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Baseline Tool - User Documentation

Overview​

The Baseline Tool in QGIS allows users to create baseline geometries (lines or circles) based on a user-defined distance. This tool helps in digitizing and mapping linear and circular features with precision.

Features​

  • Supports line and circle geometries.
  • Allows users to enter a specific distance value for precise placement.
  • Provides snapping to existing features for accurate alignment.
  • Includes a preview mode before finalizing the geometry.
  • Supports multiple measurement units:
    • Meters
    • Metric Links
    • Guntur's Links

How to Use​

1. Activating the Tool​

  1. Click on the Baseline Tool in the QGIS toolbar.
  2. The tool will be activated, and the mouse cursor will change accordingly.

2. Selecting a Start Point​

  1. Left-click on the map to select the starting point for the baseline.
  2. The tool will highlight the chosen location with a green marker.

3. Entering Distance and Selecting Geometry​

  1. A dialog box will appear prompting you to enter the distance.
  2. Select the desired unit of measurement.
  3. Choose the geometry type:
    • Line: A straight segment of the specified distance.
    • Circle: A circular feature with the given radius.
  4. Click OK to confirm.

4. Previewing the Geometry​

  • Move the cursor to see a preview of the feature.
  • The tool will display:
    • A dashed line for line geometry.
    • A dashed circle for circular geometry.
  • If needed, right-click to cancel the operation.

5. Finalizing the Geometry​

  1. Left-click again to confirm the geometry.
  2. The feature will be added to the Baseline layer.
  3. The tool will automatically reset for a new operation.

Additional Features​

  • Snapping Support: The tool will snap to existing features based on QGIS's snapping settings.
  • Length Attribute: Each feature stores its measured distance in the attribute table.
  • Undo Support: If needed, remove the last created feature and retry.

Troubleshooting​

1. Distance Input Issues​

  • Ensure that the entered distance is greater than 0.
  • Check that the distance value is within valid range (0.01 - 10,000 meters).

2. Snapping Not Working​

  • Verify that snapping is enabled in QGIS settings.
  • Adjust snapping tolerance for better results.

3. Feature Not Created​

  • Ensure that the Baseline layer is editable.
  • If an error occurs, check the QGIS message bar for details.

Conclusion​

The Baseline Tool is a powerful QGIS extension for efficiently creating linear and circular baseline features. By allowing precise distance input and real-time preview, this tool enhances the digitization workflow.

For further assistance, refer to the QGIS help documentation or seek support from the development team.