Hacker News: alleycat5000

New comment by alleycat5000 in "Show HN: Rust library for numerical integration of real-valued functions"

alleycat5000 — Tue, 19 Nov 2024 23:58:48 +0000

One way to think about is that these techniques work by integrating exactly the polynomial that interpolates the function where you're sampling it, so you need to resolve the features of the function to get good accuracy.

New comment by alleycat5000 in "Show HN: Chebyshev approximation calculator"

alleycat5000 — Sat, 05 Oct 2024 02:54:48 +0000

https://people.maths.ox.ac.uk/trefethen/ATAP/

New comment by alleycat5000 in "Chebyshev approximation and how it can help (2012)"

alleycat5000 — Sat, 08 Jun 2024 02:30:12 +0000

A great book on this subject is Approximation Theory and Approximation Practice:

https://people.maths.ox.ac.uk/trefethen/ATAP/

Also chebfun!

https://www.chebfun.org/

New comment by alleycat5000 in "Every map of China is wrong"

alleycat5000 — Fri, 03 May 2024 02:48:58 +0000

It's because when you orthorectify an aerial image, you cast rays from the earth's surface to the camera, so if your model of the earth's surface is off (like when there's a giant man made structure) your mapping also gets wonky.

New comment by alleycat5000 in "Anatomy of a MapServer: how to leverage and visualize your geographical data"

alleycat5000 — Sun, 17 Mar 2024 05:25:12 +0000

You can use pmtiles through mapserver via GDAL!

New comment by alleycat5000 in "Cystic fibrosis breakthrough has given patients a chance to live longer"

alleycat5000 — Sat, 09 Mar 2024 18:55:14 +0000

Breath From Salt is a great book on CF and it's history in medicine.

https://benbellabooks.com/shop/breath-from-salt/

New comment by alleycat5000 in "Maxar's Open Satellite Feed"

alleycat5000 — Tue, 14 Nov 2023 02:44:45 +0000

There's a lot on info/tooling on AWS' open data site as well for exploring these datasets:

https://registry.opendata.aws/maxar-open-data/

New comment by alleycat5000 in "Polynomial interpolation"

alleycat5000 — Wed, 08 Feb 2023 21:12:32 +0000

Check out https://www.chebfun.org/ if you want to see some crazy stuff you can do with polynomials!

Also the book Approximation Theory and Approximation Practice

https://epubs.siam.org/doi/book/10.1137/1.9781611975949

is really great, by the author of Chebfun.

New comment by alleycat5000 in "Buy hi-resolution satellite images of any place on earth"

alleycat5000 — Sun, 22 Jan 2023 00:51:05 +0000

Albedo hasn't launched any satellites yet...

New comment by alleycat5000 in "Aerodynamics of Gravel Bikes"

alleycat5000 — Tue, 20 Sep 2022 13:06:48 +0000

Bicycle Quarterly (magazine by the same folks) is a great read, always such a joy when it arrives in the mail!

https://www.bikequarterly.com/

New comment by alleycat5000 in "Mitsuba 3 Physically Based Renderer"

alleycat5000 — Thu, 28 Jul 2022 01:22:58 +0000

This is a nice tutorial on differentiable and inverse rendering (one of the Mitsuba authors also gives the tutorial):

https://shuangz.com/courses/pbdr-course-sg20/

Inverse rendering is such a cool idea... solving for the inputs (3D models and materials) to a renderer such that they match real world inputs (photographs) by computing gradients automatically.

New comment by alleycat5000 in "Yerka bike uses frame as lock"

alleycat5000 — Mon, 07 Mar 2022 04:23:56 +0000

Brompton's (folding bikes) are a really great option, just take it with you.

brompton.com

New comment by alleycat5000 in "Hugo is awesome, its documentation is not"

alleycat5000 — Wed, 02 Mar 2022 15:51:38 +0000

I've also found Hugo's docs hard to use, but had a great experience learning it from

https://pragprog.com/titles/bhhugo/build-websites-with-hugo/

New comment by alleycat5000 in "Ask HN: I'm looking for a good book on the fundamentals of CS"

alleycat5000 — Thu, 09 Dec 2021 18:19:18 +0000

This book is a fun read too!

New comment by alleycat5000 in "A U.S. submarine struck an underwater mountain last month, the Navy says"

alleycat5000 — Wed, 03 Nov 2021 04:39:25 +0000

There's a public effort to get it all mapped:

https://seabed2030.org/

New comment by alleycat5000 in "WWII ships from Battle of Iwo Jima raised by volcanic activity, seismic shifts"

alleycat5000 — Mon, 25 Oct 2021 15:24:18 +0000

Here's a interesting talk on the underlying volcano and uplift.

https://youtu.be/SPmT0aS0pK4

Planet to Become Publicly Traded Company Through Merger with DMY IV

alleycat5000 — Wed, 07 Jul 2021 15:30:51 +0000

Article URL: https://planet.com/investors/press-releases/2021/planet-to-become-publicly-traded-company-through-merger-with-dmy-iv/

Comments URL: https://news.ycombinator.com/item?id=27762237

Points: 2

# Comments: 0

New comment by alleycat5000 in "The extraordinary story of two Pacific voyages of discovery a 1000 years apart"

alleycat5000 — Thu, 03 Jun 2021 15:19:03 +0000

I enjoyed reading Sea People: The Puzzle of Polynesia which is all about how Polynesia became populated.

https://www.amazon.com/Sea-People-Polynesia-Christina-Thomps...

New comment by alleycat5000 in "A Prophet at the Barbecue: Larry McMurtry, 1936–2021"

alleycat5000 — Tue, 11 May 2021 04:22:42 +0000

One of my favorite books! Pure mind candy.

New comment by alleycat5000 in "Learning About the GeoTIFF File Format with a Hex Editor (2018)"

alleycat5000 — Wed, 05 May 2021 18:32:32 +0000

We use COGs at work with mapserver (and GDAL's /vsis3/ magic) to serve up imagery internally for qa/qc:

https://github.com/pedros007/mapserver-docker

Literally saves hundreds of thousands of dollars a year by avoiding having to stage the imagery locally before serving it out!