The document discusses the development of an interactive mapping application for the Long Island Index project using a hybrid "geo stack" approach. It combines proprietary ESRI ArcGIS software to manage spatial data with open source mapping libraries like OpenLayers to display interactive maps in the browser. The result is a website that allows users to visualize and explore socioeconomic and environmental indicators for communities on Long Island. It leverages different technologies to provide an easy-to-use and intuitive mapping experience while maintaining control over spatial data and cartography.