libgd-gis is a native GIS and map-rendering engine for Ruby built on top of ruby-libgd. It lets Ruby applications generate map images, tiles, and geospatial visualizations directly from latitude/longitude data — without external map servers or image pipelines. - ggerman/libgd-gis

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libgd-gis is a native GIS and map-rendering library for Ruby built on top of libgd. It enables Ruby and Rails developers to generate static map images, tiles, and heatmaps directly from GeoJSON without relying on external services. Key features include Web Mercator tile rendering with support for OSM, CARTO, and ESRI basemaps, CRS normalization across multiple coordinate systems, YAML-based styling, layered rendering pipeline, and predefined geographic extents for regions and continents. Installation is via RubyGems and requires the GD system library.

GitHub - ggerman/libgd-gis: libgd-gis is a native GIS and map-rendering engine for Ruby built on top of ruby-libgd. It lets Ruby applications generate map images, tiles, and geospatial visualizations 