h3
alang
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| h3 | alang | |
|---|---|---|
| 21 | 5 | |
| 4,588 | 75 | |
| 2.1% | - | |
| 7.1 | 1.8 | |
| 23 days ago | over 3 years ago | |
| C | C++ | |
| Apache License 2.0 | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
h3
- H3: Hexagonal hierarchical geospatial indexing system
- Evaluation of Location Encoding Systems
- Not sure if this is the worst or most genius indentation I've seen
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A population density map of the state of Pennsylvania
It looks like the base Kontur dataset uses H3 resolution 8, and there’s a lookup table here. “400m” seems to refer to the edge length (which averages to 461m).
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[ANN] HexTree: geographical region-to-value mapping
I can speak to quadtrees, but the primary reason for using this is that you need a geographic "dictionary" (not using the word map to avoid confusion with charts), and you're perhaps already using the H3 hexagonal grid system.
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What's everyone working on this week (34/2022)?
HexSet: is a way of storing a set of H3 cells in a tree, and doing fast (2-20 ns on my 2013 trashcan Mac Pro) membership tests. You must first convert the input data (e.g. GeoJSoN polygon) into H3 cells.
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Surprising result while transpiling C to Go
> What an amazing tool that can completely change function names when it converts from C to Go.
How can one read the code of the benchmark, then switch into virulent sarcasm mode without trying to understand the code? And seeing "+1" comments without any effort to understand is also disheartening.
The blog post had a link about the Go helper functions the author used. It lands on https://github.com/akhenakh/goh3/blob/main/h3.go This shows that the `FromGeo()` function used by the Go benchmark is a helper that calls transpiled functions. The benchmark code itself was of course not transpiled, so the sarcasm was unneeded and wrong.
If anyone wants to dig in deeper, the C function `latLngToCell()` calls 2 functions, see https://github.com/uber/h3/blob/master/src/h3lib/lib/h3Index...
- Completely ignorant Newbie needing help with launching Ubers H3 Software.
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Anyone doing geospatial queries? NoSQL? Amazon Location Service?
Uber just released their library to perform geospatial indexing - https://h3geo.org/. This might be an useful building block for you.
alang
- Build your own programming language in C++
-
Ask HN: What Are You Working On?
Currently working on a toolkit for writing custom interpreters [1], a language [2] on top of said toolkit and eventually a text editor [3] that uses them for scripting.
https://github.com/codr7/liblgpp
https://github.com/codr7/alang
https://github.com/codr7/qm
- Show HN: Build your own programming language in C++
- Show HN: Design your own programming language in C++
What are some alternatives?
S2 geometry - S2 geometry library in Go
ffprobe-wasm - A Web-based FFProbe. Powered by FFmpeg, Vue and Web Assembly!
Leaflet - 🍃 JavaScript library for mobile-friendly interactive maps 🇺🇦
mp4-rust - MP4 reader + writer library in Rust! 🎥🦀
mapbox-gl-js - Interactive, thoroughly customizable maps in the browser, powered by vector tiles and WebGL
electron-browser-shell - A minimal, tabbed web browser with support for Chrome extensions—built on Electron.
starlink-coverage - Calculating some statistics about Starlink satellites
pg-mem - An in memory postgres DB instance for your unit tests
s2geometry - Computational geometry and spatial indexing on the sphere
Galactic-State - Simplified global React state
maplibre-gl-js - MapLibre GL JS - Interactive vector tile maps in WebGL2
Oat++ - 🌱Light and powerful C++ web framework for highly scalable and resource-efficient web application. It's zero-dependency and easy-portable.