By the late 1960s, US government officials wanted to explore how the Lockheed U-2 aircraft could be used for civilian purposes. Earlier, these planes were used mainly for military and intelligence work, with only limited support for civilian missions. In 1968, intelligence officer Arthur C. Lundahl suggested a system to provide declassified aerial images for emergencies and resource management. At the same time, many early U-2 planes were no longer needed for their main missions and were put into storage. In early 1970, the Deputy Director of the National Reconnaissance Office, F. Robert Naka, led studies to review the Lockheed U-2 fleet. The studies found that newer aircraft could meet current needs, allowing older U-2C and U-2G models to be reassigned. On March 16, 1970, the National Reconnaissance Office (NRO) proposed to NASA that the U-2 aircraft could be used for Earth observation because of its high-altitude capabilities and longer flight time. NASA agreed and planned to use two U-2s, and Marty Knutson, who had experience flying the U-2, became the project manager to set up flight operations. Lockheed modified two aircraft that had been in storage, removing naval landing equipment to make them lighter. The planes were then given civilian registrations. In June 1971, NASA received the aircraft at the Ames Research Center. After some initial flights, the first official mission occurred on August 31, 1971. By the mid-1970s, the two Lockheed U-2 aircraft were completing about 100 missions per year. By 1978, both had accumulated over 4,000 flight hours.
The U-2 aircraft, based in California, operated from various locations, including Wallops Island, Hawaii, Alaska, and Panama. It helped in missions such as land-use surveys, disaster assessments, environmental monitoring, and satellite support. State and federal agencies used U-2 images to measure water levels in rivers and reservoirs, study tidal patterns and water movement, track wildfires, efficiently use personnel and equipment, and protect forest watersheds and wildlife habitat. High-altitude photography also helped with mapping and urban planning. One major mission for NASA was using the Lockheed U-2 as a flexible sensor platform. The researchers installed cameras and instruments in modular packages, allowing for quick changes between missions. The aircraft carried large-format cameras with various focal lengths and film types. From over 60,000 feet in the air, these cameras captured wide-area images with high resolution. Infrared film helped researchers evaluate the health of plants and see features that were not visible to the human eye. Multispectral imaging provided additional data for research on land and environmental issues. The U-2 aircraft also carried non-photographic tools such as scanners, radiometers, atmospheric samplers, and so on. Many of these tools were developed by NASA centers and universities. In the early 1970s, NASA conducted a research project using the Lockheed U-2 aircraft to take low-resolution, multispectral photographs of selected ecosystems. The project aimed to mimic the data system called Return Beam Vidicon (RBV), which was being developed for the Earth Resources Technology Satellite, later known as Landsat 1. The U-2 also played a role in atmospheric research. Instruments on the U-2 measured gases and particles in the stratosphere at heights up to 65,000 feet, helping scientists study ozone, pollution, and atmospheric chemistry. Sampling missions took place over different regions, including polar and equatorial areas.
By the mid-1970s, the Lockheed U-2 program included global missions. Flights took place in Alaska, Hawaii, Panama, and other locations. The aircraft helped with mapping programs, including large surveys of Alaska. It also helped in studying wetlands, forests, and agricultural areas. Later, real-time imaging systems were added, which allowed data to be sent directly to ground stations during disaster response missions. The U-2 was used as a research aircraft in the 1970s and 1980s before being replaced by the ER-2s. However, from its service with NASA beginning in 1971 through its retirement, the U-2 provided high-altitude access for sensors and experiments that other aircraft could not carry. The aircraft also supported work in remote sensing, atmospheric science, natural disaster prevention measures, and satellite development. The Lockheed U-2 aircraft could fly for long times at high altitudes, making it useful for data collection. As a result, a reconnaissance aircraft, such as the U-2, could be used to contribute to scientific research. In the Flight Test Files series, the Lockheed U-2 aircraft stands out for providing data that helped improve Earth observation systems and environmental studies, which remain important today. Read more Flight Test Files articles HERE.
