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celoyd

HN member
Joined
Mon, Feb 19, 2007, 11:36 PM UTC
HN karma
1,251
Public activity
287 items

About celoyd

Charlie Loyd · [my username]@gmail.com · http://basecase.org/env/ · @vruba.

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

  1. comment
    Comment #10980578

    Done. Thank you!

  2. comment
    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

  3. comment
    Comment #10978792

    I know it’s odd, but I wanted it not to be visible all at once.

  4. comment
    Comment #10978299

    Oh, hello! I enjoyed your motion interpolation experiments, and I look forward to the blog post.

  5. comment
    Comment #10977913

    Is there a good public reasonably live feed of this data? Right here: http://himawari8.nict.go.jp

  6. comment
    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…

  7. comment
    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).

  8. comment
    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…

  9. comment
    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…

  10. comment
    Comment #10977829

    I think they’re just responding to my joke with a joke ;)

  11. comment
    Comment #10977731

    I made this, and I’m happy to answer questions. (And to politely ignore contentious remarks about how I characterized GOES-R.)

  12. comment
    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…

  13. comment
    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.

  14. comment
    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…

  15. comment
    Comment #9841758

    Fixed (I hope). Thanks for reporting.

  16. comment
    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…

  17. comment
    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:…

  18. comment
    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…

  19. comment
    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…

  20. comment
    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…

  21. comment
    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 …

  22. comment
    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.…

  23. comment
    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…

  24. comment
  25. comment
    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…