Claude Code · Anthropic
Build a live traffic and flood map in a day from open data
A Thai tech founder told a Claude meetup he used Claude Code to build a 3D Bangkok map of traffic and flooding within 24 hours, without Google's map API, using a second AI to check the work.
What they did
The build pulled OpenStreetMap, Open-Meteo and Thaiwater data, and used computer use to read hard-to-parse weather sites and turn them into plain summaries. He set up a workflow with separate build and validation steps, reviewed the architecture decision records himself, and had Claude write progress to a file and clear its context at around 60% full. Claude Code did most of the coding, Codex handled the 3D parts, and another model reviewed the output, with an AGENTS.md file so every tool shared the same project structure.
How it went
The speaker says the working map was done within the 24-hour challenge, a job he contrasts with how hard a flood site was to build years ago.
Worth knowing
This was a personal challenge project described at a meetup, not a commercial deployment, and it is reported through an attendee's recap. Data accuracy and upkeep are not discussed.
Try it with Claude Code
Build a web map of <city> that shows <first data layer> and <second data layer> using only open data sources such as <data sources>. First write a short plan and architecture decision record for me to approve. Then build in small steps, run checks after each one, and when your context gets long, write progress to PROGRESS.md before continuing.
Swap the parts in angle brackets for your own details. This prompt is adapted from the case, not copied from the original.
What this label means: User story
Someone using it at work posted about it. Any numbers are theirs, so we write "the poster says".
Summarised from the original source; the link has the full story. The people and companies here are not Wize customers.