We have a variety of classification conditions on coals, for example, the utility, the origin, the rank and so on. In this report, we fabricated a map, a birds-eye view from the standing point of a variety of spectroscopy (Infrared spectroscopy and others). We used a principal component analysis and made the map indicating the relation among colas all over the world, and classified them by the production nations using classification trees. As a result, we found that the splitting rules for identifying the production district of coals.
