranv 6y ago
Fascinating. Can you explain this: "X can be a function of X expressed as X=X(X++)." This is my (incorrect) attempt to make sense of the equation: X++ = X + 1 (?) X() What does this mean? How can X be a function?
348.
by saeranv 6y ago
> Does anyone assert that any photon carries information about what it interacted with in the past? Does a photon have any information content other than its energy/wavelength? So "each one carries a bit of the image of whateve
349.
by saeranv 6y ago
> If the top scientists from well-funded teams came up with estimates that were so wildly off, I'm not sure why we have any hope of getting these things right. I think there's a lot of confusion from the general public about ho
350.
History Will Judge the Complicit(theatlantic.com)
9 points by saeranv 6y ago|0 comments
351.
by saeranv 6y ago
Okay, so it has nothing to do with the orientation of the point planes. Having thought about it some more, I think this is a consequence of the reduction of surface area hit by the LIDAR rays, as the square of it's distance. Basically,
352.
by saeranv 6y ago
That's a possibility. Are you rotating your squares in just the xy plane, or also along the "pitch"? I find your project fascinating, thank you for sharing it!
353.
by saeranv 6y ago
Interesting, so it's the data they provide that is sparse. If you expand the view to full screen, and stare straight-on at the wall, you can clearly see the 'sparse' pixels form a circle around the camera on the ground and at
354.
by saeranv 6y ago
Looking at this makes me wonder how Google combines the point data to generate clean polygons. I.e when I hover my mouse over a wall in Street View, it identifies correctly the entire connected plane. Does anyone know how this is done?
355.
by saeranv 6y ago
This seems really cool, but I don't quite understand what I'm looking at. Is this a processed version of the LIDAR data for the environment? Also why do the "pixels" get less dense at the edges of the view? I.e as you ro
356.
by saeranv 6y ago
To a certain degree I agree with you, although I think it should be practiced in conjunction with Twitter's strategy of flagging/hiding tweets. It seems like a good way to ensure the racist/violent/fake content can be mo
357.
by saeranv 6y ago
I think I'm finally starting to see the heart of the problem now. > You will see that 5% of the time you will falsely conclude that A < B and that in another 5% of the time you will conclude that B < A, leading to an overall f
358.
by saeranv 6y ago
I see your point. But isn't that only true for two-tailed tests? This sort of ordering problem seems more suited to a one-tailed test. Let's say for example, we represent the bins of the probability distribution as the number of B
359.
by saeranv 6y ago
I think the math here should be right, although perhaps the confusion here is because I wasn't clear about the role of the order: We're ordering the trials by speed, and computing the probability of getting an AAABBB ordering. The
360.
by saeranv 6y ago
Yes, this is correct.

More ›