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gprMax is open source software that simulates electromagnetic wave propagation. It uses Yee's algorithm to solve Maxwell’s equations in 3D using the Finite-Difference Time-Domain (FDTD) method.

It is designed for simulating Ground Penetrating Radar (GPR) and can be used to model electromagnetic wave propagation in fields such as engineering, geophysics, archaeology, and medicine. There are a wide range of applications including: assessing critical infrastructure such as bridges and roads, locating buried utilities, mapping glaciers, finding anti-personnel landmines, and detecting tumours in the human body.