Transcripts of 13712_Landsat_Legacy_ep3_fb

(on-screen text) Landsat 9: Continuing the Legacy

Mike O'Brien: It was a Friday night even, and it was about 10:00 PM. And I got a phone call cause I’m on call. Basically, had the operator explain that the antenna stopped moving during setup.

Narrator: This is Mike O’Brien recounting a call that every ground station engineer dreads: The antenna is down and you have less than two hours to fix it before the satellite needs to make contact with it.

Mike O'Brien: Um, I drove to site. It was exactly what I thought it was at the time. It was a software problem and the antenna drove itself into a limit. When it does that, it kills power to the antenna and it has to be manually manipulated to move out of that area. So I, you know, put the harness on, you know, got into the lift, went up to the axis. Um, you have to open that, uh, housing doors, which is no big deal. And then you crank the hand crank, which physically moves the antenna and it moved in out of that limit area. I had about 12 minutes left before the next pass started.

(on-screen text) Episode 3: More Than Just a Pretty Picture

Narrator: Let’s take a step back to explain why, apart from strapping yourself to a lift 30 feet in the air, this is a stressful situation. A Landsat satellite orbits the earth every 99 minutes, furiously collecting images of everything below it with each pass. Much like the storage on your phone quickly decreases as your pictures of cute dogs increase, Landsat’s storage is also limited. Which is why the satellite makes contact with a ground station every few hours to offload its data. But what if the ground station is down? Well, in that case, Landsat’s internal harddrive fills up and doesn’t capture the next round of images. Critical data is lost. Luckily, that is extremely rare and data is hardly ever lost... especially with a workflow like this: Mike O’Brien: So every time a Landsat 8 image comes in, I record on four independent different pieces of equipment. That way, if there's a failure, I still have three other great copies.

Narrator: We couldn’t really tell the story of data without mentioning Landsat’s data renaissance when a landmark decision changed earth science forever.  In 1990, Landsat data cost as much as $4,000 per "scene". Usually scientists require several of these "scenes" to do their research. As you can imagine, the cost was a major obstacle. In 2008, Landsat took down its paywall. 

Kristi Kline: I recall having one of our international cooperator meetings and a woman from Russia was there and she gave a briefing that really highlighted the importance of free data basically saying how it was democratizing for countries like hers, where suddenly you had an open source of information where, anybody could get access and see what was going on on the face of the earth. 

Narrator: Kristi Kline manages the entire Landsat data archive, nearly 50 years of it. She knows first hand how hungry the science community is for Landsat products. The first year scenes were available for free, downloads jumped exponentially. 

Kristi Kline: In 2008, we had over a million downloads. And today, we typically get 15 to 20 million each year.

Narrator: Which brings us to our next segment… Look at these. Stunning, right? WRONG I mean, well yes, they are gorgeous, but they are also a consistent record of change over time.  At its most basic level, it’s easy to see how Earth has changed since Landsat 1 launched in 1972. Just look at an early image and then compare it to a current one. Maybe it’s changed a lot, maybe a little, but that’s about all you can say. Landsat provides more than just pictures, though From space, it sends back verified scientific data in multiple wavelengths. With Landsat, we can quantify exactly how much each 30-meter by 30-meter pixel has changed. And with the full Landsat archive available at no cost, you can track the complete progression of each pixel throughout the season. And you can do that for millions of pixels at a time. Has a piece of land changed from wetlands to suburban housing? Did forests become farmland? Or, looking closer, have *these* pixels of forest become stressed due to insect damage? Are *those* pixels of farm fields suffering from drought? With carefully calibrated Landsat data, it is possible to answer these questions for the whole globe.

Jeff Masek: It’s you know, it's a slice of human history. It's amazing how well for this 50 years we're documenting every change on the planet. 

Narrator: This is Jeff Masek, Landsat 9 Project Scientist.

Jeff Masek: My thing has always been history. My academic training is actually in geology, but the thing that I sort of loved about geology was still that kind of long time, right. It's just being able to, like, stand in a spot and say that, you know, there was an ocean here 50 million years ago, and I can look at the fossils that are indicated for that.  The thing that got me into the Landsat record was still that historical perspective It's not 50 million years, it's 50 years, but still you're seeing before your eyes, how the environment of forest change, how agriculture changes, urban expansion, the whole, the whole thing, how the planet has changed over 50 years. Not only can you not conserve what you cannot measure, you can't measure the effectiveness of conservation approaches if you can't measure the change.  We have limited resources, we have environmental pressures, we can do something about them if we have the right information.

(on-screen text) Coming Next... (off-screen voice) Quatre, trois, deux,

Jeff Masek: You know, there’s almost been an explosion in the number of Earth resources satellites, Earth observation satellites that are out there in the international community

(on-screen text) Episode Four: Plays Well with Others

Landsat is a joint program of NASA and USGS