Introduction to Web Cartography: Technologies and Best Practices

Web cartography has revolutionized the way we interact with geographic data. Once reserved for GIS specialists equipped with expensive software, creating interactive maps is now accessible to any web developer thanks to powerful open source frameworks and standardized APIs. At MapWay, we master these technologies on a daily basis to design custom cartographic solutions in Tunisia and internationally.

What is web cartography?

Web cartography, or web mapping, refers to all the techniques used to display, manipulate, and analyze geographic data directly in a web browser. Unlike static paper maps, web maps are interactive: users can zoom, pan, click on elements to get contextual information, and even modify the displayed data in real time.

This discipline sits at the intersection of several fields: geomatics (the science of geographic information), front-end web development, user interface design, and spatial database management. It therefore requires cross-functional skills that our team at MapWay has developed through numerous projects, notably with our platform TMaps.tn.

Fundamental technologies

1. Map Tiles

The tile principle is at the heart of modern web cartography. Rather than loading a single gigantic image representing the entire world, the map is divided into small square images (typically 256x256 pixels) organized in a hierarchical grid system. At each zoom level, the number of tiles quadruples, progressively offering more detail.

There are two main types of tiles:

• Raster tiles : pre-rendered PNG or JPEG images on the server side. Simple to set up, but heavy on bandwidth and limited in terms of styling flexibility.
• Vector tiles : encoded geometric data (often in PBF/MVT format) that the browser renders client-side via WebGL. Lighter, fully customizable, and suited for high-resolution displays.

2. JavaScript cartographic frameworks

Several JavaScript libraries make it easy to integrate interactive maps into a web application:

• Leaflet : lightweight (~40 KB), easy to learn, ideal for simple maps with markers and popups. Its plugin ecosystem is vast.
• OpenLayers : more comprehensive and powerful, suited for professional GIS applications requiring various projections and advanced interactions.
• MapLibre GL JS : an open source fork of Mapbox GL JS, it leverages WebGL for ultra-performant vector rendering with JSON-customizable styles.

3. OGC standards

The Open Geospatial Consortium (OGC) defines essential standards for geographic data interoperability: WMS (Web Map Service) for serving map images, WFS (Web Feature Service) for accessing vector data, and WMTS (Web Map Tile Service) for pre-computed tiles. These standards ensure that different systems can communicate with each other, a crucial aspect in large-scale projects.

Geographic data sources

The quality of a map depends above all on the quality of its data. Here are the main available sources:

• OpenStreetMap (OSM) : the world's largest collaborative geographic database, free and open-licensed. In Tunisia, the OSM community is active and the data covers urban areas well.
• Government data : the Office of Topography and Cadastre (OTC) in Tunisia provides official data, although its digital accessibility remains improvable.
• Satellite imagery : services like Sentinel (ESA's Copernicus program) offer free and regularly updated satellite images.
• Business data : each organization's own data (customer addresses, points of sale, delivery routes) often constitutes the most valuable layer of a cartographic project.

Best practices for your cartographic projects

Performance and optimization

A slow-loading map will lose its users. To optimize performance, favor vector tiles for large amounts of data, implement clustering for numerous markers, and use lazy loading for secondary layers. On mobile, reduce the number of simultaneous interactions and optimize asset sizes.

Accessibility

Web maps pose particular challenges in terms of accessibility. Ensure that essential information is also available in text form, add relevant ARIA attributes, and provide keyboard navigation. Color contrasts must comply with WCAG standards, especially for colorblind users.

Responsive design

In 2025, over 60% of web traffic comes from mobile devices. Your map must adapt seamlessly to different screen sizes. Adjust zoom controls, simplify touch interactions, and consider different views for mobile and desktop. At MapWay, we systematically design our cartographic solutions with a mobile-first approach.

MapWay's expertise in web cartography

At MapWay, web cartography is in our DNA. Our platform TMaps, certified under the Startup Act, demonstrates our ability to develop innovative and high-performance cartographic solutions. From our geolocation tool Houni.tn to our postal code service Code-Postale.tn, we leverage all the technologies presented in this article on a daily basis.

Whether you want to integrate a simple location map on your website or develop a complete GIS application, our team of experts is ready to support you in your cartographic project in Tunisia.