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Guinea-Bissau
This Landsat 7 image of Guin …
4/22/09
Description This Landsat 7 image of Guinea-Bissau, a small country in West Africa, shows the complex patterns of the country's shallow coastal waters, where silt...
Date 4/22/09
Guinea-Bissau
This Landsat 7 image of Guin …
4/22/09
Description This Landsat 7 image of Guinea-Bissau, a small country in West Africa, shows the complex patterns of the country's shallow coastal waters, where silt carried by the Geba and other rivers washes out into the Atlantic Ocean. This is a false-color composite image made using infrared, red and blue wavelengths to bring out details in the silt was taken using Landsat 7's Enhanced Thematic Mapper plus (ETM+) sensor on Jan. 12, 2000. Image Credit: NASA/USGS EROS Data Center
Date 4/22/09
Mt. Everest
On May 29, 1953, Edmund Hill …
4/24/09
Description On May 29, 1953, Edmund Hillary, from New Zealand, and Tenzing Norgay, from Nepal, became the first humans to successfully climb to the peak of Mt. Everest, the tallest mountain in the world. They were part of a British expedition lead by Colonel John Hunt sent specifically to reach what was regarded at the time as the 'third pole.' In decades prior, major British expeditions had attempted to be the first to reach the North and South Poles only to come in second place behind the Americans (Robert Peary's expedition to the North Pole) and the Norwegians (Roald Amundsen's expedition to the South Pole). The British made seven attempts to scale Mt. Everest in the previous decades, usually on the North Face from Tibet. But following the Chinese Revolution in 1949, this route to the mountain was closed and so Mt. Everest expeditions had to explore new routes to reach the peak. The 1953 British Expedition climbed up onto the South Col and then along the Southeast Ridge by a route, which is now the most heavily used by the thousands of climbers who have attempted to climb the mountain since. At the time, there were some doubts whether this approach was possible. At 29,035 feet (8,848 m) in altitude, the air is only one-third as thick as the air at sea level. Members of the expedition, as they did in previous attempts, carried bottled oxygen, but this made for a very heavy load on the climbers and could only supplement their oxygen needs, not fully meet them. Since 1953, many successful expeditions have climbed Mt. Everest, including the first American expedition in 1963. However, most climbers fail to make the peak, and many people die each year in the attempt. As of 2003 when this Landsat 7 image was taken, more than 5,000 people have attempted to repeat their feat with only 1,600 successes and 175 fatalities. Image Credit: NASA
Date 4/24/09
Pine Island Glacier, Antarct …
These two images of Pine Isl …
4/3/01
Date 4/3/01
Description These two images of Pine Island Glacier in Antarctica show the recently discovered 25-kilometer (15-mile) long crack that scientists expect will turn into a large iceberg within the next 18 months. The views from NASA's Multi-angle Imaging SpectroRadiometer (MISR) on the Terra satellite also reveal differences in the ice sheet's surface texture, highlighting surface fractures and enabling distinction of rough crevasses from smooth blue ice. The image data shown was acquired on December 12, 2000, during Terra orbit 5246. At left is a conventional, true-color image from the downward-looking (nadir) camera. The false-color image at right is a composite of red-band data taken by the MISR forward 60-degree, nadir, and aftward 60-degree cameras, displayed in red, green and blue, respectively. Color variations in the true-color image at left highlight spectral differences. In the multi-angle composite, on the other hand, color variations act as a proxy for differences in the angular reflectance properties of the scene. In this representation, clouds show up as light purple. Blue to orange gradations on the surface indicate a transition in ice texture from smooth to rough. For example, the bright orange carrot-like features are rough crevasses on the glacier's tongue. In the conventional nadir view, the blue ice labeled "rough crevasses"' and "smooth blue ice" are similarly colored, but the multi-angle composite reveals their different textures, with the smoother ice appearing dark purple instead of orange. This could be an indicator of different mechanisms by which this ice is exposed. The multi-angle view also reveals subtle roughness variations on the frozen sea ice between the glacier and the open water in Pine Island Bay. To the left of the 'icebergs' label are chunks of floating ice. Smaller icebergs embedded in the frozen sea ice are visible below and to the right of the label. These small icebergs are associated with dark streaks. Analysis of the illumination geometry suggests that these streaks are surface features, not shadows. Wind-driven motion and thinning of the sea ice in the vicinity of the icebergs are a possible explanation. Recently, Robert Bindschadler, a glaciologist at the NASA Goddard Space Flight Center discovered in Landsat 7 imagery a newly-formed crack traversing the Pine Island Glacier. This crack is visible as an off-vertical dark line in the MISR nadir view. In the multi-angle composite, the crack and other stress fractures show up very clearly in bright orange. Radar observations of Pine Island Glacier in the 1990's showed the glacier to be shrinking, and the newly discovered crack is expected to eventually lead to the calving of a major iceberg. MISR was built and is managed by NASA's Jet Propulsion Laboratory, Pasadena, Calf., for NASA's Office of Earth Science, Washington, D.C. The Terra satellite is managed by NASA's Goddard Space Flight Center, Greenbelt, Md. JPL is a division of the California Institute of Technology. Image credit: NASA/JPL/GSFC/LaRC, MISR Team #####
Rann of Kachchh, India, pers …
The earthquake that struck w …
4/26/01
Date 4/26/01
Description The earthquake that struck western India on January 26, 2001, was the country's strongest in the past 50 years. This perspective view from NASA's Shuttle Radar Topography Mission (SRTM) shows the area of the earthquake's epicenter in the lower left corner. The southern Rann of Kachchh appears in the foreground. The Rann is an area of low-lying salt flats that shows up with various shades of white and blue in this false- color Landsat image. The gray area in the middle of the image is called the Banni plains. The darker blue spots and curving lines in the Rann and the Banni plains are features that appeared after the January earthquake. Their true colors are shades of white and gray, but the infrared data used in the image gives them a blue or turquoise color. These features are the effects of liquefaction of wet soil, sand and mud layers caused by the shaking of the earthquake. The liquefaction beneath the surface causes water to be squeezed out at the surface, forming mud volcanoes, sand blows and temporary springs. Some of the residents of this dry area were hopeful that they could use the water, but they found that the water was too salty in almost every place where it came to the surface. The city of Bhuj, India, appears as a gray area in the upper right of the image. Bhuj and many other towns and cities nearby were almost completely destroyed by the January 2001 earthquake. This magnitude 7.7 earthquake was the deadliest in the history of India with some 20,000 fatalities and over a million homes damaged or destroyed. The city of Bhuj was the historical capital of the Kachchh region. Highways and rivers appear as dark lines. Vegetation appears bright green in this false-color Landsat image. The city of Anjar is in the dark gray area near the upper left of the image. Previously damaged by a magnitude 6.1 earthquake in 1956 that killed 152 people, Anjar suffered again in the larger 2001 earthquake. The red hills in the center of the image are the Has and Karo Hills, which reach up to 300 meters (900 feet) elevation. Geologists are studying the folded red sandstone layers that form these hills to determine if they are related to the fault that broke in the 2001 earthquake. This three-dimensional perspective view was generated using topographic data from the Shuttle Radar Topography Mission (SRTM) and an enhanced false-color Landsat 7 satellite image. Colors are from Landsat bands 5, 4, and 2 as red, green and blue, respectively. Topographic expression is exaggerated 5X. Landsat has been providing visible and infrared views of the Earth since 1972. SRTM elevation data matches the 30-meter (98-foot) resolution of most Landsat images and will substantially help in analyses of the large and growing Landsat image archive. The Landsat 7 Thematic Mapper image used here was provided to the SRTM by the United States Geological Survey, Earth Resources Observation Systems (EROS) Data Center, Sioux Falls, South Dakota. Elevation data used in this image was acquired by the Shuttle Radar Topography Mission aboard the Space Shuttle Endeavour, launched on February 11, 2000. SRTM used the same radar instrument that comprised the Spaceborne Imaging Radar-C/X- Band Synthetic Aperture Radar (SIR-C/X-SAR) that flew twice on the Space Shuttle Endeavour in 1994. SRTM was designed to collect three-dimensional measurements of the Earth's surface. To collect the 3-D data, engineers added a 60-meter-long (200- foot) mast, installed additional C-band and X-band antennas, and improved tracking and navigation devices. The mission is a cooperative project between the National Aeronautics and Space Administration (NASA), the National Imagery and Mapping Agency (NIMA) of the U.S. Department of Defense (DoD), and the German and Italian space agencies. It is managed by NASA's Jet Propulsion Laboratory, Pasadena, Calif., for NASA's Earth Science Enterprise, Washington, D.C. Image: NASA/JPL/NIMA
3-D Perspective Kamchatka Pe …
Title 3-D Perspective Kamchatka Peninsula Russia
Full Description This perspective view shows the western side of the volcanically active Kamchatka Peninsula in eastern Russia. The image was generated using the first data collected during the Shuttle Radar Topography Mission (SRTM). In the foreground is the Sea of Okhotsk. Inland from the coast, vegetated floodplains and low relief hills rise toward snow capped peaks. The topographic effects on snow and vegetation distribution are very clear in this near-horizontal view. Forming the skyline is the Sredinnyy Khrebet, the volcanic mountain range that makes up the spine of the peninsula. High resolution SRTM topographic data will be used by geologists to study how volcanoes form and to understand the hazards posed by future eruptions. This image was generated using topographic data from SRTM and an enhanced true-color image from the Landsat 7 satellite. This image contains about 2,400 meters (7,880 feet) of total relief. The topographic expression was enhanced by adding artificial shading as calculated from the SRTM elevation model. The Landsat data was provided by the United States Geological Survey's Earth Resources Observations Systems (EROS) Data Center, Sioux Falls, South Dakota. SRTM, launched on February 11, 2000, used the same radar instrument that comprised the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR) that flew twice on the Space Shuttle Endeavour in 1994. To collect the 3-D SRTM data, engineers added a 60- meter-long (200-foot) mast, installed additional C-band and X-band antennas, and improved tracking and navigation devices. SRTM collected three dimensional measurements of nearly 80 percent of the Earth's surface. SRTM is a cooperative project between NASA, the National Imagery and Mapping Agency (NIMA) of the U.S. Department of Defense, and the German and Italian space agencies. Size: 33.3 km (20.6 miles) wide x 136 km (84 miles) coast to skyline. Location: 58.3 deg. North lat., 160 deg. East long. Orientation: Easterly view, 2 degrees down from horizontal. Original Data Resolution: 30 meters (99 feet). Vertical Exaggeration: 3 times.
Date 02/12/2000
NASA Center Jet Propulsion Laboratory
Landsat 7 Looks at Coral Ree …
Title Landsat 7 Looks at Coral Reefs: (1 of 2)
Abstract Coral forms off shore from volcanic islands in tropical latitudes, developing a barrier reef that's separated by a growing lagoon.But over time, while the surrounding ocean wears away the main body of the island, the coral ring remains.
Completed 2000-10-23
Landsat 7 Looks at Coral Ree …
Title Landsat 7 Looks at Coral Reefs: (1 of 2)
Abstract Coral forms off shore from volcanic islands in tropical latitudes, developing a barrier reef that's separated by a growing lagoon.But over time, while the surrounding ocean wears away the main body of the island, the coral ring remains.
Completed 2000-10-23
Landsat 7 Looks at Coral Ree …
Title Landsat 7 Looks at Coral Reefs: (1 of 2)
Abstract Coral forms off shore from volcanic islands in tropical latitudes, developing a barrier reef that's separated by a growing lagoon.But over time, while the surrounding ocean wears away the main body of the island, the coral ring remains.
Completed 2000-10-23
Landsat 7 Looks at Coral Ree …
Title Landsat 7 Looks at Coral Reefs: (1 of 2)
Abstract Coral forms off shore from volcanic islands in tropical latitudes, developing a barrier reef that's separated by a growing lagoon.But over time, while the surrounding ocean wears away the main body of the island, the coral ring remains.
Completed 2000-10-23
A Pop-up of the Arizona Fire …
Title A Pop-up of the Arizona Fires
Abstract RODEO AND CHEDISKI FIRES IN ARIZONA - On June 21, 2002, the Rodeo and Chediski Fires in east-central Arizona were still two separate fires. This true-color scene from the Enhanced Thematic Mapper Plus aboard the Landsat 7 satellite shows the massive quantities of smoke streaming northward from the fires, which are burning about 100 miles east-northeast of Phoenix. The smaller Chediski Fire is on the right, and the Rodeo Fire is on the left. Over the weekend of June 22, the two fires merged into a single 300,000+ acre blaze.
Completed 2002-06-24
A Pop-up of the Arizona Fire …
Title A Pop-up of the Arizona Fires
Abstract RODEO AND CHEDISKI FIRES IN ARIZONA - On June 21, 2002, the Rodeo and Chediski Fires in east-central Arizona were still two separate fires. This true-color scene from the Enhanced Thematic Mapper Plus aboard the Landsat 7 satellite shows the massive quantities of smoke streaming northward from the fires, which are burning about 100 miles east-northeast of Phoenix. The smaller Chediski Fire is on the right, and the Rodeo Fire is on the left. Over the weekend of June 22, the two fires merged into a single 300,000+ acre blaze.
Completed 2002-06-24
Seasonal Change around Salt …
Title Seasonal Change around Salt Lake City: Winter
Abstract Landsat 7 imagery is combined here with terrain elevation data to create a view of the Salt Lake City area, looking towards the West. This image was taken in the winter of 2001 and can be compared to identical animations using images taken at other times of the year.
Completed 2002-01-30
Seasonal Changes: Heber City …
Title Seasonal Changes: Heber City, Utah
Abstract Landsat 7 views Heber City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Seasonal Changes: Heber City …
Title Seasonal Changes: Heber City, Utah
Abstract Landsat 7 views Heber City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Seasonal Changes: Heber City …
Title Seasonal Changes: Heber City, Utah
Abstract Landsat 7 views Heber City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Seasonal Changes: Heber City …
Title Seasonal Changes: Heber City, Utah
Abstract Landsat 7 views Heber City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Seasonal Changes: Heber City …
Title Seasonal Changes: Heber City, Utah
Abstract Landsat 7 views Heber City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Bingham Coppermine, Utah: Gr …
Title Bingham Coppermine, Utah: Growth Over Time!
Abstract Comparing two datasets for Bingham Coppermine, Utah, from the Landsat satellite series. The first dataset is from August 7, 1972, the second, from July 31, 2000.
Completed 2002-01-30
Bingham Coppermine, Utah: Gr …
Title Bingham Coppermine, Utah: Growth Over Time!
Abstract Comparing two datasets for Bingham Coppermine, Utah, from the Landsat satellite series. The first dataset is from August 7, 1972, the second, from July 31, 2000.
Completed 2002-01-30
Seasonal Changes: Salt Lake …
Title Seasonal Changes: Salt Lake City, Utah
Abstract Landsat 7 views Salt Lake City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Seasonal Changes: Salt Lake …
Title Seasonal Changes: Salt Lake City, Utah
Abstract Landsat 7 views Salt Lake City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Seasonal Changes: Salt Lake …
Title Seasonal Changes: Salt Lake City, Utah
Abstract Landsat 7 views Salt Lake City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Seasonal Changes: Salt Lake …
Title Seasonal Changes: Salt Lake City, Utah
Abstract Landsat 7 views Salt Lake City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Seasonal Changes: Salt Lake …
Title Seasonal Changes: Salt Lake City, Utah
Abstract Landsat 7 views Salt Lake City, Utah, as it goes through the seasonal changes.
Completed 2001-10-20
Seasonal Change around Salt …
Title Seasonal Change around Salt Lake City: Fall
Abstract Landsat 7 imagery is combined here with terrain elevation data to create a view of the Salt Lake City area, looking towards the West. This image was taken in the fall of 2001 and can be compared to identical animations using images taken at other times of the year.
Completed 2002-01-30
Seasonal Change around Salt …
Title Seasonal Change around Salt Lake City: Fall
Abstract Landsat 7 imagery is combined here with terrain elevation data to create a view of the Salt Lake City area, looking towards the West. This image was taken in the fall of 2001 and can be compared to identical animations using images taken at other times of the year.
Completed 2002-01-30
Maryland Drought: Side by Si …
Title Maryland Drought: Side by Side Comparison of Loch Raven in May and August, 1999
Completed 1999-09-15
Landsat 7 Rotation around Wa …
Title Landsat 7 Rotation around Washington DC
Completed 1999-06-10
Landsat 7 Zoom Down to Washi …
Title Landsat 7 Zoom Down to Washington DC
Completed 1999-06-10
Iceland Glacier Recession 19 …
Title Iceland Glacier Recession 1997 to 2000
Abstract This animation is a close up zoom into largest area of glacier recesion at the Breidamerkurjokull glacier in Iceland. The data from 1997 is taken from Landsat 5 and the 2000 data is from Landsat 7. The Breidamerkurjokull glacier in Iceland has been measured by Landsat to be receding since 1973. In 1997, Landsat 5 took several other images of the glacier. It was thought by some glacierologists that this particular glacier was receding quicker in the late 1990s than it did in the late 1980s or 1970s. After careful analysis Goddard's Glacierologist, Dorothy Hall, concluded that the recession from 1997 to 2000 occurs at a similar rate to the recession between 1973 and 2000. It is extremely controversial whether or not this recession is caused by global warming.
Completed 2001-03-22
Iceland Glacier Recession 19 …
Title Iceland Glacier Recession 1997 to 2000
Abstract This animation is a close up zoom into largest area of glacier recesion at the Breidamerkurjokull glacier in Iceland. The data from 1997 is taken from Landsat 5 and the 2000 data is from Landsat 7. The Breidamerkurjokull glacier in Iceland has been measured by Landsat to be receding since 1973. In 1997, Landsat 5 took several other images of the glacier. It was thought by some glacierologists that this particular glacier was receding quicker in the late 1990s than it did in the late 1980s or 1970s. After careful analysis Goddard's Glacierologist, Dorothy Hall, concluded that the recession from 1997 to 2000 occurs at a similar rate to the recession between 1973 and 2000. It is extremely controversial whether or not this recession is caused by global warming.
Completed 2001-03-22
Iceland Glacier Recession 19 …
Title Iceland Glacier Recession 1997 to 2000
Abstract This animation is a close up zoom into largest area of glacier recesion at the Breidamerkurjokull glacier in Iceland. The data from 1997 is taken from Landsat 5 and the 2000 data is from Landsat 7. The Breidamerkurjokull glacier in Iceland has been measured by Landsat to be receding since 1973. In 1997, Landsat 5 took several other images of the glacier. It was thought by some glacierologists that this particular glacier was receding quicker in the late 1990s than it did in the late 1980s or 1970s. After careful analysis Goddard's Glacierologist, Dorothy Hall, concluded that the recession from 1997 to 2000 occurs at a similar rate to the recession between 1973 and 2000. It is extremely controversial whether or not this recession is caused by global warming.
Completed 2001-03-22
Iceland Glacier Recession 19 …
Title Iceland Glacier Recession 1997 to 2000
Abstract This animation is a close up zoom into largest area of glacier recesion at the Breidamerkurjokull glacier in Iceland. The data from 1997 is taken from Landsat 5 and the 2000 data is from Landsat 7. The Breidamerkurjokull glacier in Iceland has been measured by Landsat to be receding since 1973. In 1997, Landsat 5 took several other images of the glacier. It was thought by some glacierologists that this particular glacier was receding quicker in the late 1990s than it did in the late 1980s or 1970s. After careful analysis Goddard's Glacierologist, Dorothy Hall, concluded that the recession from 1997 to 2000 occurs at a similar rate to the recession between 1973 and 2000. It is extremely controversial whether or not this recession is caused by global warming.
Completed 2001-03-22
Mt. Etna, Sicily on July 29, …
Title Mt. Etna, Sicily on July 29, 2001 from Landsat 7
Abstract Landsat 7 is capable of seeing in infrared, in this animation we can see the lava flows from the volcano.
Completed 2001-08-15
Mt. Etna, Sicily on July 29, …
Title Mt. Etna, Sicily on July 29, 2001 from Landsat 7
Abstract Landsat 7 is capable of seeing in infrared, in this animation we can see the lava flows from the volcano.
Completed 2001-08-15
Mt. Etna, Sicily on July 29, …
Title Mt. Etna, Sicily on July 29, 2001 from Landsat 7
Abstract Landsat 7 is capable of seeing in infrared, in this animation we can see the lava flows from the volcano.
Completed 2001-08-15
Mt. Etna, Sicily on July 29, …
Title Mt. Etna, Sicily on July 29, 2001 from Landsat 7
Abstract Landsat 7 is capable of seeing in infrared, in this animation we can see the lava flows from the volcano.
Completed 2001-08-15
Maryland Drought: Side-by-si …
Title Maryland Drought: Side-by-side Comparison of Liberty Reservoir in 1997 and 1999 (with dates)
Abstract This is a side-by-side image of Maryland's Liberty Reservoir. The image on the left is a Landsat image from July 1997. The image on the right is also a Landsat image, but it was taken in July of 1999 after two consecutive years of drought.
Completed 1999-09-15
Seasonal Change around Salt …
Title Seasonal Change around Salt Lake City: Summer
Abstract Landsat 7 imagery is combined here with terrain elevation data to create a view of the Salt Lake City area, looking towards the West. This image was taken in the summer of 2001 and can be compared to identical animations using images taken at other times of the year.
Completed 2002-01-30
Seasonal Change around Salt …
Title Seasonal Change around Salt Lake City: Summer
Abstract Landsat 7 imagery is combined here with terrain elevation data to create a view of the Salt Lake City area, looking towards the West. This image was taken in the summer of 2001 and can be compared to identical animations using images taken at other times of the year.
Completed 2002-01-30
Looking at Minnesota in Wint …
Title Looking at Minnesota in Winter
Abstract Minnesota isn't always covered in snow during winter. This is a dissolve between images of Minnesota in 2000 and 2001.
Completed 2001-04-19
Looking at Minnesota in Wint …
Title Looking at Minnesota in Winter
Abstract Minnesota isn't always covered in snow during winter. This is a dissolve between images of Minnesota in 2000 and 2001.
Completed 2001-04-19
Looking at Minnesota in Wint …
Title Looking at Minnesota in Winter
Abstract Minnesota isn't always covered in snow during winter. This is a dissolve between images of Minnesota in 2000 and 2001.
Completed 2001-04-19
Impervious Surface Cover: Pa …
Title Impervious Surface Cover: Paved Areas in DC and Baltimore
Abstract A special algorithm has been applied to the Landsat 7 image to illuminate the changes in low-density residential land use which exemplify sprawl. There is a link between impervious surfaces within a watershed, (here we see a subset of the Chesapeake Bay watershed area) and the water quality within the watershed. In general, once 10-15 % of an area is covered by impervious surfaces, increased sediments and chemical pollutants in runoff have a measurable effect on water quality. When 15-25% of a watershed is paved or impervious to drainage, increased runoff leads to reduced oxygen levels and impaired stream life. When more then 25% of surfaces are paved, many types of stream life die from the concentrated runoff and sediments.
Completed 2001-06-20
Impervious Surface Cover: Pa …
Title Impervious Surface Cover: Paved Areas in DC and Baltimore
Abstract A special algorithm has been applied to the Landsat 7 image to illuminate the changes in low-density residential land use which exemplify sprawl. There is a link between impervious surfaces within a watershed, (here we see a subset of the Chesapeake Bay watershed area) and the water quality within the watershed. In general, once 10-15 % of an area is covered by impervious surfaces, increased sediments and chemical pollutants in runoff have a measurable effect on water quality. When 15-25% of a watershed is paved or impervious to drainage, increased runoff leads to reduced oxygen levels and impaired stream life. When more then 25% of surfaces are paved, many types of stream life die from the concentrated runoff and sediments.
Completed 2001-06-20
Impervious Surface Cover: Pa …
Title Impervious Surface Cover: Paved Areas in DC and Baltimore
Abstract A special algorithm has been applied to the Landsat 7 image to illuminate the changes in low-density residential land use which exemplify sprawl. There is a link between impervious surfaces within a watershed, (here we see a subset of the Chesapeake Bay watershed area) and the water quality within the watershed. In general, once 10-15 % of an area is covered by impervious surfaces, increased sediments and chemical pollutants in runoff have a measurable effect on water quality. When 15-25% of a watershed is paved or impervious to drainage, increased runoff leads to reduced oxygen levels and impaired stream life. When more then 25% of surfaces are paved, many types of stream life die from the concentrated runoff and sediments.
Completed 2001-06-20
First Images from Landsat 7: …
Title First Images from Landsat 7: Zooming Down to Yankton, South Dakota
Abstract Zoom down to Yankton, South Dakota
Completed 1999-04-22
Maryland Drought: Side-by-si …
Title Maryland Drought: Side-by-side Comparison of Liberty Reservoir in 1997 and 1999 (without dates)
Completed 1999-09-15
Landsat 7 Fly Over of Chile
Title Landsat 7 Fly Over of Chile
Abstract Flying over the country Chile.
Completed 2000-01-01
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