currently planning to create a dotted map of the world - any ideas here

[Ofnuts]

• Create/obtain a black on white or white on black image of the map at the adequate scale.
  
• In the Channels list drag any of the RGB channels to the list below to copy it
  
• Add a background layer (if necessary)
  
• Add a layer and fill with the dots pattern
  
• Layer > Mask > Add layer mask and select the channel copy you did before. If the map is black on white, tick the Invert mask (or use Colors > Invert later), the goal being to have white (where you want the dots)
  
• Filters > Blur > Pixelize (which should apply to the mask). The block size should be identical to the dot pattern size, and aligned with it (which it will be if you don't try to do clever things). Some of the dots won't be fully opaque at that point.
  
• Colors > Threshold on the mask to make the dots fully opaque or fully transparent