Viewing profile — celoyd
celoyd
HN member- Joined
- Mon, Feb 19, 2007, 11:36 PM UTC
- HN karma
- 1,251
- Public activity
- 287 items
- HN profile
- View on Hacker News ↗
About celoyd
I work at http://mapbox.com, mostly on satellite imagery, but I comment here as myself. (If you’re interested in something we’re doing: charlie@ the company’s domain.)
Recent public activity
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Comment #10980578
Done. Thank you!
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Comment #10978797
It’s based on the example for 2-pass encoding, with tweaks for things like QuickTime support: https://gist.github.com/celoyd/90cc919105248a2ddc95
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Comment #10978792
I know it’s odd, but I wanted it not to be visible all at once.
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Comment #10978299
Oh, hello! I enjoyed your motion interpolation experiments, and I look forward to the blog post.
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Comment #10977913
Is there a good public reasonably live feed of this data? Right here: http://himawari8.nict.go.jp
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Comment #10977910
Also, it'd be nice to be able to pause it and really take in the colors. You can zoom in on the NICT browser: http://himawari8.nict.go.jp Their color mix is more cloud-oriented, so…
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Comment #10977892
Sorry. If there’s one thing I’ve learned from this project, it’s that video support is hard. I’m happy to take advice (preferably in the form of ffmpeg flags).
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Comment #10977887
Well-worn gray: https://en.wikipedia.org/wiki/Albedo It’s a loose comparison, since both asphalt and the moon’s surface vary. Plus, there are tricky things like specular reflection…
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Comment #10977851
Casual readers may not get your reference – the idea for DSCOVR literally came to Al Gore in a dream. I still think this is hilarious. One can indeed argue that DSCOVR has merit, a…
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Comment #10977829
I think they’re just responding to my joke with a joke ;)
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Comment #10977731
I made this, and I’m happy to answer questions. (And to politely ignore contentious remarks about how I characterized GOES-R.)
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Comment #9842524
Discovery at Udvar-Hazy is why I started this project. I saw the serial numbers on the tiles – almost close enough to touch on tiptoe – and remembered reading about some kind of da…
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Comment #9841842
How odd. I just switched fonts entirely (though still from Google Fonts). If anyone has a sense of what’s going on here, I’d love to fix it properly.
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Comment #9841789
> The environmentalist threw a fit about this "glue" and it was replaced with a glue that all the engineers said was not as safe, in regards to the tiles staying attached... This i…
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Comment #9841758
Fixed (I hope). Thanks for reporting.
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Comment #9241351
In the images in the blog post and the live map? Those aren’t pansharpened at all. If we do add pansharpening in a later version, it’ll likely be naïve, without spatially aware mod…
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Comment #9239583
I wrote that Mapbox post, and helped with some of the processing that happens to get this data on AWS. Yep, you get multispectral resolution of 30 m, and with pansharpening ( http:…
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Comment #8790974
it could be in the order of magnitude of 1.8cm per year at some places of Antartica and Canada. Here’s a visualization of elevation over time recorded by a GPS observatory at Baker…
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Comment #7344450
And the third microsat company with operations coming online soon is Planet Labs: http://www.planet-labs.com Robinson Meyer at “The Atlantic” did a nice overview two months ago: ht…
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Comment #7343429
The video field of view is 1.1 by 2 km: http://skybox.com/uploads/10/08/imageryandvideospecsheet.pdf Purely speculating, not going on anything they’ve said: theoretically when they…
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Comment #7343390
Exactly. This is why distant city lights often twinkle even more than stars do: there’s more atmosphere between you and them than between you and the stars. Another effect here is …
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Comment #6407807
I took a break from dealing with an in-band null problem in image data to check HN, and here’s this. Oof. Don’t represent missing data with a value in the same domain as real data.…
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Comment #6360284
I’ve worked with NASA and USGS a fair deal both for fun and professionally, and this is typical. They are extremely competent and sincerely want you to have good data. They are als…
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Comment #6257907
I’d be interested to know the ratio of the L0 data size to the L2/3/4 data[0] size – in other words, how many downlinked bits of sensor readout are processed per bit of useful scie…