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Improving Algorithms for Simplifying Geographic Polygons

2025-08-30

This article explores algorithms for simplifying geographic polygons, specifically their convex hulls. The current approach combines the Douglas-Peucker algorithm with polygon offsetting: the polygon is first offset outwards to eliminate details, then simplified using Douglas-Peucker, and finally offset inwards. However, this method isn't optimal for convex features. The author seeks more efficient algorithms to achieve higher-quality geometry at the same size or further reduce size without compromising quality.

Contribute to Transitous: An Open Source Public Transit Routing Service

2025-06-16

Transitous, a community-run public transport routing service built on the MOTIS engine and thousands of global datasets, powers features in apps like GNOME Maps. This post details how to contribute data improvements: First, verify Transitous data against reality; then, learn how to add and improve GTFS static data, GTFS Realtime data (including trip updates, service alerts, and vehicle positions), GBFS shared mobility data, and GTFS-Flex on-demand service data. Finally, it encourages contributions to OpenStreetMap data, particularly indoor floor level information. Transitous welcomes contributions of all kinds, whether code, data, math, transportation expertise, or IT operations.