A New Look at the Earth: Landsat 8 Launches

Yesterday, NASA launched the Landsat Data Continuity Mission (LDCM) carry a new Landsat 8 satellite. According to NASA:

LDCM is a collaboration between NASA and the U.S. Geological Survey (USGS). The Landsat program has been providing uninterrupted imagery of Earth since the first Landsat in 1972. About three months after liftoff, USGS will take control and the spacecraft will be renamed Landsat 8. Once on station 438 miles above Earth, LDCM will orbit every 99 minutes and image the entire Earth every 16 days.

There’s not much technology that could claim to have contributed to observing the Earth than the Landsat satellites. Since 1972, The Landsat program has provided imagery used to study the Earth, including changes over the last 40 years. The program was almost not started, then had a history of funding trouble, with a stint at being privately run from 1983-1992.

As a graduate student, I studied Landsat 4 imagery to ascertain its cartographic value. While the spatial resolution improved over the previous Landsat imagery, from 75m to 30m, there were still challenges using the data for any robust accurate mapping. According to the USGS, Landsat 5 delivered high-quality, global data of Earth’s land surface for 28 years and 10 months.

This infographic is a good summary of the history and technical information.

A USGS study showed recent Landsat imagery top five uses as forestry, fire, land use, agriculture, and education. The uses of Landsat data continue to be important to society, as detailed in many articles on this NASA Landsat page.


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