Between the 1920s and the 1940s, the Netherlands became a leader in the use of aerial photography. The flat landscape and the constant battle against water made a view from the sky extremely valuable for engineers and planners. In the 1920s, the Royal Netherlands Army Air Force began taking thousands of vertical and oblique photos to create more accurate maps of the provinces. These images allowed the government to track the growth of cities and the changing shape of the coastline with a level of detail that ground surveys could not match.
During the 1930s, aerial photography was essential for the Zuiderzee Works. Specialists used cameras mounted on airplanes to monitor the construction of the Afsluitdijk and the drying of the new polders. These photos helped engineers see how the water currents moved and where the new dikes needed more reinforcement. By the 1940s, technology was used for both military planning and the reconstruction effort. Aerial surveys taken immediately after the liberation in 1945 provided a precise record of the damage to bridges and railways. This visual data allowed the “Wederopbouw” teams to prioritize the most urgent repairs and plan the modern layout of cities like Rotterdam.