MODIS Witnesses Deforestation in Borneo: Agricultural fires rage

The skies over Indonesian Borneo is filled with the smoke from hundreds of fires set deliberately to clear indigenous forest areas for subsistence farmland and illegal logging. 

A shroud of thick, gray smoke hangs over the area when the Aqua satellite captured this image on Sept. 25, 2014. 

The Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard the Aqua satellite detected dozens of fires (locations outlined in red) across the entire region from Central Borneo to South Borneo and even on East Laut Island. 

Credit: Jeff Schmaltz, MODIS Rapid Response Team.

The skies over Indonesian Borneo are filled with the smoke from hundreds of fires set deliberately to clear indigenous forest areas for subsistence farmland and illegal logging.

A shroud of thick, gray smoke hung over the area when the Aqua satellite captured this image on September 25, 2014.

The Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard the Aqua satellite detected dozens of fires (locations outlined in red) across the entire region from Central Borneo to South Borneo and even on East Laut Island.

Widespread burning in lowland forests on Borneo is an annual, man-made occurrence.

People use fires to manage and create agricultural lands, including large palm tree plantations that supply palm oil for biodiesel fuel; others are set accidentally during illegal exploitation and logging.

Lowland tropical forests are underlain by a swampy layer of peat that can be up to 20 meters (66 feet) thick.

During the rainy season, when the peat is waterlogged, leaves and other organic matter in the soil don't decay; when the peat dries out, it becomes flammable.

Burning peat generates huge amounts of smoke as is evident in this satellite image. These fires contribute significantly to annual greenhouse gas emissions.

In addition, the smoke released by any type of fire (forest, brush, crop, structure, tires, waste or wood burning) is a mixture of particles and chemicals produced by incomplete burning of carbon-containing materials.

All smoke contains carbon monoxide, carbon dioxide and particulate matter (PM or soot).

Smoke can contain many different chemicals, including aldehydes, acid gases, sulphur dioxide, nitrogen oxides, polycyclic aromatic hydrocarbons (PAHs), benzene, toluene, styrene, metals and dioxins.

Human's exposure to adverse air quality and smoke should be limited as it can cause severe respiratory ailments.

NASA's HyspIRI Mission: Seeing the forest and the trees

Temperature information was collected simultaneously by the MASTER instrument. 

Red areas are composed of minerals with high silica, such as urban areas, while darker and cooler areas are composed of water and heavy vegetation. 

Credit: NASA

To Robert Green, light contains more than meets the eye: It contains fingerprints of materials that can be detected by sensors that capture the unique set of reflected wavelengths.

Scientists have used the technique, called imaging spectroscopy, to learn about water on the moon, minerals on Mars and the composition of exoplanets.

Green's favorite place to apply the technique, however, is right here on the chemically rich Earth, which is just what he and colleagues achieved this spring during NASA's Hyperspectral Infrared Imager (HyspIRI) airborne campaign.

"We have ideas about what makes up Earth's ecosystems and how they function," said Green, of NASA's Jet Propulsion Laboratory in Pasadena, Calif., and principal investigator of the campaign's Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) instrument.

"But a comprehensive understanding requires us to directly measure these things and how they change over landscapes and from season to season."

Toward that goal, scientists and engineers ultimately plan to launch the HyspIRI satellite—a mission recommended by the 2007 National Academy of Sciences Decadal Survey—to determine the spectral and thermal characteristics of the world's ecosystems, which are sensitive to changes in vegetation health, as well as detecting and understanding changes in other surface phenomena including volcanoes, wildfires and droughts.

Prior to flying the sensors in space, however, preparatory science investigations are underway using similar sensor technology installed on NASA's ER-2, a high-altitude aircraft based at NASA's Dryden Aircraft Operations Facility in Palmdale, Calif.

The first season of the HyspIRI airborne campaign concludes on April 25 after about a month of flights that spanned the state. Additional sets of California flights are planned for this summer and then this fall.

"We are collecting data over six zones across very diverse regions of California, from the coast to high-elevation terrain, from alpine areas to deserts to coastal ecosystems, and from agricultural to urban landscapes," Green said.

For example, the campaign's first test flight on March 29 collected data along a series of parallel flight lines.

The resulting image covers about six miles in width and almost 100 miles in length. One flight happened to pass over the San Andreas Fault. Inclusion of the fault in the flight plan was incidental, but it was a "spectacular" flight nonetheless, Green said.