Cable latency survey hand-off: v1 + v2 data and report

2026-10-24 00:19:41 -04:00
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 # Cable latency survey — data hand-off
 Deep-sea cable latency survey: measured latencies between sites, published cable geometry, and the routed path for every pair on four map models.
 | File | Size | What it is |
 |---|---|---|
 | `cable_latency_survey_data_v2.json` | 39.9 MB | **Current.** 29,341 measurements, 305 sites. Adds `cable_geometry` (608 cables, drawn routes and landing points as `[lon, lat]`) and `cable_routes` (the point-by-point path behind every cable-route distance, each step tagged cable / cable-to-shore / overland). Replaces v1; the `revision` block lists what changed. |
 | `cable_latency_survey_data.json` | 20.4 MB | v1. Same measurements, cable lengths and route names, but no coordinates. Kept for reference. |
 | `cable_latency_survey_report.html` | 2.6 MB | Self-contained report. Open in a browser. |
 Top-level keys in the v2 JSON: `dataset`, `generated_utc`, `revision`, `constants`, `maps`, `test`, `sources`, `summary`, `sites`, `excluded`, `cable_crossings`, `cables`, `cable_geometry`, `cable_routes`, `flat_map_solver`, `measurements`.
 Every stored distance in v2 recomputes from the coordinates in the file to within 0.05 km. Overland legs are straight lines and may cross water; that only shortens routes.
 Download a single file with the download button on its page, or clone:
 ```
 git clone https://git.aethercosmology.com/toby/cable-latency-survey.git
 ```