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when you think of a healthy tropical

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forest

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you think of a cacophony of bird sounds

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at dawn and dust

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i i don't know if you know if you've

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been to one of those really deafening

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tropical forests where you can't really

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hear yourself think

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and so i think the you know one thing

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that that's so powerful about acoustic

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data is kind of the visceral

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um

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appreciation for how for change

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when you can actually hear

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the silence

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dr danielle rappaport is a forest

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ecologist who uses nature sounds to

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measure the health of the amazon

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rainforest

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landsat has allowed us to

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map those changing dynamics and get a

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really wonderful objective

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annual time series of how

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humans have been modifying the amazon

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forest

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landsat helped danielle and her team

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target areas of human activity bumping

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up against the amazon forest a region

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known as the frontier

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from there she used bioacoustics to

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assess the effects of human activity on

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wildlife

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landsat was really the

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backbone

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of this study

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danielle is one of thousands of

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scientists that has paired landsat data

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with an entirely different data set to

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uncover a more nuanced understanding of

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the world

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in many cases one set of data can tell

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you what is happening while landsat can

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tell you why it's happening

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[Music]

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the case that we always look at is is

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the middle east where the irrigation has

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led to a depletion of groundwater

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basically what that means is the nasa

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satellite grace picked up some strange

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readings in the middle east that

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indicated their groundwater had suddenly

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decreased by an alarming amount

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landsat later revealed the cause via

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images of the land surface over the past

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several decades saudi arabia had begun

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to employ a method of irrigation that

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was so water intensive it literally

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changed earth's gravitational pull in

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that particular region

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these partnerships between satellites

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sound great after all teamwork makes the

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dream work but how do you make two

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different data sets from two different

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satellites sing here's the secret

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different data sets are complementary

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and not in competition

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see landsat data tells us about local

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conditions on the land surface forests

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neighborhoods farms deserts farms in

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deserts meanwhile grace gives a broad

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regional view of water levels

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underground

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using the two together deepens our

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understanding of the world letting us

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see what causes led to which effects but

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grace is not the only partner for

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landsat the european sentinel one uses

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radar to see through the clouds that

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block landsat's view

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while landsat reveals the colors and

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characteristics of the surface and

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nasa's jedi uses laser pulses to measure

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the height of trees and help map the

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biomass of a forest this nicely

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complements landsat's view of the canopy

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top which assesses the health of the

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trees

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not to mention the long data record that

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lets us track changes over decades

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landsat is also a great complement to

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other similar land imagers in fact our

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friend jeff has done a lot of work to

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harmonize landsat and sentinel-2 data

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back to you jeff central 2 is very much

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like landsat it's a landsat like system

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that the european union

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has fielded since 2015 and so the real

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key there is putting landsat and

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sentinel together

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because uh increasingly what people are

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looking for is a daily observation at

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that kind of resolution

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[Music]

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you know there's been a

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almost an explosion in the number of

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earth resources satellites earth

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observation satellites that are out

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there in the international community

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in addition to signal two

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india

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brazil

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china thailand

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they all have their own earth

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observation programs

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increasingly

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it's about putting all of that

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together and harmonizing the data or at

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least using them

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in time series kinds of ways to really

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what does it mean to be worthy of a

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legacy

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eight generations of landsat satellites

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have quietly observed a changing earth

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from 438 miles above for almost 50 years

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like most things worth doing it hasn't

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been easy i think the landsat program

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today is probably healthier than it's

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been in a very long time we have two

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operational satellites on orbit now

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landsat 9 will join the fleet in 2021

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and then in the late 2020s we'll have

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the landsat next system coming up we

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don't exactly know what that's going to

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look like yet

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but the planning is in place

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and i'm confident that it's going to be

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there

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born during a time of limited technology

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landsat's founders were dreamers who

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laid the foundation for limitless future

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innovation

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as we change so do our forests farms

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cities and suburbs it's a mission that

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spans generations and one that we can

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rely on to tell us what's actually going

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on when the surface of our planet goes

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through transformations

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now we're launching landsat 9 the

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continuation of that dream

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we've enlisted our best and brightest to

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work on this decades-long mission and we

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will for decades to come

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50 more years of earth data in the

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future