We recently published a paper describing our efforts to adapt street audit strategies for use in a large informal community, Rio das Pedras (RdP) located in Rio de Janeiro, Brazil.  We developed a smartphone-based systematic observation protocol to gather street-level information for a high-density convenience sample of street segments in RdP (N = 630, estimated as 86% of all street segments in the community).  The street audit protocol was built on the Fulcrum app deployed on smart phones and allowed street auditors to record observational data into forms on the phone’s screen and to capture geotagged images from the phone’s camera. The app also had a mapping interface to help guide the field team around RdP to the selected street segments that were being audited.