The Urban Canyon FDTD model is intended for high-rise urban environments where the transmitting and receiving antennas are located close to the ground relative to the building heights. For these situations, buildings can be modeled as being infinitely tall, and the interactions with the buildings are entirely determined by the 2D ground level perimeters, or footprints, of the buildings. Urban Canyon FDTD simulates radio propagation by using the finite-difference time-domain (FDTD) method to directly solve Maxwell's equations.