Overhead view of Butterfield Elementary School pedestrian transportation zones. The yellow zone is the area in which a student can walk one mile staying on the sidewalks. The blue zone shows the area in which a student can walk for 15 minutes by staying on the sidewalks. The purple triangles are impedance points indicating where the student may need to cross the street or wait for a traffic signal to change.

3D Visualization of sidewalk condition, location, and altitude. A 3D visual map created using a Digital Elevation Model (DEM), including the city’s building footprints, roads, sidewalk data, and school districts. Sidewalk distance (yellow area) shows the distance a student can travel from his/her school following a sidewalk without having to cross any major highways or impedance zones. Sidewalks that were inaccessible from the sidewalk network were not included in the Sidewalk distance area. Sidewalk data collected by the CADIS team in the summer of 2003. (Jessica McCullough, Greg Seltz, Sarah Gibson, Ryan Love, Nathan O’Brian,)