The Landsat 8 OLI imagery can be downloaded for free via earthexplorer.usgs.gov. You must login first to get it. Find your location by scrolling and enlarging the existing image on the right side of the web. Make sure the location that you want is right. Mark these location by clicking one of the points of the site. For example, I searched for image of Gunungsewu in Gunungkidul District, Yogyakarta Province, Indonesia. I click on a place in the area of Gunungsewu depicted in the web image. A red symbol will appear and the location coordinate will appear in the box on the left.
|A red mark appear on the web image|
|The location coordinate of the mark|
The capacity of the data may be very large. Speed up your internet access will determine the download time. Congratulation.