File:Light pollution US map.jpg
![File:Light pollution US map.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Light_pollution_US_map.jpg/800px-Light_pollution_US_map.jpg?20211220083104)
Original file (3,023 × 1,311 pixels, file size: 1.53 MB, MIME type: image/jpeg)
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Summary
[edit]DescriptionLight pollution US map.jpg |
English: This image of the Earth at night is a composite assembled from data acquired by the Suomi National Polar-orbiting Partnership (Suomi NPP) satellite over nine days in April 2012 and thirteen days in October 2012. It took 312 orbits and 2.5 terabytes of data to get a clear shot of every parcel of the earth’s land surface and islands.
The night time view of the earth was made possible by the "day-night band" of the Visible Infrared Imaging Radiometer Suite. VIIRS detects light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe dim signals such as gas flares, auroras, wildfires, city lights, and reflected moonlight. In this case, auroras, fires, and other stray light have been removed to emphasize the city lights. Named for satellite meteorology pioneer Verner Suomi, NPP flies over any given point on the earth’s surface twice each day at roughly 1:30 am and 1:30 pm. The spacecraft flies 824 kilometres (512 miles) above the surface in a polar orbit, circling the planet about 14 times a day. Suomi NPP sends its data once per orbit to a ground station in Svalbard, Norway, and continuously to local direct broadcast users distributed around the world. The mission is managed by NASA with operational support from NOAA and its Joint Polar Satellite System, which manages the satellite's ground system. |
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Date | (photographed in April and October 2012) | |||
Source | NASA Earth Observatory | |||
Author | NASA Earth Observatory | |||
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Comment InfoField | Source provides even larger image sizes up to 54,000 × 27,000 pixels, also tiled |
Licensing
[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 | 08:31, 20 December 2021 | ![]() | 3,023 × 1,311 (1.53 MB) | SHB2000 (talk | contribs) | File:The earth at night (2).jpg cropped 77 % horizontally, 81 % vertically using CropTool with precise mode. |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Author | Picasa |
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Date and time of data generation | 23:42, 2 April 2014 |
Width | 13,500 px |
Height | 6,750 px |
Bits per component |
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Compression scheme | LZW |
Pixel composition | RGB |
Number of components | 3 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CS6 (Windows) |
File change date and time | 00:06, 3 April 2014 |
Exif version | 2.2 |
Color space | Uncalibrated |
Unique image ID | b052207d2ee7046a1864a1868354cc67 |
Date and time of digitizing | 06:06, 27 November 2012 |
Date metadata was last modified | 06:09, 27 November 2012 |
Unique ID of original document | xmp.did:29270E01DE38E211A222F9A8B281B3E7 |
IIM version | 4 |