January 13, 2026 Rivers of Europe and Entre Ríos rendered directly in Ruby Today marks a major milestone for libgd-gis: we crossed from “experimental map renderer” into a real GIS-grade drawing engine. Using nothing but Ruby + libgd, we are now able to render continent-scale river networks, provincial hydrology, and complex GeoJSON layers with proper…

RubyFlow's platform is a resource for Ruby developers, offering insights into Ruby programming language, Ruby on Rails framework, and Ruby-related tools. Through articles, tutorials, and community discussions, RubyFlow offers insights into building web applications with Ruby and Rails. Developers can learn about Ruby gems, Rails conventions, and best practices in Ruby development to write clean and maintainable code.

Ruby Flow

libgd-gis has evolved from an experimental tool into a production-grade GIS rendering engine for Ruby. It can now render continent-scale river networks, provincial hydrology, and complex GeoJSON layers with proper classification and styling, all within a single Ruby process. The library introduces semantic layer classification that understands feature types (rivers, canals, lakes), supports multi-stroke rendering with transparency, and enables Rails applications to generate maps without external GIS engines like QGIS or JavaScript-based solutions. This opens possibilities for hydrology maps, environmental dashboards, flood modeling, and spatial reports directly in Ruby.

libgd-gis moves into serious cartography territory