File:Guam space image (cropped).jpg
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Summary
[edit]DescriptionGuam space image (cropped).jpg |
English: On December 30, 2011, cloud-free skies presented NASA’s Earth Observing-1 (EO-1) satellite with this unobstructed view of the island of Guam. Note that this image, taken by the satellite’s Advanced Land Imager (ALI), has been rotated and north is at right.
Located in the tropical Pacific Ocean, the U.S. territory of Guam lies at the southern end of the Mariana Island Chain. As the largest island in that archipelago, Guam stretches roughly 30 miles (50 kilometers) from northeast to southwest. Fields, forests, military bases, and settlements all mix on the landscape. Two prominent airstrips run northeast-southwest, one at the northeastern tip of the island, and the other in central Guam. Guam has two seasons: wet (June to December) and dry (January to June), and ALI acquired this image during the transition from wet to dry. The fate of that rainwater has a lot to do with whether it lands in the northern or southern part of the island. In southern Guam, volcanic rock predominates, but in northern Guam, limestone overlies volcanic rock. Limestone is porous—so porous, in fact, that practically all the water in northern Guam infiltrates the rock. After percolating through the limestone, water in northern Guam becomes part of the groundwater system. Guam’s rivers are confined to the southern part of the island, where less porous volcanic rock enables water to collect on the surface. Coral reefs fringe the island, and they are especially visible around Apra Harbor and Cocos Lagoon. Shallow water along these reefs glows peacock blue. Not far from Guam, the ocean is anything but shallow. Just east of the Mariana Islands lies the Mariana Trench. Located at the boundary between tectonic plates, it is the deepest point in the Earth’s ocean. References
NASA Earth Observatory image created by Jesse Allen and Robert Simmon, using EO-1 ALI data provided courtesy of the NASA EO-1 team and the United States Geological Survey. Caption by Michon Scott. Instrument: EO-1 - ALI |
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Source | http://earthobservatory.nasa.gov/IOTD/view.php?id=77189 | |||
Author | NASA | |||
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[edit]Public domainPublic domainfalsefalse |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ![]() |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:10, 10 February 2020 | ![]() | 3,737 × 4,738 (4.9 MB) | Niklem (talk | contribs) | File:Guam ali 2011364 lrg.jpg cropped 7 % horizontally, 21 % vertically using CropTool with precise mode. |
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Width | 5,491 px |
Height | 11,161 px |
Bits per component |
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Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 100 dpi |
Vertical resolution | 100 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CS5 Macintosh |
File change date and time | 11:30, 16 February 2012 |
Color space | Uncalibrated |
Date and time of digitizing | 07:48, 1 February 2012 |
Date metadata was last modified | 06:30, 16 February 2012 |
Unique ID of original document | xmp.did:FB7F117407206811AA97CCED880B21C1 |