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title: SatDetect - Satellite Change Detection
emoji: 🛰️
colorFrom: gray
colorTo: green
sdk: docker
app_port: 7860
---
# Satellite Change Detection — Standalone Web App
Standalone web application for satellite image change detection with **user accounts**, **database storage**, and a **clean, modern UI**.
## Features
- **Login / Register** — JWT-based auth, passwords hashed with bcrypt
- **Database** — SQLite (or set `DATABASE_URL` for PostgreSQL); stores users and detection runs
- **Change detection** — Same model as the original app: AI-based, image difference, feature-based, hybrid
- **Object classification** — Changed regions labeled as Water, Vegetation/Tree, Building, Road, Bare Ground/Soil
- **History** — List of past runs with overlay images and stats
- **UI** — Single-page app with a dark, “control room” style and teal accents
## Setup
1. **Create a virtual environment (recommended)**
```bash
cd change_detection_webapp
python -m venv venv
source venv/bin/activate # Windows: venv\Scripts\activate
```
2. **Install dependencies**
```bash
pip install -r requirements.txt
```
3. **Run the app**
```bash
uvicorn app.main:app --reload --host 0.0.0.0 --port 8000
```
4. Open **http://localhost:8000** in your browser.
## First run
- The SQLite DB and `data/` (overlay images) are created automatically on first use.
- Register a new account from the welcome screen, then sign in.
- Upload **Before** and **After** images, choose a method, and click **Run detection**.
- Results appear below; runs are saved in **History**.
## Configuration
- **Database**: set `DATABASE_URL` (e.g. `postgresql://user:pass@host/db`) to use another DB; otherwise SQLite under `data/satellite_app.db` is used.
- **JWT**: set `SECRET_KEY` in `app/auth.py` (or via env) in production.
## Project layout
```
change_detection_webapp/
├── app/
│ ├── main.py # FastAPI app, routes
│ ├── database.py # SQLAlchemy, session
│ ├── models.py # User, DetectionRun
│ ├── auth.py # JWT, password hashing
│ └── detection_engine.py # Change detection (no Streamlit)
├── static/
│ ├── css/style.css # Styles
│ └── js/app.js # Frontend logic
├── templates/
│ └── index.html # Single-page UI
├── data/ # Created at runtime (DB + overlays)
├── requirements.txt
└── README.md
```
## API (for integration)
- `POST /api/auth/register` — body: `{ "email", "password", "full_name" }`
- `POST /api/auth/login` — body: `{ "email", "password" }` → returns `access_token`
- `GET /api/me` — header: `Authorization: Bearer <token>`
- `POST /api/detect` — form: `before`, `after` (files), `method`, `title`, etc. → returns stats, regions, overlay base64
- `GET /api/history` — list of current user’s runs
- `GET /api/overlay/<path>` — serve saved overlay image
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