In Pursuit of Precision: Remembering John Barker – NASA Science
By Laura E.P. Rocchio John L. Barker, a seminal force behind Landsat’s science-grade data, died on Monday, July 6, 2026. He was 88. Barker was instrumental in transforming Landsat from a technology demonstration satellite that produced pictures of Earth into a well-understood science mission collecting images made from physically-based spectral measurements of Earth’s surface. The calibration standards relentlessly pursued by Barker […]
In Pursuit of Precision: Remembering John Barker – NASA Science Read More »










