Set its blend mode to Soft Light and opacity to 20-30%

Final touch is another small white ellipse with blend mode = soft light and opacity = 20-30%

Now we need a satellite map in really large size. I decided to use Google maps, but if I simply make screenshot, I will not get large enough image (we really need 3000-4000 pixels size).

...so I made about 20 screenshots, scrolling map up and down...

and then pasted them all into one large Photoshop file and carefully aligned them, then merged all layers into one layer.