Historically, access to the Homeland Infrastructure Foundation-Level Data (HIFLD) has been restricted to applicants meeting a variety of criteria, such as working for a federal government agency, or state emergency management agency. With the release of their new ArcGIS Online Open Data website, the HIFLD has made data previously contained within the Homeland Security Infrastructure Program (HSIP) databases available, and open, to the public.
Currently available are over 270 public datasets that are downloadable in a variety of useful formats, such as CSV, KML, and Shapefiles. These are also all available as APIs, such as GeoJSON and GeoServices for easy compatibility with web applications.
There are a wide variety of data categories to choose from, ranging from Agricultural data, to Energy data, to water supply data. All data is downloadable, either as a full dataset, or as a filtered dataset (i.e. you can filter for features only occurring in Rhode Island and download those).
Prior to downloading data, users can read brief dataset descriptions, explore the attribute table, and view the data in an interactive web map. Once downloaded, users have access to full metadata records.