This document discusses different options for creating thematic maps using open source tools, including in the browser, via cloud-based mapping services, and by hosting mapping capabilities on your own network. Mapping in the browser is the simplest approach but has limitations in terms of functionality and compatibility. Cloud-based mapping services provide high customization but require a vendor relationship and data is hosted externally. Hosting mapping capabilities yourself provides full customization and control over infrastructure and data security but requires more development effort and ongoing maintenance.