SAN FRANCISCO — Mapping technology giant ESRI has created a new Web-based tool to provide access to 30 years of global Landsat satellite imagery and enable users to identify changes in specific regions over time. Users can see a vivid depiction, for example, of Alaskan glaciers melting, the forests of South America being converted to farmland and the explosive growth of urban areas from Dubai, United Arab Emirates, to Las Vegas.

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Debra Werner is a correspondent for SpaceNews based in San Francisco. Debra earned a bachelor’s degree in communications from the University of California, Berkeley, and a master’s degree in Journalism from Northwestern University. She is a recipient...