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| Landsat images | |
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| Tweet Topic Started: Jan 14 2011, 05:34 PM (491 Views) | |
| Michelle | Jan 14 2011, 05:34 PM Post #1 |
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This is weird: it appears to be radar-generated Here's the description: Portland, the largest city in Oregon, is located on the Columbia River at the northern end of the Willamette Valley. On clear days, Mount Hood highlights the Cascade Mountains backdrop to the east. The Columbia is the largest river in the American Northwest and is navigable up to and well beyond Portland. It is also the only river to fully cross the Cascade Range, and has carved the Columbia River Gorge, which is seen in the left-central part of this view. A series of dams along the river, at topographically favorable sites, provide substantial hydroelectric power to the region. This perspective view was generated using topographic data from the Shuttle Radar Topography Mission (SRTM), a Landsat satellite image, and a false sky. Topographic expression is vertically exaggerated two times. Landsat has been providing visible and infrared views of the Earth since 1972. SRTM elevation data substantially help in analyzing Landsat images by revealing the third dimension of Earth’s surface, topographic height. The Landsat archive is managed by the U.S. Geological Survey’s EROS Data Center (USGS EDC). Size: View width 88 kilometers (49 miles), View distance 106 kilometers (66 miles) Location: 45.5 degrees North latitude, 122.5 degrees West longitude Orientation: View East-Southeast, 10 degrees below horizontal, 2 times vertical exaggeration Image Data: Landsat Bands 3, 2, 1 as red, green, blue, respectively Date Acquired: February 2000 (SRTM), August 10, 1992 (Landsat) Here's another nice one - island of Ekarma: Edited by Michelle, Jan 14 2011, 05:36 PM.
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| CJ | Jan 16 2011, 01:06 AM Post #2 |
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A very minor case of serious brain damage
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This is all very interesting, but what are the advantages of doing it like this when you can just take photos? |
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| Michelle | Jan 16 2011, 04:43 PM Post #3 |
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Because it's more fascinating. |
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| CJ | Jan 16 2011, 09:52 PM Post #4 |
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A very minor case of serious brain damage
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I guess so. What I'm asking, though, is whether radar-generated is more useful in any way? |
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| Michelle | Jan 16 2011, 11:53 PM Post #5 |
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I think radar actually finds things that photographs can't. |
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| CJ | Apr 15 2014, 11:58 PM Post #6 |
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A very minor case of serious brain damage
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Here's an image by Landsat 7, which shows Adam's Bridge, between India and Sri Lanka:![]() It's believed that it was entirely above land until it was destroyed by a typhoon in around 1480 - so it used to be possible to walk from India to Sri Lanka. |
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