The USGS Landsat Project has expanded its free data acquisitions to EurAsia. As near cloud-free scenes are acquired by Landsat 7, they are automatically processed and placed out for users to download at no charge. Because only a portion of the globe is collected daily, and some of it cloud-covered, not all areas of EurAsia are equally available at all times. To view and download this data, please visit the Standard L1T dataset in the Landsat Science Collection in GloVis or Earth Explorer.
+ Visit USGS Landsat website

Above the Earth, Below the Surface: Landsat’s Role in Monitoring Water Quality
Safeguarding freshwater resources is crucial, and while scientists use a variety of ground-based techniques to gauge water quality, the Landsat program has provided water quality data from orbit for decades.