open-location-code
s2geometry
open-location-code | s2geometry | |
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27 | 26 | |
4,012 | 2,185 | |
0.4% | 1.3% | |
0.0 | 5.8 | |
17 days ago | 2 days ago | |
Java | C++ | |
Apache License 2.0 | Apache License 2.0 |
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Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
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open-location-code
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A Critical Analysis of the What3Words Geocoding Algorithm
Pluscode is a trademark. The actual standard is called "open location code" and is unrestricted - https://github.com/google/open-location-code/
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Evaluation of Location Encoding Systems
Yeah, that seems like a bad design choice. If you look at the spec [0], you can see that they only use "23456789CFGHJMPQRVWX" in the codes. They apparently scored the letters based on how well they can spell 10000 words in 30 languages, without thinking about character similarity. If they had involved actual humans instead of counting letter frequency, they might have noticed that the letter W looks similar to VV, and that its English name is "double U". And tried a letter like N or Y, which would be much harder to confuse.
[0] https://github.com/google/open-location-code/blob/main/docs/...
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In Hangzhou, China, there is a building that houses over 30,000 people.
Lots of thoughts from the founders incl comparison with other systems here: https://github.com/google/open-location-code/wiki/Evaluation-of-Location-Encoding-Systems
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Why doesn't Costa Rica use real addresses?
It's licensed Apache 2.0 https://github.com/google/open-location-code
- An Evaluation of Location Encoding Systems (2018)
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Houses having names instead of numbers.
I wish https://plus.codes/ took off. The benefit compared to what 3 words is that you can use the closest city to give directions and cells next to each other share the bigger cell name.
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SpaceX is live with T-Mobile announcement
And an additional shoutout for https://plus.codes/ from Google.
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r/Starlink Questions Thread - March 2022
New to this so sorry if this is stupid. I've been trying to use https://plus.codes to try to check an address for availability at starlink. Whatever code I put in, it simply tells me afterwards "please enter an address or a plus code". That website seems to give me either a shorter or a longer plus code. Neither of them seems to make the starlink website happy. When I try putting in the address, it doesn't like that either. Confused on where to go from here.
s2geometry
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Hexagons and Hilbert Curves – The Horrors of Distributed Spatial Indices
I experimented with geospatial Hilbert Curves as a Postgres extension [0] for PostGIS using the S2 [1] spherical geometry library. S2 uses a scale free cell coverage pattern that is numbered using six interlocking space filling Hilbert Curves [2].
By having both high level (cell) and low level (cell id) geometries it was a very powerful library which allowed projection from the hilbert space into a Postgres spatial index (spgist) including various trees, like noted in this article. It appears to be still quite active in development.
[0] https://github.com/michelp/pgs2
[1] https://s2geometry.io/
[2] https://s2geometry.io/devguide/s2cell_hierarchy
- Show HN: TG – Fast geometry library in C
- Unum: Vector Search engine in a single file
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Understanding Geohashes
If you check the h3geo comparison page, you should see plenty of alternatives to geohash, such as s2 or even h3 itself.
- Evaluation of Location Encoding Systems
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Inscribed angle theorem in 3D/higher dimension
See some discussion I started at https://github.com/google/s2geometry/issues/190
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An Interactive Explanation of Quadtrees
> It was quite hard for me to find open-source implementations of linear quadtrees.
You probably know this, but the S2 library has one: https://github.com/google/s2geometry
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Why doesn’t my pokèstop show up?
https://s2geometry.io shows how this works
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Needing advice to improve geodesic calculation time
If your points are distributed globally, however, I'd suggest using something like s2geometry (calculates over a sphere instead of an ellipsoid which is much faster + already has something called S2ClosestPointQuery).
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What is the best data structure for this problem?
Some alternative solutions are S2 from Google and H3 from Uber. These don't have the same issues as geohash because they work on a 3-d model of the geoid and not a 2-d cylindrical projection like Geohash.
What are some alternatives?
starlink-grpc-tools - Random scripts and other bits for interacting with the SpaceX Starlink user terminal hardware
h3 - Hexagonal hierarchical geospatial indexing system
Steamless - Steamless is a DRM remover of the SteamStub variants. The goal of Steamless is to make a single solution for unpacking all Steam DRM-packed files. Steamless aims to support as many games as possible.
S2 geometry - S2 geometry library in Go
gpstest - The #1 open-source Android GNSS/GPS test program
0.30000000000000004 - Floating Point Math Examples
internet-pi - Raspberry Pi config for all things Internet.
s2 - Node.js JavaScript / TypeScript bindings for Google S2
internet-monitoring - Monitor your network and internet speed with Docker & Prometheus
Kyrix - Interactive details-on-demand data visualizations at scale
ParaDrone - AutoPilot for Parachutes
sled - the champagne of beta embedded databases