Views of the News
October 29, 2015 - Death Valley 1,000-year Flood Event
This October, a system of storms caused significant flooding in most of Death Valley National Park, California. Flash floods from the storm destroyed roads and utilities, and damaged several historical structures. This image pair contrasts an October 2014 image (a year with typical precipitation) to October 2015. The false color images highlight hydrogeology; the areas in green to blue are the locations with moisture content. Especially striking is the Badwater Basin, normally a dry lakebed. In the 2015 image, it is full of water.
August 14, 2015 - Suez Canal Expansion, Egypt
A massive expansion project added an additional shipping lane in the Suez Canal, and it only took one year to complete. Egypt celebrated the opening of the new Suez Canal in a ceremony on August 6. The expansion includes 21 miles of new channels and will shorten waiting times. The canal’s extra lane is clearly visible in Landsat imagery. Compare the 2014 and 2015 Landsat 8 images to see the location of the new channel near Ismailia, Egypt.
May 18, 2015 - 35th Anniversary of Mount St. Helens Eruption
The violent eruption of Mount St. Helens 35 years ago permanently changed the mountain and surrounding forest. The volcanic blast on May 18, 1980, devastated more than 150 square miles of forest within a few minutes. In the Landsat false-color images above, forest appears as bright red interspersed with patches of logging. Snow appears white, and ash is gray. Use the slider to see the widespread effects of the huge blast.
Mount St. Helens Today
A more recent Landsat image shows gradual vegetation regrowth, as light red and pink, in the devastated area. However, the gray around the mountain is still evident, and the volcanic crater is still prominent.
April 24, 2015 - The Rio Grande in Drought
The Rio Grande River runs from southern Colorado’s San Juan Mountains to the Gulf of Mexico. In recent years the western United States has experienced a drought that continues to persist. Due to low rainfall and less snowmelt in the mountains, the Rio Grande River is showing the effects of this drought. In the Landsat satellite images above you can see a small portion of the river near Hatch, New Mexico. In the 2008 image, the river is the blue line flanked by green farm fields. The 2015 image shows dry patches in the riverbed where water once flowed. The waterway is now facing a fifth consecutive year of drought.
March 4, 2015 - New land forming in the Atchafalaya Bay
While most of the delta plain along the Louisiana coast is losing ground, new land is forming in the Atchafalaya Bay at the mouths of the Wax Lake Outlet and the Atchafalaya River. In the 1950s, geologists first noticed mud deposits building up in Atchafalaya Bay, but after a severe flood in 1973, new land began to rise above the water line. Since then, the two deltas have grown considerably. The Landsat satellite images above illustrate the growth of the deltas between 1984 and 2014.
See the full story at the NASA Earth Observatory.
January 22, 2015 - Super Stadium
The University of Phoenix Stadium in Glendale, Arizona, will be the location of Super Bowl XLIX. As seen in the USGS High-Resolution Orthoimagery above, the stadium’s roof can open and close. Another feature about the stadium is that the natural grass field can be rolled outside to get sunlight, then rolled inside before a game. The Landsat 8 image, on the left, uses near-infrared light to display vegetation as red. The red pixels just southeast of the stadium show that at the time the image was acquired, the field was outside enjoying the sun.
January 12, 2015 - Sampson Flat Fire, Australia
The Sampson Flat Fire started on January 2, 2015, near Adelaide, Australia. Changing wind conditions caused the fire to spread quickly and move erratically. By January 7, it had burned over 120 square kilometers (46 square miles). In the Landsat 8 image acquired on January 4, the burned areas are dark brown. Active fire appears red with white-blue smoke rising from it.
November 25, 2014 - Holuhraun Lava Flow, Iceland
A volcanic eruption that started on August 31 in Iceland shows no sign of weakening. The eruption is happening in the Holuhraun lava field, an eruptive fissure of the Bardarbunga volcano. The Landsat 8 false-color image combines shortwave infrared, near-infrared, and green wavelengths of light. In this image, the lava glows bright orange and red, and snow and ice are shades of blue-green. The natural color image is based on the visible wavelengths of light. The thermal infrared image shows relative surface temperature over the region. The hottest areas (erupted lava) are bright and colder areas (glacial ice and water bodies) are shown in dark tones.
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October 30, 2014 - 20 Million and counting!
Since 2008, all Landsat data—archived and newly acquired—have been available for free download. On September 16, 2014, users worldwide downloaded over 14,000 scenes from the servers at the USGS Earth Resources Observation and Science (EROS) Center. These downloads brought the total number of Landsat data downloads to more than 20 million.
This Landsat 8 scene of Juneau, Alaska, and the Juneau Icefield was one of the many downloaded on September 16. Read the full story here.
September 23, 2014 - Detailed Elevation Data-Niger River Delta
Shuttle Radar Topography Mission (SRTM) data had previously only been available worldwide at 90-meter resolution. The National Geospatial-Intelligence Agency (NGA), NASA, and USGS are now releasing a newly processed, global SRTM 30-meter dataset.
The above images show an example of the difference between the 90-meter and 30-meter data of the Niger River Delta in western Africa. The Landsat image, also at 30-meter resolution, of the same area shows the extensive coastal estuaries, tidal flats, mangrove forests, and lowland rainforests of this part of southern Nigeria. More detailed elevation data are especially critical in such coastal settings that have small elevation changes.
For more information on the new SRTM elevation product, see the USGS Top Story here.