| --- |
| license: mit |
| tags: |
| - geospatial |
| - taxi |
| - new-york-city |
| - osrm |
| size_categories: |
| - 1M<n<10M |
| --- |
| |
| # Carbon Clock — Manhattan · Trip data |
|
|
| Trip data for [**The Carbon Clock — Manhattan**](https://github.com/NirmitSachde/the-carbon-clock-manhattan), a 24-hour animated visualization of NYC traffic, emissions, and air quality. |
|
|
| This dataset hosts the largest trip-tier binary that exceeds GitHub Pages' practical cross-origin limits. The smaller tiers (25 K / 100 K / 500 K) live in the repo itself. |
|
|
| ## File: `trips-2m.bin` |
|
|
| - **2,933,898 trips** — every yellow-taxi ride that started and ended in Manhattan during **January 2025** |
| - Source: [NYC TLC Yellow Taxi Trip Records](https://www.nyc.gov/site/tlc/about/tlc-trip-record-data.page) |
| - **2,933,750 trips routed through OpenStreetMap roads via OSRM v5** (148 kept their straight-line endpoints — 99.995% success) |
| - Geometry simplified with Douglas–Peucker (30 m tolerance) — preserves every turn, drops collinear noise |
| - 20,489,760 total waypoints, average 7.0 per trip |
| - Format: custom binary `CCM1` — Uint32 offset table + RGBA color per trip + Float32 [lng, lat, seconds-since-midnight] per waypoint |
| - ~40% the size of equivalent JSON |
| - Parses ~10× faster (zero JSON.parse cost; the points decode directly to a Float32Array that's pushed straight to the GPU as a Deck.gl `TripsLayer` data buffer) |
| - Size: ~257 MB |
|
|
| ## How it's used |
|
|
| The frontend at https://nirmitsachde.github.io/the-carbon-clock-manhattan/ fetches this file when the user selects the "Everything · 2.9 M" tier from the dropdown. Hugging Face's CORS headers make the cross-origin fetch work without any proxy. |
|
|
| ## License |
|
|
| MIT for the binary format and processing pipeline. The underlying taxi data is from NYC TLC and remains public domain. |
|
|
