Data Visualization - Legend Patch Shapes

Introduction

In this tutorial, we will explore how to add legend patch shapes to QGIS, create custom shapes, and effectively use them in a map legend. Understanding how to manipulate legend items can enhance the clarity and visual appeal of your maps, making it easier for viewers to interpret the data presented.

Step 1: Accessing the Legend Settings

• Open your QGIS project.
• Locate the Layers Panel where your data layers are displayed.
• Right-click on the layer for which you want to modify the legend.
• Select Properties from the context menu.

Step 2: Modifying Symbol Styles

• In the Layer Properties window, navigate to the Symbology tab.
• Here, you can change the symbol style to match your desired legend patch shape.
• Click on the symbol icon to open the Symbol Selector dialog.
• Choose the shape you prefer from the available options or customize your own by adjusting the parameters.

Step 3: Creating Custom Legend Patch Shapes

• To create a custom shape, go to the Symbol Selector in the Symbology tab.
• Select SVG Marker if you want to use a pre-existing shape or Simple Marker to create a basic geometric shape.
• Adjust the Size and Rotation parameters to fit your needs.
• If you want to use a specific SVG file:
  • Click on the SVG option in the Symbol Selector.
  • Browse to select your custom SVG file.

Step 4: Applying Changes to the Legend

• After configuring your shapes, click OK to apply the changes.
• Open the Print Layout by navigating to Project > New Print Layout.
• Add your map to the layout by dragging it from the Item panel.
• To add the legend, select the Add Legend tool from the toolbar and click on the layout where you want the legend to appear.

Step 5: Customizing the Legend Appearance

• Click on the added legend to access its properties.
• In the Item Properties panel, you can adjust:
  • Legend title
  • Font size and style
  • Spacing between items
• Ensure that the custom shapes you created are correctly displayed in the legend.

Step 6: Finalizing and Exporting Your Map

• Review your layout to ensure everything looks good.
• If adjustments are needed, click back on the legend or map to make changes.
• Once satisfied, export your map to your desired format by going to Layout > Export as Image or PDF.

Conclusion

You have now learned how to add and customize legend patch shapes in QGIS effectively. By following these steps, you can enhance the visual communication of your maps. As a next step, consider experimenting with different shapes and layouts to find what works best for your specific project. Happy mapping!