Dear Tofig,

this question was asked before with several answers:

https://www.researchgate.net/post/C

an_anyone_suggest_some_free_remote_sensing_data

Besides, you can always use Amazon Servers for L7/L8 Images.

https://docs.opendata.aws/landsat-pds/readme.html

Ulf Mallast thanks for reply. Will follow the mentioned link

You can use the Google earth engine (GEE)for downloading any Landsat data with or without atmospheric and radiometric correction.

https://cloud.google.com/storage/docs/public-datasets/landsat

We have already used these data for your research.

Article The Impacts of Landscape Changes on Annual Mean Land Surface...

https://earthexplorer.usgs.gov/

You get all data this link

thank you for your information

Besides the USGS Glovis website, you can download the Landsat 7 (ETM+) images from the following websites

1. Earth Explorer http://earthexplorer.usgs.gov

2. LandsatLook Viewer https://landsatlook.usgs.gov/

3. EO Browser https://apps.sentinel-hub.com/eo-browser/

3. Global Land Cover https://landsat.gsfc.nasa.gov/data/more-free-data/

Please see attached manual containing steps to downloading (FREE) satellite images from the website.