2021-12-03 01:35
Environmental journalists may lack resources at times. But they do have at least one — whiz-bang satellites to help them explain how Earth is changing.
And in September, NASA launched another one. Landsat 9, the latest in the almost 50-year-old series, went up September 27. After about three months of shakedown and calibration, it will be regularly downloading data to anyone who asks.
And yes, ordinary journalists can get stories from it, though it might be an idea to work with tech-savvy collaborators.
Two earlier models, Landsat 7 and 8, are still up there and working (although 7 is slated to retire). These look at Earth’s land surface with pretty fine, 15-meter resolution, in at least nine bands of the light spectrum, returning to the same spot every 16 days or so.
The result is millions of images. Most importantly, the 50-year time series allows evidence-based conclusions about how Earth is changing (and being changed), not just globally but locally too. The Landsat 8 press kit and an image gallery give some idea of what is possible.
The Landsat series is focused on land, but there are other Earth-observing satellites. Some look at the weather, the atmosphere, or the ocean. And some commercial and ex-spy satellites have even finer resolution.
That means Landsat can show trends in deforestation (or afforestation or reforestation), forest health, agricultural crops and cover, other vegetation and cover, coastal erosion, wetland loss and restoration, soil and rock, urbanization, suburban sprawl, drought and flooding, and more.
It can also map the growth and retreat of glaciers, ice sheets and shelves, wildfire impacts, coral reefs, and lots of other natural resource features.
The secret sauce for sophisticated imaging is that it is multispectral. Different geographic features can be distinguished by their wavelengths (or signature combinations thereof). The satellites have sensors that collect light from many separate bands or wavelengths — not just visible light but infrared.
Access to Landsat data without charge was not always a given. Until 2008, even researchers had to pay for Landsat images.
The US Geological Survey (USGS), which runs the data part of the program once Landsat instruments are launched and working, made it free at that time. But it is considering going back to pay-for-data. So use it or lose it.
Meanwhile, USGS has made Landsat data easier to both get and to use. There’s a handy webpage that shows you most of the access menu options, organized so that scientific researchers who can handle vast amounts of data can get that, but so ordinary people who may just want to look at a specific area in specific ways can easily narrow it down.
One handy way to start exploring what is available is a viewing tool called LandsatLook 2.0. It allows you to zoom in on a specific area or time, not to mention choosing your spectrum and layering other geographic features onto the Landsat map.
Unless you are a data journalism specialist, you might do well to seek sources, experts, and collaborators to guide you through the data. Look for gurus in the geography, forestry, and natural resources departments of your local universities. Or find project leaders at relevant government agencies who do research in your area of interest.
Today, many larger news media enterprises have data journalism specialists or teams who may collaborate. Check in with the Investigative Reporters and Editors’ team at the National Institute for Computer-Assisted Reporting, or NICAR.
Satellite imagery (not from Landsat though) helped reporter Ana Ionova with a 2020 series on loss of the Amazon rainforest in Mongabay that won recognition from the Society of Environmental Journalists.
More recently, NPR’s California Newsroom and Stanford University’s Environmental Change and Human Outcomes Lab used satellite data to examine the toxic effects of wildfire smoke.
And just this September, the Allen Coral Atlas announced the completion of its satellite-based atlas of coral bleaching.
You can find a lot more examples of how satellite imaging can be used in journalism projects in this paper.
You might also take a look at what SkyTruth is doing. It’s a nonprofit watchdog that uses satellite data to examine environmental issues. An example is its study of mountaintop removal mining in the Appalachia region of the United States. Find further suggestions (and more here) on developing satellite journalism stories.
