Luis Sejer [Denmark]
DAENES
hej@luissejer.dk

Atlas

Where I’ve been, and when. A private map, just for me.

No. / Year
[02.1] 2026
Discipline
Data, map, Home Assistant
Type
Side project
Status
[Private]
The Atlas map: a paper map of inner Copenhagen with an ink track, numbered stays and a register of where and how long.
[Fig. 1] The map. The track, numbered stays and a register of where and how long. Shown with made-up data.

Home Assistant only remembers the last ten days. I wanted to look back years. So every time my phone sends a position, it goes on to a small server that keeps it for good, and the map draws it all in the same line as this site.

The system

  1. [01]

    iPhone

    GPS from the Home Assistant app

  2. [02]

    Home Assistant

    Passes every point on

    [A] Home Assistant keeps ten days. Atlas keeps everything.

  3. [03]

    Worker

    Cloudflare. Takes it in and checks the key

    [B] Two keys: the phone can only write, the map can only read.

  4. [04]

    D1

    Keeps every point for good

    [C] The same point is never stored twice, so syncing again is always safe.

  5. [05]

    Map

    MapLibre and D3, in paper and ink

Atlas analytics: number tiles, office hours per week, the week’s rhythm as a heatmap and travel by year.
[Fig. 2] Analytics. Where the time goes, the week’s rhythm and travel by year. Made up too.
Built with
Cloudflare Workers, D1, MapLibre, OpenFreeMap, D3, Home Assistant
Data
Every GPS fix from my phone. Older trips come from Passport.
Status
Private. The map sits behind a key, and nothing on this page is my real data.
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