I'm new to After Effects and wondering how that's possible to animate opening for this map so each dot appears individually? I know how to make the opening using the mask but it shows the edges while I'd like to have "popping one by one dots" animation.Please see image below:
This tutorial can help you:
You will find there how to make dotted effect from scratch (use outlines of the map). Then you shall add some key-frames for animation.
To make dots appear more random, you can use Fractal Noise as animated mask.
Check this out: http://misterhorse.tv/new-feature-stagger-layers/
Let's you randomize the order layers appear in.
I ended up animating this map manually. The easiest way to me was to animate dots frame by frame in Flash and import movie to AE.