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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
  1. Install dependencies:
pip install -r requirements.txt
  1. 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