Maps are useful to human beings. With the help of maps, people explore or compare their surrounding area. Sometimes they need to compare two maps side by side to see the difference in real time. For example, you might want to check a satellite imagery side by side with terrain maps to see where the mountains are.
You already know how to create a map from the previous chapters. So, only additional code lines are written.
You can find the source code at
If you want to create two maps that ...