The Long Island Zoning Atlas is an interactive web map that displays zoning data, public services, and demographic data for municipalities all across Long Island excluding New York City. The app focuses on statistics that help affordable housing advocates plan housing projects. This year we rebuilt the Long Island Zoning Atlas using our new FOSS stack. The project presented a problem very common to GIS projects: transforming data from many different sources, in this cases towns. They were given the data in many different formats and needed to transform it all into clean, usable data which is organized to our needs and renders quickly and efficiently on the web.