Under the 2014–2017 Islamic State of Iraq and Syria (ISIS) occupation, the Old City of Mosul, Iraq, served as a headquarters for the self-proclaimed caliphate. ISIS produced, stored, and transited money, modern munitions, weapons, and improvised explosive devices (IEDs) through the city's ancient stone streets. To approach the immense and technically challenging task of clearing the Old City efficiently, effectively, and safely—without compromising the city's rich cultural history—Tetra Tech created a 3D model using aerial photogrammetry to quantify and visualize the scope and scale of the project.



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