"If you really want to have a long history of understanding any process in the Earth, Landsat is where you should go."

"Without Landsat we would not have the record we have today about deforestation and changing agriculture across a vast and important biome."

"The value of the Landsat archive is that we have a long-term memory of the changes that have occurred across the Amazon frontier."

"Landsat satellite data are the most important source we have about how much deforestation happens each year across the Amazon."

"Landsat is indispensable for Timelapse in Google Earth—and so much more. Thank you @USGSLandsat @NASA_Landsat program, the world’s only long-term, continuous, data record of the entire Earth’s land surfaces dating back to 1972."

"Landsat provides an unparalleled record of how terrestrial Earth has changed since the early 1970s, closely coinciding with the beginning of rapid environmental change. It provides important historical context for the current state of land cover and land use and provides a reference for identifying abnormal types and rates of change."

"I’m grateful that NASA, USGS, and scientists like William Pecora had the foresight to begin collecting Earth observations a half century ago."

"The first step of ecosystem accounting is to actually map the dynamics of ecosystems over time."

"I do sleep, but I dream of Landsat!" 

"Without Landsat, we’d still be in the Dark Ages of tracking global forest carbon using spreadsheet models."

"The Landsat Program continues to be one of the most valuable, respected, and referenced Earth observation programs in the world."

"That is one cool thing about Landsat... people are always finding new applications."