PROBLEM TO BE SOLVED: To create a vegetation map without additional site investigation. ! SOLUTION: A disclosed program, in one embodiment, causes a computer to execute processing to classify spectrum data of each tree type into patterns based on spectrum data whose tree type is determined to be the same type as already-known spectrum data and the tree type. Also, the disclosed program causes a computer to execute processing to specify the tree type in an area by comparing the spectrum data of the classified pattern with spectrum data of an area whose tree type is unknown. ! COPYRIGHT: (C)2014,JPO&INPIT