Creating Interactive Web Maps with QGIS and the qgis2web Plugin

Creating web maps is an essential skill for anyone involved in Geographic Information Systems (GIS). Traditional methods of sharing maps often require complex file management and the need for recipients to have specific software. However, with the qgis2web plugin in QGIS, you can easily convert your geospatial data into interactive web maps that can be shared and accessed through any web browser. In this guide, we will walk through the process of setting up QGIS, installing the plugin, adding data, customizing the map, and exporting it as a web map.

Getting Started with QGIS

The first step in creating a web map is to ensure you have QGIS installed on your computer. Once QGIS is up and running, the next step is to install the qgis2web plugin. This powerful tool allows users to export their QGIS projects as web maps without needing to write any code.

Installing the qgis2web Plugin

To install the qgis2web plugin, follow these steps:

1. Open QGIS and navigate to the menu bar.
2. Click on Plugins, then select Manage and Install Plugins.
3. In the search bar, type qgis2web.
4. Select the plugin and click Install Plugin.

After installation, you can close the plugins window. The qgis2web plugin will now be available in the Web menu.

Adding Data Layers

Before creating your web map, you need to add geospatial data layers. In this example, a state population layer will be used. You can create this layer yourself or use existing data.

Creating Graduated Symbology

Once the data layer is added, it’s important to configure the symbology to effectively communicate the information. Graduated symbology is useful for visualizing quantitative data, such as population estimates.

1. Select the layer and right-click to access properties.
2. Navigate to the Symbology tab.
3. Choose Graduated from the drop-down menu.
4. Select the appropriate value field (e.g., population estimate for 2019).
5. Choose a classification method, such as Equal Interval or Equal Counts.

After configuring the symbology, your map will visually represent the population data across different regions.

Creating the Web Map

With your data layers added and styled, it’s time to create the web map using the qgis2web plugin. This process involves several steps to ensure your map is interactive and user-friendly.

Launching the qgis2web Plugin

To create your web map:

1. Navigate to the Web menu and select qgis2web, then click on Create a web map.
2. A window will appear with options to configure your map layers and settings.

Configuring Map Layers and Pop-ups

In the qgis2web window, you will see options for Layers and Groups. Each layer can be configured for visibility and interactivity:

• Make layers visible.
• Enable pop-ups to display attribute data when features are clicked.

To see a preview of your map, click the Preview button. This will show you how your map will look in the browser.

Choosing Mapping Libraries

qgis2web supports three different web mapping libraries: OpenLayers, Leaflet, and Mapbox. Each library has its strengths, and your choice may depend on your specific needs.

• OpenLayers: A powerful library for complex maps, ideal for users needing extensive features.
• Leaflet: Lightweight and user-friendly, perfect for simpler web maps.
• Mapbox: Requires an API key but offers beautiful, customizable maps.

For most users, OpenLayers or Leaflet is recommended, as they are open source and do not require additional costs.

Customizing Map Appearance

Customization enhances user experience. In the qgis2web window, you can:

• Add a search bar for easy navigation.
• Enable geolocation to show users their current location.
• Highlight features when hovered over.
• Include measurement tools for users to calculate distances and areas.

Selecting Attributes to Display

Decide which attributes from your data layers to display in pop-ups. This can help users understand the data better. Select relevant attributes and ensure they are clear and concise.

Exporting the Web Map

Once you are satisfied with your map’s configuration and appearance, it’s time to export the web map. This process creates an HTML file that can be opened in any web browser.

1. In the qgis2web window, navigate to the Export tab.
2. Choose a folder to save your web map files.
3. Click on the Export button.

This will generate a folder containing the necessary files, including an index.html file that serves as the main entry point for your web map.

Viewing Your Web Map

To view your newly created web map, navigate to the folder where you exported the files. Open the index.html file in a web browser. You should see your interactive map, complete with pop-ups and all configured settings.

Troubleshooting Interactive Features

If certain features, like pop-ups or clicks, are not functioning as expected, revisit the qgis2web settings. Ensure that pop-ups are enabled and that the correct attributes are selected for display.

FAQ

What is qgis2web?

qgis2web is a QGIS plugin that allows users to export their QGIS projects as interactive web maps without writing any code.

Do I need to know how to code to use qgis2web?

No, qgis2web is designed for users without coding experience. It provides a user-friendly interface to create web maps.

What mapping libraries can I use with qgis2web?

You can use OpenLayers, Leaflet, or Mapbox to create web maps with qgis2web.