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August 7, 2014 - Lake Erie Algae Bloom

Lake Erie Algae Bloom Before
Landsat 8
June 14, 2014
Lake Erie Algae Bloom After
Landsat 8
August 1, 2014
Lake Erie Algae Bloom Map
Lake Erie Algae Bloom Before
Lake Erie Algae Bloom After
June 14, 2014 August 1, 2014
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Algae blooms commonly happen in late summer on Lake Erie, but the blooms have been increasing in recent years. This year, north winds pushed the algae toward the water intake system for Toledo, Ohio, the urban area visible in the lower left of these Landsat 8 images. No algae are visible in the June 14 image, but the algae show up as green swirls on the surface of the water in the August 1 image. The white spots above the land and water are clouds. Read more about the algae bloom at NASA Earth Observatory.

July 22, 2014 - Wildfires in Oregon

Oregon Fires Before
Landsat 8
July 1, 2014
Oregon Fires After
Landsat 8
July 17, 2014
Oregon Location
Oregon Fires Before
Oregon Fires After
July 1, 2014 July 17, 2014
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Dry conditions have made 2014 another busy year for wildfires in the western United States. Lightning started separate fires near Malheur Lake in east-central Oregon on July 14, 2014. These Landsat images were acquired on July 1, 2014, before the fires began and again on July 17, 2014, three days after the fires started. Bright orange shows where the fires were burning at the time of the July 17 image. 

July 10, 2014 - World Cup: Rio de Janeiro

World Cup Location
Landsat 7
June 26, 2014
World Cup Location Map
World Cup Location
June 26, 2014
 

The 2014 Fédération Internationale de Football Association (FIFA) World Cup championship match is Sunday, July 13, at the Maracanã Stadium in Rio de Janeiro. In this Landsat 7 image, acquired on June 26, 2014, the green forested mountains contrast the gray urban area of Rio de Janeiro. Rio’s popular beaches that line the coast are visible as tan strips. The stadium where the action takes place on Sunday is visible as a white circle.­

June 27, 2014 - Flooding in Southeastern South Dakota

Southeastern South Dakota before flooding
Landsat 8
May 28, 2014
Southeastern South Dakota after flooding
Landsat 7
June 21, 2014
Southeastern South Dakota
Southeastern South Dakota before flooding
Southeastern South Dakota after flooding
May 28, 2014 June 21, 2014
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During June 2014, more than 13 inches of rain fell over southeastern South Dakota, southwestern Minnesota and northeast Iowa.  The excessive rains caused rivers and streams to overflow; flooded fields; made roadways impassible; and damaged homes and businesses.
 
These images, collected by Landsat 7 and Landsat 8, show the area of southeastern South Dakota on May 28, 2014, and again on June 21, 2014. Both the Vermillion River (smaller river near center), and the Big Sioux River (on the right) flooded their banks.

June 20, 2014 - Fire at Iraq Oil Refinery

Fire at Iraq Oil Refinery
Landsat 8
June 18, 2014
Baiji, Iraq
Fire at Iraq Oil Refinery
June 18, 2014
 

A Landsat 8 image from June 18 shows a plume of smoke billowing from a large oil refinery in Baiji, Iraq. Located about 130 miles north of Baghdad, the Baiji plant is Iraq’s largest oil refinery, providing much of the region’s fuel for electricity and transportation. An attack on the refinery started late on June 17 by the allies of the extremist group Islamic State of Iraq and Syria (ISIS).

May 23, 2014 - Fires in California, USA

Fires Before
Landsat 8
May 9, 2014
Fires After
Landsat 7
May 17, 2014
Fires Location Map
Fires Before
Fires After
May 9, 2014 May 17, 2014
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A series of wildfires erupted along the coastal region north of San Diego, California, in mid-May 2014. The first wildfire (Bernardo Fire) began on May 13, followed by several additional fires that occurred over the following days. The May 9, 2014, Landsat 8 image shows the area before the fires began. In the Landsat 7 image acquired eight days later on May 17, 2014, the numerous burn areas appear as red tones.

For more information about these fires, go to the EROS Image Gallery at http://eros.usgs.gov/imagegallery/image-week-2.

April 2, 2014 - Urban expansion in Cairo, Egypt

Urban Grown in Cairo Egypt
Landsat 5
April 6, 1987
Urban Grown in Cairo Egypt after image
Landsat 8
March 15, 2014
Urban Grown in Cairo Egypt location map
Urban Grown in Cairo Egypt
Urban Grown in Cairo Egypt after image
April 6, 1987 March 15, 2014
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Cairo, the capital city of Egypt, located in northeastern Africa, has expanded dramatically in the past 28 years. In the Landsat images above, the contrast between the lush vegetation of irrigated fields (bright green) and the desert (tan) is very clear. Cairo, shown as the large gray expanse, increased in population from an estimated 6 million in 1986 to over 15 million in 2014. Urbanization into the neighboring desert is also noticeable by the increased size of the smaller urban areas surrounding the city.

March 28, 2014 - Massive landslide near Oso, Washington

Before Landslide
Landsat 8
January 18, 2014
After Landslide
Landsat 8
March 23, 2014
Before Landslide
After Landslide
January 18, 2014 March 23, 2014
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A major landslide occurred near Oso, Washington, on March 22, 2014, when a portion of a hillside collapsed, sending mud and debris across the North Fork of the Stillaguamish River. The 1-square-mile (2.6-km2) slide damaged property and formed an earthen dam, blocking the river and causing a barrier lake to form. Landsat 8 acquired the January 18, 2014 and March 23, 2014 images above. The March 23rd image clearly shows the aftermath of the landslide.

March 3, 2014 - Landsat 8 scans the moon

Landsat 8 Moon
Landsat 8
June 24, 2013
Landsat 8 Moon
June 24, 2013
 

Landsat 8 was built to do something none of its predecessors had done before: look at the Moon. The Moon provides a stable data source because it is a target with practically static surface cover and no atmospheric effects. Data from on-orbit lunar imaging can be used to track the stability of the Operational Land Imager (OLI) instrument and the Thermal Infrared Sensor (TIRS) aboard Landsat 8, resulting in improved calibration of the data, making good data even better. 

Landsat 8 typically collects lunar data monthly near full Moon - at the lunar phase angle of about 8 degrees. Any changes to the sensor’s radiometry (measurements of light) can be detected and used to improve sensor calibration. Lunar data are collected only for calibration or other engineering purposes, so it is not normally released to the public, but USGS and NASA have decided to put out a sample dataset for those eager to look more closely at Landsat 8 lunar data.

This image is from Landsat 8’s lunar acquisition on June 24, 2013.

 

February 14, 2014 - New Solar farm is viewable from space

before solar farm
Landsat 5
February 2011
Solar farm after
Landsat 8
February 2014
solar farm map
before solar farm
Solar farm after
February 2011 February 2014
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On February 11, Landsat 8 captured the Ivanpah Solar Electric Generating System, southwest of Las Vegas, near Primm, Nevada. Officially opening this week, the giant solar-power farm spans over five square miles of federal land and includes three towers, each the height of a 40-story building, and more than 350,000 heliostat mirrors that are the size of a garage door. The mirrors reflect sunlight onto boilers located on the towers, creating steam that drives power generators. The first of its kind, it is estimated that the farm will be able to light up about 140,000 homes a year. Also noticeable in the upper right on the 2014 image is the Silver State Solar Project.

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