FOSS4G 2023 Prizren Gleo is a nascent javascript WebGL mapping library. It aims to find a niche alongside Leaflet, OpenLayers, MapLibre and Deck.gl.

This library was presented at FOSS4G 2022, with an emphasis on its architectural foundations: geometry/reprojection/antimeridian handling, and object-oriented abstractions for WebGL data structures.

This session provides a tour of the features developed during the last year. These include, among others:

• Work done as part of the OSGeo-OGC codesprints (OGC API clients, experimental symbols)
• Animated symbols (render loop)
• Symbol class decorators (ability to add more functionality to a cartographic symbol class during runtime)
• Flexibility of scalar field manipulation (symbols that render as a magnitude instead of a colour, then the field renders as e.g. a heatmap)