PHOTOSHOP layer to deal with the problem

Superposition of two layers, the smaller the above, the small layer to the edge gradually to dim light down, the transition out how to do it? Advice please, thank you!

small map, you can add a mask with Mask, emergence, transparency, and so on, a lot of ways, you can find online photoshop Mask course, this effect can be achieved right away.Mask, the Mask can be added gradually as a constituency.'s Emergence in the toolbar in tune.You are above that layer is a picture or do their own layer ah ? If the other is a picture that you have an approach they say is required to do, is to use the best emergence 1, 10, if they do then you layer it does not have to be amended to gradually 1, 10