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PImage mymap;
// Latitude, Longitude: 52.41369, 13.04992

float lat = 52.41369;
float lon = 13.04992;
float x = 0;
float y = 0;


void setup() {
  mymap = loadImage("world.png");
  size(mymap.width, mymap.height);
  x = map(lon, -180, 180, 0, width);
  y = map(lat, 90, -90, 0, height);
}

void draw() {
  image(mymap, 0, 0);
  ellipse(x,y,10,10);
}