Build a working reporting app in three hours: pick a location, submit a report, and publish it to a map using Re:Earth CMS and Leaflet. Guided code and a ready backend are provided — no prior GIS, CMS, or backend experience needed, just basic HTML and JavaScript.

Ask in plain language — “color Japanese municipalities by prefecture” — and an AI agent runs SQL and paints the map, entirely in your browser. A 3-hour workshop that takes an LLM × GIS agent apart (DuckDB-WASM, MapLibre GL, Vega-Lite, Claude) and rebuilds it one layer at a time.