跳转到内容

File:Lake Chad’s shrinking waters ESA418540.gif

页面内容不支持其他语言。
这个文件来自维基共享资源
维基百科,自由的百科全书

原始文件 (2,802 × 2,802像素,文件大小:11.7 MB,MIME类型:image/gif、​循环、​2帧、​6.0秒)


摘要

描述
English: The 22 March isWorld Water Day, which focuses on the importance of freshwater. The Sustainable Development Goals of the United Nations aim to achieve a better and more sustainable future. Goal number 6 focuses on ensuring the availability and sustainable management of water for all by 2030. This image takes us over Lake Chad at the southern edge of the Sahara, where water supplies are dwindling.

This comparison shows Lake Chad imaged on 6 November 1984 by the US Landsat 5 satellite and on 31 October 2018 by the Copernicus Sentinel-2A satellite. The rapid decline of the lake’s waters in just 34 years is clear to see. Once one of Africa’s largest lakes, Lake Chad has shrunk by around 90% since the 1960s. This receding water is down to a reduction of precipitation, induced by climate change, as well as development of modern irrigation systems for agriculture and the increasing human demand for freshwater. Straddling the border of Chad, Niger, Cameroon and Nigeria, the lake is a major source of freshwater for millions of people in the area. It is also a source for irrigation, fishing and it was once rich in biodiversity. As the lake continues to dry up, many farmers and herders move towards greener areas or move to larger cities to seek alternative work. Several attempts have been made to replenish these shrinking waters, however little progress has been achieved. The borders of the lake’s body are only partly visible in the most-recent image – as the majority of the shoreline is swamp and marsh. The Chari River, visible snaking its way towards Lake Chad at the bottom of the image, provides over 90% of the lake’s waters. It flows from the Central African Republic following the Cameroon border from N'Djamena, where it joins with its main tributary the Logone River.  The demand for water is growing inexorably. Access to water is vital – not only for drinking, but also for agriculture, energy and sanitation. By providing measurements of water quality and detecting changes, the Copernicus Sentinel-2 mission can support the sustainable management of water resources. These images are also featured on theEarth from Space video programme.  

UN Sustainable Goal 6 is crystal clear: Water for all by 2030. SDG6 includes a target to ensure availability and sustainable management of water for all by 2030. For World Water Day we take a look at ways that space can help this global challenge. While Earth-observing satellites monitor our precious water resources, technologies developed for human space missions also serve global needs in harsh environments here on Earth.
日期
来源 http://www.esa.int/spaceinimages/Images/2019/03/Lake_Chad_s_shrinking_waters
作者 European Space Agency
授权
(二次使用本文件)
contains modified Copernicus Sentinel data (2018), processed by ESA (For Landsat image: USGS/ESA),CC BY-SA 3.0 IGO
Title
InfoField
Lake Chad’s shrinking waters
System
InfoField
Landsat-5
Set
InfoField
Earth observation image of the week
Mission
InfoField
Sentinel-2
Activity
InfoField
Observing the Earth

许可协议

w:zh:知识共享
署名 相同方式共享
您可以自由地:
  • 共享 – 复制、发行并传播本作品
  • 修改 – 改编作品
惟须遵守下列条件:
  • 署名 – 您必须对作品进行署名,提供授权条款的链接,并说明是否对原始内容进行了更改。您可以用任何合理的方式来署名,但不得以任何方式表明许可人认可您或您的使用。
  • 相同方式共享 – 如果您再混合、转换或者基于本作品进行创作,您必须以与原先许可协议相同或相兼容的许可协议分发您贡献的作品。
© 此图像包含来自哥白尼计划中的卫星的数据,例如哨兵1号哨兵2号哨兵3号。使用此图片时需要注明出处。
署名: 包含修改后的哥白尼哨兵数据{{{year}}}

哥白尼哨兵数据的使用受欧盟法律监管(委员会授权条例 (EU) No 1159/2013条例 (EU) No 377/2014)。相关摘录:


财务状况

应免费访问通过GMES传播平台提供的GMES专用数据[...]。

使用条件

在合法的范围内应出于以下用途的目的访问GMES专用数据[...]:

  1. 再生产;
  2. 分配;
  3. 与公众沟通;
  4. 适应、修改和与其他数据和信息的组合;
  5. (a) 至 (d) 点的任意组合。

GMES专用数据[...]可在全球范围内不受时间限制地使用。

关于用户提供信息的条件
  1. 在向公众分发或传播GMES专用数据[...]时,用户应告知公众该数据和信息的来源。
  2. 用户应确保不要向公众传达用户活动得到联盟正式认可的印象。
  3. 如果该数据或信息已被调整或修改,用户应明确说明这一点。
没有保修

向用户提供GMES专用数据和GMES服务信息没有任何明示或暗示的保证,包括关于质量和任何目的的适用性。

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描绘内容

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2019年4月3日 (三) 12:242019年4月3日 (三) 12:24版本的缩略图2,802 × 2,802(11.7 MB)European Space Agency, Id 418540, http://www.esa.int/spaceinimages/Images/2019/03/Lake_Chad_s_shrinking_waters, User:Fæ/Project_list/ESA

以下页面使用本文件:

全域文件用途

以下其他wiki使用此文件:

元数据