Pretty sure the closest line to Miami is Jupiter and just because I keep bumping this thread does not mean I need help, it means I need more astrocartography discussion.
Miami intersects with none of the planetary/points lines on the astrocartographical map. So the astrocartography chart shows nothing special about living in Miami. Take a look at the places that are located ON the astrocartography lines. Then see which planet(s)/point(s) are stimulated at those locations. The purpose of astrocartography world maps is to help you DECIDE decide where to move to, and to see how your energy(ies) would be best used in those locations.