Earth Matters

May Puzzler

May 30th, 2023 by Kathryn Hansen

Update on June 13, 2023: This puzzler image shows France’s Chausey Islands (Îles Chausey), around low tide on July 22, 2018. The islands are subject to some of the largest tidal ranges on Earth. Congratulations to Michelangelo Grillo, who was the first to identify the correct location. Grillo was also the first to mention the region’s extreme tides. View the same area during high tide in our Image of the Day story.

Every month on Earth Matters, we offer a puzzling satellite image. The May 2023 puzzler is shown above. Your challenge is to use the comments section to tell us where it is, what we are looking at, and why it is interesting. 

How to answer. You can use a few words or several paragraphs. You might simply tell us the location, or you can dig deeper and offer details about what satellite and instrument produced the image, what spectral bands were used to create it, or what is compelling about some obscure feature. If you think something is interesting or noteworthy, tell us about it.

The prize. We cannot offer prize money or a trip on the International Space Station, but we can promise you credit and glory. Well, maybe just credit. Within a week after a puzzler image appears on this blog, we will post an annotated and captioned version as our Image of the Day. After we post the answer, we will acknowledge the first person to correctly identify the image at the bottom of this blog post. We also may recognize readers who offer the most interesting tidbits of information. Please include your preferred name or alias with your comment. If you work for or attend an institution that you would like to recognize, please mention that as well.

Recent winners. If you have won the puzzler in the past few months, or if you work in geospatial imaging, please hold your answer for at least a day to give less experienced readers a chance.

Releasing Comments. Savvy readers have solved some puzzlers after a few minutes. To give more people a chance, we may wait 24 to 48 hours before posting comments. Good luck!

April Puzzler

April 18th, 2023 by Lindsey Doermann
april puzzler image

Update on May 2, 2023: This puzzler image is a false-color view of seasonal flooding of Australia’s Diamantina River in April 2023. Congratulations to Steve Hawkins for being the first reader to correctly identify the image and to David Smith for finding its exact location. Read more about the location in our Image of the Day story.

Every month on Earth Matters, we offer a puzzling satellite image. The April 2023 puzzler is shown above. Your challenge is to use the comments section to tell us where it is, what we are looking at, and why it is interesting. 

How to answer. You can use a few words or several paragraphs. You might simply tell us the location, or you can dig deeper and offer details about what satellite and instrument produced the image, what spectral bands were used to create it, or what is compelling about some obscure feature. If you think something is interesting or noteworthy, tell us about it.

The prize. We cannot offer prize money or a trip on the International Space Station, but we can promise you credit and glory. Well, maybe just credit. Within a week after a puzzler image appears on this blog, we will post an annotated and captioned version as our Image of the Day. After we post the answer, we will acknowledge the first person to correctly identify the image at the bottom of this blog post. We also may recognize readers who offer the most interesting tidbits of information. Please include your preferred name or alias with your comment. If you work for or attend an institution that you would like to recognize, please mention that as well.

Recent winners. If you have won the puzzler in the past few months, or if you work in geospatial imaging, please hold your answer for at least a day to give less experienced readers a chance.

Releasing Comments. Savvy readers have solved some puzzlers after a few minutes. To give more people a chance, we may wait 24 to 48 hours before posting comments. Good luck!

March Puzzler

March 28th, 2023 by Kathryn Hansen


Update on April 17, 2023: This puzzler image shows Crater Lake in south-central Oregon in March 2023. The lake is especially scenic in early spring when its deep-blue waters contrast with a blanket of snow on land. Congratulations to Dan Taylor for being the first reader to correctly identify the image. Read more about the location in our Image of the Day story.

Every month on Earth Matters, we offer a puzzling satellite image. The March 2023 puzzler is shown above. Your challenge is to use the comments section to tell us where it is, what we are looking at, and why it is interesting. 

How to answer. You can use a few words or several paragraphs. You might simply tell us the location, or you can dig deeper and offer details about what satellite and instrument produced the image, what spectral bands were used to create it, or what is compelling about some obscure feature. If you think something is interesting or noteworthy, tell us about it.

The prize. We cannot offer prize money or a trip on the International Space Station, but we can promise you credit and glory. Well, maybe just credit. Within a week after a puzzler image appears on this blog, we will post an annotated and captioned version as our Image of the Day. After we post the answer, we will acknowledge the first person to correctly identify the image at the bottom of this blog post. We also may recognize readers who offer the most interesting tidbits of information. Please include your preferred name or alias with your comment. If you work for or attend an institution that you would like to recognize, please mention that as well.

Recent winners. If you have won the puzzler in the past few months, or if you work in geospatial imaging, please hold your answer for at least a day to give less experienced readers a chance.

Releasing Comments. Savvy readers have solved some puzzlers after a few minutes. To give more people a chance, we may wait 24 to 48 hours before posting comments. Good luck!

September Puzzler

September 26th, 2022 by Kathryn Hansen

Update on October 26, 2022: This puzzler image shows Lake Retba along the coast of Senegal. The lake’s water’s are often rosy, but had darkened by the time this image was acquired in September 2022 after bouts of heavy rainfall and flooding. Congratulations to Keith Trinity, who was the first to correctly identify the lake and its location. Special mention goes to Rakhee Ranjan for pointing out the intense monsoon season in 2022 and other facts about the region. Read more in the related Image of the Day.

Every month on Earth Matters, we offer a puzzling satellite image. The September 2022 puzzler is shown above. Your challenge is to use the comments section to tell us where it is, what we are looking at, and why it is interesting.

How to answer. You can use a few words or several paragraphs. You might simply tell us the location, or you can dig deeper and offer details about what satellite and instrument produced the image, what spectral bands were used to create it, or what is compelling about some obscure feature. If you think something is interesting or noteworthy, tell us about it.

The prize. We cannot offer prize money or a trip on the International Space Station, but we can promise you credit and glory. Well, maybe just credit. Within a week after a puzzler image appears on this blog, we will post an annotated and captioned version as our Image of the Day. After we post the answer, we will acknowledge the first person to correctly identify the image at the bottom of this blog post. We also may recognize readers who offer the most interesting tidbits of information. Please include your preferred name or alias with your comment. If you work for or attend an institution that you would like to recognize, please mention that as well.

Recent winners. If you have won the puzzler in the past few months, or if you work in geospatial imaging, please hold your answer for at least a day to give less experienced readers a chance.

Releasing Comments. Savvy readers have solved some puzzlers after a few minutes. To give more people a chance, we may wait 24 to 48 hours before posting comments. Good luck!

August Puzzler

August 2nd, 2022 by Kathryn Hansen


Update on August 5, 2022: This puzzler image shows a portion of Nordaustlandet—a large island in northeast Svalbard. The image was acquired after a record amount of melting took place across the Norwegian archipelago in summer 2022. Notice the extensive light-blue areas where snow and firn have melted away and exposed bare ice (light blue). Congratulations to Yoshihiro Nakayama, who correctly identified the location. Special mention goes to Soren J and others for pointing features associated with melting. Read more in the related Image of the Day.

Every month on Earth Matters, we offer a puzzling satellite image. The August 2022 puzzler is shown above. Your challenge is to use the comments section to tell us where it is, what we are looking at, and why it is interesting.

How to answer. You can use a few words or several paragraphs. You might simply tell us the location, or you can dig deeper and offer details about what satellite and instrument produced the image, what spectral bands were used to create it, or what is compelling about some obscure feature. If you think something is interesting or noteworthy, tell us about it.

The prize. We cannot offer prize money or a trip on the International Space Station, but we can promise you credit and glory. Well, maybe just credit. Within a week after a puzzler image appears on this blog, we will post an annotated and captioned version as our Image of the Day. After we post the answer, we will acknowledge the first person to correctly identify the image at the bottom of this blog post. We also may recognize readers who offer the most interesting tidbits of information. Please include your preferred name or alias with your comment. If you work for or attend an institution that you would like to recognize, please mention that as well.

Recent winners. If you have won the puzzler in the past few months, or if you work in geospatial imaging, please hold your answer for at least a day to give less experienced readers a chance.

Releasing Comments. Savvy readers have solved some puzzlers after a few minutes. To give more people a chance, we may wait 24 to 48 hours before posting comments. Good luck!

Skygazing for Science

July 1st, 2022 by Sara Pratt

Participants taking cloud observations. Image credit: The GLOBE Program

Clouds are an important part of the climate system. They affect how much sunlight reaches the ground and how much heat returns to space, which in turn affects Earth’s temperature and rainfall patterns. Scientists are working to better understand the role that clouds play in the global climate system, but that requires significant amounts of data.

“No single cloud observation method or system … is able to provide a complete and accurate depiction of cloud properties across the Earth under the many conditions that naturally occur,” said Bill Smith, an atmospheric scientist at NASA’s Langley Research Center (LaRC). Cloud observations are gathered by active and passive satellites, ground-based sensors, and, by humans.

The citizen scientists of the GLOBE Program have been playing a vital role in data collection by observing clouds around the globe, especially at times that “match” a satellite flyover. When that happens, the observations from the citizen scientists on the ground are matched with satellite observations that were made near the same time and place. By combining the ground-up view of GLOBE citizen scientists with the top-down view of satellites, scientists get a more complete view of the atmosphere.

Now, the NASA GLOBE Clouds team is hoping to hit a significant milestone: one million matches by the time of the GLOBE annual meeting in late July 2022.


Image credit: The GLOBE Program

When a GLOBE cloud observation is taken within 15 minutes of a satellite observation, both points of view are coupled, creating a match. Some satellites are geostationary satellites, such as GOES, Himawari, and Meteosat. Others are polar-orbiting satellites, such as Aqua, Terra, and CALIPSO. The satellite-matched data provides an augmented dataset for research. When a match is made, the NASA GLOBE Clouds team sends a personalized email to participants with the matching satellite data. Approximately 4,000 emails are sent to participants each month.


Classifying clouds using the GLOBE Observer application. Image credit: The GLOBE Program

Participants who want to help GLOBE meet their million-match goal this July can photograph clouds, then upload the photographs and classify the clouds using the GLOBE Observer app. Visit the GLOBE Observer website to learn more about the Match to a Million campaign and how you can help NASA learn more about Earth’s atmosphere.

Read more about the value of combining ground and space measurements in the GLOBE blog Counting to a Million Matches and learn more about matching to satellites on the GLOBE Clouds Science page. You can also follow GLOBE on social media and share what you’re doing to help GLOBE match to a million by using the hashtag #GLOBE1M .

The NASA-funded Global Learning and Observations to Benefit the Environment (GLOBE) program was launched on Earth Day in 1995. Over the past 27 years, millions of students in more than 120 countries have collected and entered more than 200 million environmental measurements into the GLOBE database. Those observations include surface temperatures, rainfall amounts, tree heights, land cover, mosquito habitats, and a variety of other environmental observations, including cloud type and coverage.

June Puzzler

June 21st, 2022 by Adam Voiland

Update on June 28, 2022: Drumroll please…..?????? ….the answer is….PARAMARIBO, SURINAME. The natural-color image was acquired in June 2022 by the satellite’s Operational Land Imager on Landsat 8. Read more about Paramaribo in our June 27 Image of the Day. Congratulations to Firdous Khodabaks, Corey TM, and Nerdonna for being among the first readers to correctly identify the location. Thanks also for sharing interesting details about oil refining, recent flooding, and the presidential palace.

Every month on Earth Matters, we offer a puzzling satellite image. The June 2022 puzzler is shown above. Your challenge is to use the comments section to tell us where it is, what we are looking at, and why it is interesting.

How to answer. You can use a few words or several paragraphs. You might simply tell us the location, or you can dig deeper and offer details about what satellite and instrument produced the image, what spectral bands were used to create it, or what is compelling about some obscure feature. If you think something is interesting or noteworthy, tell us about it.

The prize. We cannot offer prize money or a trip on the International Space Station, but we can promise you credit and glory. Well, maybe just credit. Within a week after a puzzler image appears on this blog, we will post an annotated and captioned version as our Image of the Day. After we post the answer, we will acknowledge the first person to correctly identify the image at the bottom of this blog post. We also may recognize readers who offer the most interesting tidbits of information. Please include your preferred name or alias with your comment. If you work for or attend an institution that you would like to recognize, please mention that as well.

Recent winners. If you have won the puzzler in the past few months, or if you work in geospatial imaging, please hold your answer for at least a day to give less experienced readers a chance.

Releasing Comments. Savvy readers have solved some puzzlers after a few minutes. To give more people a chance, we may wait 24 to 48 hours before posting comments. Good luck!

March Puzzler

March 15th, 2022 by Kathryn Hansen


Update on March 22, 2022: This puzzler image shows Iceberg D-30A drifting amid sea ice in Antarctica’s Weddell Sea. The false-color image was created by blending data from the Landsat 8 satellite’s satellite’s Operational Land Imager (for detail and texture) and its Thermal Infrared Sensor (TIRS). The warmest areas (yellow, orange, and red) depict open water and thin, newly formed sea ice. The coldest areas (blue and white) are older, thicker ice, including the icebergs and broken ice rubble in their paths. Congratulations to Jan Lieser who correctly identified the iceberg and various sea ice types. Honorable mention goes to Sergio Vidal-Luengo and Veronica Zapata for correctly identifying the thermal component of the image. Read more in the related Image of the Day.

Every month on Earth Matters, we offer a puzzling satellite image. The March 2022 puzzler is shown above. Your challenge is to use the comments section to tell us where it is, what we are looking at, and why it is interesting.

How to answer. You can use a few words or several paragraphs. You might simply tell us the location, or you can dig deeper and offer details about what satellite and instrument produced the image, what spectral bands were used to create it, or what is compelling about some obscure feature. If you think something is interesting or noteworthy, tell us about it.

The prize. We cannot offer prize money or a trip on the International Space Station, but we can promise you credit and glory. Well, maybe just credit. Within a week after a puzzler image appears on this blog, we will post an annotated and captioned version as our Image of the Day. After we post the answer, we will acknowledge the first person to correctly identify the image at the bottom of this blog post. We also may recognize readers who offer the most interesting tidbits of information. Please include your preferred name or alias with your comment. If you work for or attend an institution that you would like to recognize, please mention that as well.

Recent winners. If you have won the puzzler in the past few months, or if you work in geospatial imaging, please hold your answer for at least a day to give less experienced readers a chance.

Releasing Comments. Savvy readers have solved some puzzlers after a few minutes. To give more people a chance, we may wait 24 to 48 hours before posting comments. Good luck!

EO January 2022 Puzzler

January 25th, 2022 by Mike Carlowicz

Every month on Earth Matters, we offer a puzzling satellite image. The January 2022 puzzler is shown above. Your challenge is to use the comments section to tell us where it is, what we are looking at, and why it is interesting.

How to answer. You can use a few words or several paragraphs. You might simply tell us the location, or you can dig deeper and offer details about what satellite and instrument produced the image, what spectral bands were used to create it, or what is compelling about some obscure feature. If you think something is interesting or noteworthy, tell us about it.

The prize. We cannot offer prize money or a trip on the International Space Station, but we can promise you credit and glory. Well, maybe just credit. Within a week after a puzzler image appears on this blog, we will post an annotated and captioned version as our Image of the Day. After we post the answer, we will acknowledge the first person to correctly identify the image at the bottom of this blog post. We also may recognize readers who offer the most interesting tidbits of information. Please include your preferred name or alias with your comment. If you work for or attend an institution that you would like to recognize, please mention that as well.

Recent winners. If you have won the puzzler in the past few months, or if you work in geospatial imaging, please hold your answer for at least a day to give less experienced readers a chance.

Releasing Comments. Savvy readers have solved some puzzlers after a few minutes. To give more people a chance, we may wait 24 to 48 hours before posting comments. Good luck!

February 1 update: The answer is suspended sediment in the Gulf of Khambhat, off the northwest coast of India. Congratulations to K Suraj, who correctly identified the Gujarat region of India and the Arabian Sea coast. Read more in this Image of the Day.

NASA To Launch Four Earth Science Missions in 2022

December 30th, 2021 by Alison Gold, NASA’s Earth Science News Team

NASA will launch four Earth science missions in 2022 to provide scientists with more information about fundamental climate systems and processes including extreme storms, surface water and oceans, and atmospheric dust. Scientists will discuss the upcoming missions at the American Geophysical Union’s (AGU) 2021 Fall Meeting, hosted in New Orleans between Dec. 13 and 17.

NASA has a unique view of our planet from space. NASA’s fleet of Earth-observing satellites provides high-quality data on Earth’s interconnected environment, from air quality to sea ice. These four missions will enhance the ability to monitor our changing planet:

  • TROPICS will use six small satellites to provide improved and rapid measurements of tropical cyclones.
  • EMIT will trace the origin and composition of mineral dust that can affect climate, ecosystems, air quality, and human health with an imaging spectrometer aboard the International Space Station.
  • NOAA’s JPSS-2 will help scientists predict extreme weather conditions including floods, wildfires, volcanoes and more.
  • SWOT will evaluate the world’s oceans and their role in climate change, as well as monitor lakes, rivers, and other surface waters.

Measuring Tropical CyclonesTime-Resolved Observations of Precipitation structure and storm Intensity with a Constellation of Smallsats (TROPICS)

NASA’s TROPICS mission aims to improve observations of tropical cyclones. Six TROPICS satellites will work in concert to provide microwave observations of a storm’s precipitation, temperature, and humidity as quickly as every 50 minutes. Scientists expect the data will help them understand the factors driving tropical cyclone intensification and will contribute to weather forecasting models.

In June 2021, the first pathfinder, or proof of concept satellite of the constellation started collecting data, including from Hurricane Ida in August 2021. The TROPICS satellites will be deployed in pairs of two over three different launches, expected to be completed by July 31, 2022.

The Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP satellite acquired this nighttime view of Hurricane Ida on August 30, 2021. Image Credit: NASA Earth Observatory

Each satellite is about the size of a loaf of bread and carries a miniaturized microwave radiometer instrument. Traveling in pairs in three different orbits, they will collectively observe Earth’s surface more frequently than current weather satellites making similar measurements, greatly increasing the data available for near real-time weather forecasts.

The TROPICS team is led by Principal Investigator Dr. William Blackwell at MIT’s Lincoln Laboratory in Lexington, Massachusetts, and includes researchers from NASA, the National Oceanic and Atmospheric Administration (NOAA), and several universities and commercial partners. NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida, will manage the launch service.

“The coolest part of this program is its impact on helping society,” Blackwell said. “These storms affect a lot of people. The higher frequency observations provided by TROPICS have the potential to support weather forecasting that may help people get to safety sooner.”

Studying Mineral Dust — Earth Surface Mineral Dust Source Investigation (EMIT)

Winds kick up dust from Earth’s arid regions and transport the mineral particles around the world. The dust can influence the radiative forcing   or the balance between the energy that comes toward Earth from the Sun, and the energy that Earth reflects back out into space  hence the temperature of the planet’s surface and atmosphere. Darker, iron-laden minerals tend to absorb energy, which leads to heating of the environment, while brighter, clay-containing particles scatter light in a way that may lead to cooling. In addition to affecting regional and global warming of the atmosphere, dust can affect air quality and the health of people worldwide, and when deposited in the ocean, can also trigger blooms of microscopic algae.

In June 2020, the “Godzilla” dust storm traveled from the Sahara desert across the Atlantic Ocean, as seen in this true-color satellite imagery from the Visible Infrared Imaging Radiometer Suite (VIIRS) aboard the NASA-NOAA Suomi NPP satellite and the NOAA-20 satellite. Image Credit: NASA / Scientific Visualization Studio

The goal of the Earth Surface Mineral Dust Source Investigation (EMIT) mission is to map where the dust originates and estimate its composition so that scientists can better understand how it affects the planet. Targeted to launch in 2022, EMIT has a prime mission of one year and will be installed on the International Space Station. EMIT will use an instrument called an imaging spectrometer that measures visible and infrared light reflecting from surfaces below. This data can reveal the distinct light-absorbing signatures of the minerals in the dust that helps to determine their composition.

“EMIT will close a gap in our knowledge about arid land regions of our planet and answer key questions about how mineral dust interacts with the Earth system,” said Dr. Robert Green, EMIT principal investigator at NASA’s Jet Propulsion Laboratory.

Observing Earth’s Storms — Joint Polar Satellite System (JPSS)

Forecasting extreme storms many days in advance requires capturing precise measurements of the temperature and moisture in our atmosphere, along with ocean surface temperatures. The NOAA/NASA Joint Polar Satellite System satellites provide this critical data, which is used by forecasters and first responders. The satellites also tell us about floods, wildfires, volcanoes, smog, dust storms, and sea ice.

“JPSS satellites are a vital component of the global backbone of numerical weather prediction,” said JPSS Program Science Adviser Dr. Satya Kalluri. 

An illustration of the Joint Polar Satellite System (JPSS). JPSS is a collaborative program between the National Oceanic and Atmospheric Administration (NOAA) and NASA. JPSS-2 is NOAA’s next-generation operational Earth observation program that acquires and distributes global environmental data primarily from multiple polar-orbiting satellites. Image Credit: Orbital ATK/Northrop Grumman Innovation Systems

The JPSS satellites circle Earth from the North to the South Pole, taking data and images as they fly. As Earth rotates under these satellites, they observe every part of the planet at least twice a day. 

The Suomi-NPP (National Polar orbiting-Partnership) and NOAA-20 satellites are currently in orbit. The JPSS-2 satellite is targeted to launch in 2022 from Vandenberg Space Force Base in California on a United Launch Alliance Atlas V rocket. Three more satellites will launch in the coming years, providing data well into the 2030s. NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida, will manage the launch service.

Surveying Earth’s Surface Water and Oceans – Surface Water and Ocean Topography (SWOT)

The Surface Water and Ocean Topography (SWOT) mission will help researchers determine how much water Earth’s oceans, lakes, and rivers contain. This will aid scientists in understanding the effects of climate change on freshwater bodies and the ocean’s ability to absorb excess heat and greenhouse gases like carbon dioxide.

NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida, will manage the launch service, which is targeted for November 2022. SWOT will launch on a SpaceX Falcon 9 rocket from Vandenberg Space Force Base in California.

SWOT will collect data across a 75-mile (120-kilometer) wide swath, with a gap in the center for an altimetry track. This animation shows the collection of data over the state of Florida, which is rich with rivers, lakes, and wetlands. Globally, measurements will be taken both over the ocean and over freshwater areas. Image Credit: NASA/JPL-Caltech

The SUV-size satellite will measure the height of water using its Ka-band Radar Interferometer, a new instrument that bounces radar pulses off the water’s surface and receives the return signals with two different antennas at the same time. This measurement technique allows scientists to precisely calculate the height of the water. The data will help with tasks like tracking regional shifts in sea level, monitoring changes in river flows and how much water lakes store, as well as determining how much freshwater is available to communities around the world.

“SWOT will address the ocean’s leading role in our changing weather and climate and the consequences on the availability of freshwater on land,” said Dr. Lee-Lueng Fu, SWOT project scientist at NASA’s Jet Propulsion Laboratory.

The mission is a collaboration between NASA and the French space agency Centre National d’Etudes Spatiales, with contributions from the Canadian Space Agency and the United Kingdom Space Agency.