Файл:Lake Nasser, Egypt ESA24001610.jpeg
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ОписаниеLake Nasser, Egypt ESA24001610.jpeg |
English: Part of Lake Nasser, one of the largest artificial lakes in the world, is featured in this false-colour image captured by the Copernicus Sentinel-2 mission. Zoom in to see this image at its full 10 m resolution or click on the circles to learn more about the features in it. Lake Nasser, visible in the lower-right in black, is a vast lake and reservoir located in southern Egypt and northern Sudan. The lake was created as a result of the construction of the Aswan High Dam across the waters of the Nile in the late-1960s. This ambitious project was designed to provide irrigation to new agricultural developments and attract people to the region. The dam is located around 200 km northeast of the area pictured here and cannot be seen. The dam impounds floodwaters from the Nile, releasing them when needed to maximise their utility on irrigated land, to water hundreds of thousands of hectares of land downstream, but also in the nearby area. The dam also helps improve navigation through Aswān and generates an enormous amount of hydroelectric power. The lake covers a total surface area of 5250 sq km, yet is relatively shallow with an average depth of 25 m. The ancient Egyptian temple of Abu Simbel laid in the path of the rising waters produced by the dam, resulting in the relocation of the temple complex. In the 1960s, the historical site was taken apart piece by piece and reassembled in a new location to avoid submersion. Although the resolution of the image doesn’t allow us to see the temple in detail, the town of Abu Simbel and its airport can be spotted at the bottom of the image, close to several plantations seen in red. Part of the Toshka Lakes, natural depressions that are filled by overflow from Lake Nasser, can be seen in the top-left of the image. These endorheic lakes were created in the 1980s and 1990s by the diversion of water from Lake Nasser through the manmade canal visible in green in the image. The rise and fall of the lakes depend on multi-year fluctuations in water flow from the Nile. From 2012 to 2018, the lakes had shrunk significantly, leaving only small remnants of water in the basins. Summer rainfall in Sudan in 2019 and record-breaking floods in 2020, resulted in the rapid filling of the lake’s waters. The lakes are relatively salty, with visible signs of eutrophication and algae formation. This image is a false-colour composite and was created by utilising the near-infrared channel from Copernicus Sentinel-2 to emphasise the scarce vegetation in the area. This helps identify the presence of pivot irrigation fields, visible as circular shapes in the image, with the largest having a diameter of around 750 m. Pivot irrigation systems work where watering equipment rotates around a fixed water supply point and crops are watered with sprinklers. This type of irrigation helps farmers manage their watering demands and helps conserve their water sources. The image is also featured on the Earth from Space video programme. |
Дата | 18 марта 2022 (дата загрузки) |
Источник | Lake Nasser, Egypt |
Автор | European Space Agency |
Другие версии |
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Activity InfoField | Observing the Earth |
Mission InfoField | Sentinel-2 |
Set InfoField | Earth observation image of the week |
System InfoField | Copernicus |
Лицензирование
This image contains data from a satellite in the Copernicus Programme, such as Sentinel-1, Sentinel-2 or Sentinel-3. Attribution is required when using this image.
Атрибуция: Contains modified Copernicus Sentinel data 2022
Attribution
The use of Copernicus Sentinel Data is regulated under EU law (Commission Delegated Regulation (EU) No 1159/2013 and Regulation (EU) No 377/2014). Relevant excerpts:
Free access shall be given to GMES dedicated data [...] made available through GMES dissemination platforms [...].
Access to GMES dedicated data [...] shall be given for the purpose of the following use in so far as it is lawful:
GMES dedicated data [...] may be used worldwide without limitations in time.
GMES dedicated data and GMES service information are provided to users without any express or implied warranty, including as regards quality and suitability for any purpose. |
Attribution
This media was created by the European Space Agency (ESA).
Where expressly so stated, images or videos are covered by the Creative Commons Attribution-ShareAlike 3.0 IGO (CC BY-SA 3.0 IGO) licence, ESA being an Intergovernmental Organisation (IGO), as defined by the CC BY-SA 3.0 IGO licence. The user is allowed under the terms and conditions of the CC BY-SA 3.0 IGO license to Reproduce, Distribute and Publicly Perform the ESA images and videos released under CC BY-SA 3.0 IGO licence and the Adaptations thereof, without further explicit permission being necessary, for as long as the user complies with the conditions and restrictions set forth in the CC BY-SA 3.0 IGO licence, these including that:
See the ESA Creative Commons copyright notice for complete information, and this article for additional details.
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Этот файл доступен по лицензии Creative Commons Attribution-Share Alike 3.0 IGO. Атрибуция: ESA, CC BY-SA IGO 3.0
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Ширина | 7334 пикс. |
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Высота | 8468 пикс. |
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Цветовая модель | RGB |
Ориентация кадра | Нормальная |
Количество цветовых компонентов | 3 |
Горизонтальное разрешение | 72 точек на дюйм |
Вертикальное разрешение | 72 точек на дюйм |
Программное обеспечение | Adobe Photoshop 22.4 (Windows) |
Дата и время изменения файла | 09:02, 16 февраля 2022 |
Версия Exif | 2.31 |
Цветовое пространство | Некалиброванное |
Дата и время оцифровки | 11:11, 15 февраля 2022 |
Дата последнего изменения метаданных | 10:02, 16 февраля 2022 |
Уникальный идентификатор исходного документа | xmp.did:7ec6366e-eda0-864a-881a-c18b9a1db2be |