# bamzato/webgis-diy architecture

> Architecture diagram of the GitHub repository bamzato/webgis-diy, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-27). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/bamzato/webgis-diy
- Repository: https://github.com/bamzato/webgis-diy

## Overview

This is a browser-based map for exploring demographic information by administrative area. A user opens the map, selects a region to view its population, area, and density and zoom to its boundaries, or switches the basemap. The source shows the JavaScript handling the UI, GeoJSON loading, and Leaflet configuration; the HTML and stylesheet contents were not provided, so their detailed roles and wiring are uncertain.

Main entry points: [`js/app.js`](https://github.com/bamzato/webgis-diy/blob/main/js/app.js) (Map interactions), [`index.html`](https://github.com/bamzato/webgis-diy/blob/main/index.html) (Map page), [`css/style.css`](https://github.com/bamzato/webgis-diy/blob/main/css/style.css) (Page styling), [`data/diy-demografi.geojson`](https://github.com/bamzato/webgis-diy/blob/main/data/diy-demografi.geojson) (Region demographics)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_interface["Map interface"]
  node_page["Map page<br/>[index.html]"]
  node_styles["Page styling<br/>[style.css]"]
end

subgraph group_runtime["Map runtime"]
  node_app["Map interactions<br/>[app.js]"]
  node_leaflet["Leaflet"]
  node_topo["OpenTopoMap tiles"]
  node_osm["OpenStreetMap tiles"]
end

subgraph group_data["Geographic data"]
  node_geojson["Region demographics"]
end

node_user(("User"))

node_user -->|"uses map controls"| node_page
node_app -->|"updates controls"| node_page
node_app -->|"fetches regions"| node_geojson
node_app -->|"configures map"| node_leaflet
node_app -->|"configures tiles"| node_topo
node_app -->|"configures tiles"| node_osm
node_app -->|"toggles legend"| node_styles

click node_page "https://github.com/bamzato/webgis-diy/blob/main/index.html"
click node_styles "https://github.com/bamzato/webgis-diy/blob/main/css/style.css"
click node_app "https://github.com/bamzato/webgis-diy/blob/main/js/app.js"
click node_geojson "https://github.com/bamzato/webgis-diy/blob/main/data/diy-demografi.geojson"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_page,node_styles,node_user toneBlue
class node_app,node_leaflet,node_topo,node_osm toneAmber
class node_geojson toneMint
```

## Components

### Map interface

- [Map page](https://github.com/bamzato/webgis-diy/blob/main/index.html): `index.html`
- [Page styling](https://github.com/bamzato/webgis-diy/blob/main/css/style.css): `css/style.css`

### Map runtime

- [Map interactions](https://github.com/bamzato/webgis-diy/blob/main/js/app.js): `js/app.js`
- **Leaflet**
- **OpenTopoMap tiles**
- **OpenStreetMap tiles**

### Geographic data

- [Region demographics](https://github.com/bamzato/webgis-diy/blob/main/data/diy-demografi.geojson): `data/diy-demografi.geojson`

### Other components

- **User**

## Connections

- User → Map page: uses map controls
- Map interactions → Map page: updates controls
- Map interactions → Region demographics: fetches regions
- Map interactions → Leaflet: configures map
- Map interactions → OpenTopoMap tiles: configures tiles
- Map interactions → OpenStreetMap tiles: configures tiles
- Map interactions → Page styling: toggles legend