Stabilizing the libgd-gis Rendering API January 19, 2026 This article documents the current state of libgd-gis following a significant internal update: the stabilization and freeze of its core rendering API. The update consolidates the project’s primary responsibilities—static GIS rendering, layered composition, and post-render image manipulation—into a stable and documented surface. Alongside this milestone, comprehensive documentation…

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The libgd-gis library has stabilized its core rendering API for static GIS map generation in Ruby. The frozen API includes methods for rendering GeoJSON files, lines, polygons, and points, plus post-render image manipulation. Complete documentation is now available in English, Spanish, and Japanese. The stable API supports layered composition, configurable styling, and programmatic geometry rendering, while animated map rendering remains experimental in alpha-1.

Now Ruby GIS Rendering: Stabilizing the libgd-gis Rendering API

map.image — Post-render Image Manipulation