Spy-satellite images offer insights into historical ecosystem changes | Science & Technology

A large number of historical spy-satellite photographs from the Cold War Era were declassified decades ago. This valuable remote sensing data has been utilised by scientists across a wide range of disciplines from archaeology to civil engineering. However, its use in ecology and conservation remains limited. A new study led by Dr. Catalina Munteanu from the Faculty of Environment and Natural Resources at the University of Freiburg, Germany, aims to advance the application of declassified satellite data in the fields of ecology and conservation. Leveraging recent progress in image processing and analysis, these globally available black-and-white images can offer better insights into the historical changes of ecosystems, species populations or changes in human influences on the environment dating back to the 1960s, the researchers suggest.

Historical satellite images cover nearly the entire globe across all seasons

In their study, the researchers initially evaluated the spatial, temporal, and seasonal coverage of over one million declassified images from four historical US spy-satellite programmes, showing that this data spans nearly the entire globe and is available across all seasons. Upon reviewing how spy-satellite imagery is currently employed in ecology-related fields, the team then identified potential future applications. Crucially, the broad spatial-temporal scale of the satellite images could enhance the understanding of ecological concepts such as shifting baselines, lag effects, and legacy effects. This improved understanding could lead to better mapping of the historical extent and structure of ecosystems, aid in the reconstruction of past habitats and species distributions as well as offer new insights into historical human impacts on present ecosystem conditions. Going forward, this knowledge can also be helpful for conservation planning and ecosystem restoration efforts by helping identify, for example, meaningful ecological baselines, the…

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