GML to IFC Converter - Streamlit App

A simple web application for converting GML (Geography Markup Language) files to IFC4X3 format.

Features

• 🎯 Simple Interface: Single-page app with drag-and-drop file upload
• 📁 Batch Processing: Convert multiple GML files at once
• 📥 Easy Download: Download individual files or all as a ZIP archive
• ⚙️ Configurable: Adjust EPSG codes and MapConversion settings
• 📊 Visual Feedback: See coordinate bounds and processing status

Installation

Local Development

1. Clone the repository:

git clone https://github.com/YOUR_USERNAME/gml-to-ifc-converter.git
cd gml-to-ifc-converter

2. Install dependencies:

pip install -r requirements.txt

3. Run the app:

streamlit run app.py

The app will open in your browser at http://localhost:8501

Deployment

Streamlit Community Cloud

1. Push your code to GitHub
2. Go to share.streamlit.io
3. Connect your GitHub repository
4. Deploy!

Docker

docker build -t gml-to-ifc-converter .
docker run -p 8501:8501 gml-to-ifc-converter

Usage

1. Upload GML Files: Click "Browse files" or drag and drop your GML files
2. Configure Settings (optional): Expand the settings panel to adjust:
   • Default EPSG code
   • MapConversion toggle
3. Download Results:
   • Single file: Direct download button
   • Multiple files: Download as ZIP or individual files

Technical Details

• Input Format: GML files with polygon geometry
• Output Format: IFC4X3 with IfcBuildingElementProxy objects
• Coordinate Systems: Automatic EPSG detection or configurable default
• Geometry: Creates proper 3D surface models with face-based geometry

Configuration

Edit the following constants in app.py:

DEFAULT_EPSG_CODE = 25832  # Default EPSG code if not found in GML
USE_MAP_CONVERSION = False  # Enable/disable MapConversion

Requirements

• Python 3.8+
• streamlit
• ifcopenshell

License

MIT License

Author

Victor Budinic