Pl program is detailed in "Create geographical plots of your data using Perl, GD, and plot-latlong."

“使用Perl、GD和plot - latlong创建数据的地理标绘”这篇文章详细描述了worldCompositeMap . pl程序。

youdao

In its simplest state, this is geographical data with a timestamp, but when you plot this data onto the scenery of a map and then create a shifting window into the scene through the sequence of time, you create a data-driven story.

FORBES: Why Animated Data Maps Work So Well