SATELLITE Pictures

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در این تاپیک عکس های زمین که توسط برنامه های Google EARTH و nasa world win گرفته شدن رو قرار میدیم .
دوستانی که سرعت مودمشون بالاست و برنامه های بالا رو دارن لطفا کمک کنن .

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The Aral Sea on June 4, 1977, Sept. 17, 1989, and May 27, 2006. Image courtesy of USGS.

Aral Sea
The Aral Sea lies between Uzbekistan (to the south) and Kazakhstan (to the north). Once the fourth largest lake in the world, the Aral Sea is now less than half of its original size. The Aral Sea is a terminal, or endorheic, sea (meaning no water flows out of it). It is fed by the Syr Darya and the Amu Darya Rivers, but Soviet river diversions for irrigation made over 40 years ago have starved the Aral Sea of water.

In 2001, the World Bank funded the construction of an 8-mile dam to separate the North and South Aral, and thereby save the smaller and less polluted North Aral Sea. The North Aral has been growing since completion of the Kok-Aral Dam in the summer of 2005. Repairs and updates to the inefficient Soviet-era canals have also played a role in the rejuvenation of the North Aral.

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فکر کنم نام گذاری این تاپیک خوب نباشه
حالا ولش هرچی شد شد دیگه
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Tropical Storm Isidore

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Credit
Data courtesy Landsat 7 project and EROS Data Center. Caption by James Foster, NASA Goddard Space Flight Center.

Mount St. Helens Rebirth


The catastrophic eruption of Mt. St. Helens 20 years ago today (on May 18, 1980), ranks among the most important natural events of the twentieth century in the United States. Because Mt. St. Helens is in a remote area of the Cascades Mountains, only a few people were killed by the eruption, but property damage and destruction totaled in the billions of dollars.

Mount St. Helens is an example of a composite or stratovolcano. These are explosive volcanoes that are generally steep-sided, symmetrical cones built up by the accumulation of debris from previous eruptions and consist of alternating layers of lava flows, volcanic ash and cinder. Some of the most photographed mountains in the world are stratovolcanoes, including Mount Fuji in Japan, Mount Cotopaxi in Ecuador, Mount Hood in Oregon, and Mount Rainier in Washington. The recently erupting Mount Usu on the island of Hokkaido in Japan is also a stratovolcano. Stratovolcanoes are characterized by having plumbing systems that move magma from a chamber deep within the Earth's crust to vents at the surface.

The height of Mt. St. Helens was reduced from about 2950 m (9677 ft) to about 2550 m (8364 ft) as a result of the explosive eruption on the morning of May 18. The eruption sent a column of dust and ash upwards more than 25 km into the atmosphere, and shock waves from the blast knocked down almost every tree within 10 km of the central crater. Massive avalanches and mudflows, generated by the near-instantaneous melting of deep snowpacks on the flanks of the mountain, devastated an area more than 20 km to the north and east of the former summit, and rivers choked with all sorts of debris were flooded more than 100 km away. The area of almost total destruction was about 600 sq. km. Ash from the eruption cloud was rapidly blown to the northeast and east producing lightning which started many small forest fires. An erie darkness caused by the cloud enveloped the landscape more than 200 km from the blast area, and ash could be seen falling from the sky over the Great Plains, more than 1500 km distant.

This image was acquired by Landsat 7 on Aug. 22, 1999. It was produced at 30-m resolution using bands 3, 2, and 1 to display red, green, & blue, respectively ("true color"). Some of the effects of the massive eruption on May 18, 1980, can still be seen clearly, especially on the northern and eastern flanks of Mount St. Helens, which are still mostly barren (shades of white and gray). The crater is in the center of the image. Note the streaking from the crater (gray on the image). These are the remnants of pyroclastic flows (superheated avalanches of gas, ash and pieces of rock) that carved deep channels down the slopes and onto the relatively flat areas near the base of the mountain. The partially-filled Spirit Lake can be seen just to the northeast of the crater (blue-black on the image), and the where most of the energy was directed during the blast is the gray area immediately to the northwest of the crater. However, on other parts of the mountain, the rejuvenation process is obvious. Ash deposits have supplied minerals which have accelerated vegetation growth (various shades of green). Though far from what it looked like 20 years ago, Mount St Helens is actively recovering.

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Dasht-e Kevir (Great Salt Desert, Iran)

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Credit
<P> Image provided by the USGS EROS Data Center Satellite Systems Branch</P> <P> <IMG SRC="/Newsroom/NewImages/Images/usgs_logo.gif" WIDTH=167 HEIGHT=62 HSPACE=0 VSPACE=0 BORDER=0> </P>

The Dasht-e Kevir, or Great Salt Desert, is the largest desert in Iran. It is primarily uninhabited wasteland, composed of mud and salt marshes covered with crusts of salt that protect the meager moisture from completely evaporating.

This image was acquired by Landsat 7’s Enhanced Thematic Mapper plus (ETM+) sensor on October 24, 2000. This is a false-color composite image made using infrared, green, and red wavelengths. The image has also been sharpened using the sensor’s panchromatic band.

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Credit
ISS005-E-11900, taken 31 August 2002, was provided by the Earth Sciences and Image Analysis Laboratory at Johnson Space Center. Additional images taken by astronauts and cosmonauts can be viewed at the NASA-JSC Gateway to Astronaut Photography of Earth.


Kharg Island is Iran’s primary oil export terminal in the Persian Gulf. This rocky limestone island is unique because it is one of the few islands in the Persian Gulf with freshwater which has collected within the porous limestone. In addition to its commercial and strategic importance, the freshwater has biological importance, supporting populations of gazelles. This high-resolution photograph taken by astronauts on board the International Space Station shows detail of the tanker dock facilities, tanks and other infrastructure. Sunglint on the surface of the water highlights small amounts of oil on the sea surface and reveals the direction of the local currents.

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Credit
Astronaut photograph ISS010-E-13393 was acquired January 15, 2005 with a Kodak 760C digital camera with a 400 mm lens, and is provided by the ISS Crew Earth Observations experiment and the Image Science & Analysis Group, Johnson Space Center. The International Space Station Program supports the laboratory to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth.

Located approximately 50 kilometers northeast of Tehran, Mt. Damavand is an impressive stratovolcano that reaches 5,670 meters (18,598 feet) in elevation. Part of the Alborz Mountain Range that borders the Caspian Sea to the north, Damavand is a young volcano that has formed mostly during the Holocene Epoch (over approximately the last 10,000 years). The western flank of the volcano includes solidified lava flows with flow levees—“walls” formed as the side edges of flowing lava cooled rapidly, forming a chute that channeled the hotter, interior lava. Two such flows with well-defined levees are highlighted by snow on the mountainside.

Damavand is the highest peak in Iran and the highest volcano in the Middle East. The mountain and its surrounding areas are popular hiking, climbing, and skiing destinations. While no historic eruptions of the volcano are recorded, hot springs on the flanks of the volcano and fumaroles (steam vents) in the summit crater suggest that a hot or cooling magma body is still present beneath the volcano. This continuing activity, while minor, indicates a dormant rather than extinct volcano.

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Earthquake near Bam, Iran


A powerful earthquake struck southeastern Iran on December 26, 2003, killing thousands and destroying much of the city of Bam.

This one-meter resolution satellite image of Bam, Iran was taken by Space Imaging's IKONOS satellite on Dec. 27, 2003, just one day after a catastrophic earthquake struck the historic city. The image shows widespread destruction as a result of the 6.7 magnitude earthquake that leveled 70 percent of the buildings according to news reports.

Clearly seen in this image is the 2,000-year-old citadel, considered the world's largest mud fortress. According to news reports, much of the medieval fortress crumbled like a sand castle when the quake hit. The citadel was a popular tourist attraction and is on the register of the U.N. Educational, Scientific and Cultural Organization and has been a World Heritage site.

Bam is located about 1,000 km (620 miles) southeast of Tehran.