MTmtmail·Dec 16, 2021
A geometry library https://s2geometry.io/ (https://github.com/google/s2geometry)
In Ask HN: What else don't I know? (that the big tech companied have invented?)google
s2geometry
C++2018–2024
google / s2geometry
s2geometry
Computational geometry and spatial indexing on the sphere
10Distinct people
10Mentions
0Explicit recommenders
2.8KGitHub stars
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What it is
Computational geometry and spatial indexing on the sphere
GitHub
Where it is used
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This week on Hacker News
Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 10:02:05 AM UTC.
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Mentions over time
HN mentions by year10 dated mentions
Observed mentions: 2018-01-07 23:40:56 UTC to 2024-12-21 20:24:34 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 2 | 1 | 1 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
2 sources> store and index it by tiles
Options include the https://sqlite.org/rtree.html module, and building an application-specific mapping from geometric indexes to an integer keyspace (https://github.com/google/s2geometry or similar).
We're using SQLite archives of many GB successfully without issue. As long as the primary keyspace is well-designed (see also https://sqlite.org/withoutrowid.html), ranged queries are extremely fast.
> I'm never sure how to properly copy raw struct binary data from sql, directly in ram.
BLOB columns and an application-specific serialization/deserialization step work well. memcpy to a struct works if you are absolutely certain that you know what the layout will be. All of the standard perils apply - alignment, internal padding, platform-specific layout, endianness, etc.
We're using Protobuf with success. I ima
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gine Flatbuffers would also work well. I'd put Protobuf/Flatbuf and their competitors on the front of the tool shelf.