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🔄 UML Flowchart Diagram with Explanation: EGNSS4CAP iOS App Workflow#

This flowchart captures the overall functional workflow of the EGNSS4CAP iOS application and provides an explanation for each step.

🧩 Mermaid Flowchart Diagram#

flowchart TD
    A[App Launch] --> B[MainViewController Loads]
    B --> C{User Action?}

    C -->|Start GNSS| D[GNSSReceiver Starts Tracking]
    C -->|Open Map| E[MapViewController Displays Map]
    C -->|Capture Photo| F[CameraViewController Opens Camera]
    C -->|Settings| G[SettingsViewController Opens Settings]

    D --> H[Get GNSS Fix]
    H --> I[Attach Fix to Metadata]
    I --> J[Pass Data to CameraViewController]

    F --> J
    J --> K[Capture Photo with Metadata]
    K --> L[Save Image to Local Storage]

    E --> M[Display User Location]
    M --> N[Display Satellites]

    G --> O[Load/Save Preferences]

    L --> P{Generate Report?}
    P -->|Yes| Q[PDFCreator Generates Report]
    Q --> R[Export PDF]

📖 Explanation#

🔹 App Launch & Main Controller#

  • The app begins by loading the MainViewController, which acts as a central point for user interaction.

🔹 User Action Options#

  • Start GNSS: Triggers the GNSS receiver to begin capturing location data.
  • Open Map: Loads the map view for user interaction and satellite visualization.
  • Capture Photo: Opens the camera interface for taking geotagged photos.
  • Settings: Opens app preferences through the SettingsViewController.

🔹 GNSS Workflow#

  • The GNSSReceiver obtains GNSS data and provides a fix.
  • The fix is processed, attached as metadata, and passed to the camera for inclusion in photos.

🔹 Camera Integration#

  • The photo is captured with GNSS metadata embedded.
  • The image is then saved locally on the device.

🔹 Map Interaction#

  • The map shows the user's location and optionally displays satellite data.

🔹 Preferences#

  • Users can load or modify their preferences within the settings interface.

🔹 Report Generation#

  • After capturing and saving data, users can choose to generate a report using PDFCreator.
  • The report is then exported as a PDF document.

✅ Key Benefits#

  • Ensures trusted geolocation with GNSS integration.
  • Streamlined workflow from data collection to reporting.
  • Supports multiple modules while maintaining centralized user control.