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March 16, 2012 - Monitoring the Everglades

Everglades Before
Landsat Mosaic
1986/1987
Everglades After
Landsat Mosaic
2010/2011
Everglades Before
Everglades After
1986/1987 2010/2011
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Landsat satellite data are proving important to resource managers monitoring one of the Nation's most fragile ecosystems. The largest tract of wilderness east of the Rocky Mountains is located in south Florida within the Everglades National Park. Urban development, increased recreation demands, storms, and hurricanes have all challenged its ecosystem. Comparing the Landsat mosaic data from 1986/1987 and 2010/2011 above shows the gradual change in the fragile system of the Everglades. For more information, visit the Image of the Week section of the EROS Image Gallery.

February 24, 2012 - February Flooding Affecting Australia

Australia Flooding Before
Terra MODIS
February 6, 2012
Australia Flooding After
Terra MODIS
February 18, 2012
Australia Flooding Before
Australia Flooding After
February 6, 2012 February 18, 2012
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By mid-February, flood waters that affected the Australian states of Queensland and New South Wales, had moved west isolating nearly 10,000 residents in northeastern New South Wales. By February 18, flooding was especially apparent between Walgett and Brewarrina, and north of Lightning Ridge and Goodooga, as shown in the image above. The flooding in this area could persist for weeks and is expected to move toward Brewarrina over the next month. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite acquired these images on February 6, 2012, and February 18, 2012.

February 9, 2012 - Pine Island Glacier

Pine Island Glacier Before
Landsat 7
January 25, 2011
Pine Island Glacier After
Landsat 7
January 28, 2012
Pine Island Glacier Before
Pine Island Glacier After
January 25, 2011 January 28, 2012
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In mid-October 2011, NASA scientists discovered a massive crack across the ice shelf of Pine Island Glacier in Antarctica, measuring 19 miles long, 260 feet wide, and 195 feet deep. Eventually, a giant iceberg, covering over 300 square miles, will break off the glacier. Pine Island is one of the largest and fastest-moving glaciers in Antarctica, capturing scientists' attention because of the rate its ice is thinning. Aerial surveys, along with images from multiple satellites, help scientists monitor glaciers over time and better understand their impact on sea level. For more information, visit the Image of the Week section of the EROS Image Gallery.

February 2, 2012 - Lucas Oil Stadium, site of Super Bowl XLVI

Lucas Oil Stadium Before
High-Resolution Orthoimagery
April 2007
Lucas Oil Stadium After
High-Resolution Orthoimagery
March 2011
Lucas Oil Stadium Before
Lucas Oil Stadium After
April 2007 March 2011
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About 70,000 football fans will fill the Lucas Oil Stadium in Indianapolis, IN, Sunday, February 5, for Super Bowl XLVI. Shown in the March 2011 image above, the $720 million stadium opened for the 2008 football season, replacing the RCA Dome as the new home of the Indianapolis Colts. The April 2007 image shows the RCA Dome while the new stadium was being built.

These unique views of the stadium are examples of high-resolution orthoimagery available to the public from the USGS EROS image archive. In orthoimagery, the images have been orthorectified; that is, corrections have been made for feature displacement such as building tilt and for scale variations caused by terrain relief, sensor geometry, and camera tilt. Visit the High Resolution Orthoimagery page for more information.

January 20, 2012 - Urban Growth of Montgomery, Alabama

Montgomery Alabama Before
Landsat 5
September 21, 1986
Montgomery Alabama After
Landsat 5
September 10, 2011
Montgomery Alabama Before
Montgomery Alabama After
September 21, 1986 September 10, 2011
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In the past 30 years the population of Montgomery, AL, has grown from just under 125,000 to over 200,000. The change in land use from forest and croplands to urban and industrial areas is evident in the Landsat images above. City officials use Landsat data to assess the changing land through the years. For more information, visit the Image of the Week section of the EROS Image Gallery.

January 13, 2012 - Postfire Regrowth in the Dominican Republic

Dominican Republic Before
Landsat 7
March 21, 2005
Dominican Republic Middle
Landsat 7
July 27, 2005
Dominican Republic After
Landsat 5
February 10, 2011
Dominican Republic Before
Dominican Republic After
March 21, 2005 February 10, 2011
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In March 2005, large fires burned rainforests in the Cordillera Central in the Dominican Republic. The fires started in José del Carmen Ramirez National Park, on the lower reaches of Pico Duarte, the country's highest mountain. The March 2005 Landsat image above shows the burned mountain slopes as dark brown, unburned forest as green, the hot fire fronts glow red, and the thick smoke appears blue. The dark green covering the fire scars in the February 2011 image indicates the regrowth of the forest lands. For more information, visit the Image of the Week section of the EROS Image Gallery.

January 6, 2012 - Rising Water Changes Caspian Sea Shoreline

Caspian Sea Shoreline Before
Landsat 5
August 21, 1985
Caspian Sea Shoreline After
Landsat 5
August 29, 2011
Caspian Sea Shoreline Before
Caspian Sea Shoreline After
August 21, 1985 August 29, 2011
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While Caspian Sea water levels have historically fluctuated, the area has seen increasing water volume in the past two decades. These Landsat images show a small portion of the Caspian Sea shoreline, in 1985 and again in 2011. The Volga River is the dominant source of water for this inland sea, and heavy rains have greatly enlarged the flow into the Sea in the past decades. For more information, please go to the Image of the Week section of the EROS Image Gallery.

December 28, 2011 - Arcadia Lake, Oklahoma

Arcadia Lake Before
Landsat 5
August 12, 1986
Arcadia Lake After
Landsat 5
August 1, 2011
Arcadia Lake Before
Arcadia Lake After
August 12, 1986 August 1, 2011
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Arcadia Lake, a reservoir located just east of Edmond, Oklahoma, was constructed in the 1980s as part of the National Flood Control Act of 1970. Arcadia Lake was created to control floods in the Deep Fork River Basin, supply water to the city of Edmond, and provide recreational resources to the surrounding communities. Landsat images show the area in 1986, before the earthen dam blocked the Deep Fork River, and in 2011, with the reservoir near capacity. For more information, visit the Image of the Week section of the EROS Image Gallery.

December 24, 2011 - The Dead Sea

Dead Sea Before
Landsat 5
November 9, 1984
Dead Sea After
Landsat 7
November 28, 2011
Dead Sea Before
Dead Sea After
November 9, 1984 November 28, 2011
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The Dead Sea is located in the Jordan Rift Valley and borders Jordan, Israel, and the West Bank. These Landsat images show the change in the Dead Sea from 1984 to 2011. In recent decades, diversion of water from the Jordan River, the sea's main tributary, has caused the Dead Sea to shrink. Mineral evaporation ponds that have replaced open water in the southern part of the sea can be seen in the 2011 image. For more information, visit the Image of the Week section of the EROS Image Gallery.

December 14, 2011 - The alluvial fans of the Mississippi River Delta Basin

Alluvial Fans of the Mississippi River
Landsat 5 Mosaic
October 3 and November 11, 2011
Alluvial Fans of the Mississippi River
October 3 and November 11, 2011
 

The Mississippi River drains over two-thirds of the conterminous United States, sending an enormous amount of water through the Mississippi River Delta Basin in southern Louisiana. The river's velocity slows upon reaching the Gulf, reducing its capacity to carry suspended mud and sand, depositing the sediment in vast alluvial fans as shown in the Landsat 5 mosaic above. The fan deposits are major sources of petroleum, natural gas, and sulfur. This image was created using four Landsat 5 scenes acquired October 3 and November 11.

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