How did aerial photography change geographical mapmaking after World War II?

After World War II, aerial photography transformed geographical mapmaking by shifting from a primarily military reconnaissance tool to the dominant method for civilian and scientific cartography. This transition was driven by significant advancements in optics, cameras, and plotting equipment.12

Key changes included:

• Efficiency and Coverage: Aerial photography allowed for the rapid mapping of vast, previously inaccessible regions. Techniques like the trimetrogon method, developed during the war, enabled wide-area coverage that served as the foundation for global aeronautical charts.123
• Photogrammetry: The refinement of photogrammetry allowed cartographers to create accurate, three-dimensional models and contour maps from overlapping photographs. Sophisticated plotting instruments and, later, computers enabled the conversion of these images into precise, scaled maps.451
• Precision and Detail: Post-war developments in film quality, high-altitude flight, and specialized lenses improved the resolution and accuracy of maps. The use of orthophotoscopes further allowed for the creation of accurately scaled photomaps, which became essential for planning infrastructure and agricultural projects.234

These innovations made map production faster and more cost-effective, ultimately facilitating the global expansion of detailed topographic mapping.42