The SIM (Semantic Interior Mapology) web tool has been launched online for anyone to use. Using SIM’s intuitive interface, you can quickly and precisely trace the layout of a building starting from an existing map. SIM then produces a digital representation of the building’s interior in GeoJSON (a standard format), and renders it in 3-D on a regular web browser. SIM can be used to generate interactive visualizations of real estate, or to model building interiors for applications in robotics and location-aware services. SIM was developed by Viet Trinh, a Computer Engineering Ph.D. candidate in the Computer Vision Lab at the UCSC Baskin School of Engineering. Viet uses SIM to generate embossed maps of buildings for people who are blind.