How to achieve a dotted landscape i try to achieve a dotted landscape like in this example.

I tried to solve it by an array but i dint get the landscape displacement to work.
an easy way would be to add a sphere to each point of a landscape mesh but i don't know how to do this.
Sorry if this is easy to solve, but i am kinda new to blender.
You can do the texture using a brick texture node.

Then use a displacement modifier a highly subdivided plane.
For the displacement use a texture that as a height map for your landscape.

For more detail read:
Landscape topography from grayscale image
For the glow use a glare node.