To calculate forest resource information with high accuracy even in forests in which there are differences in timber density, tree height, and crown size.SOLUTION: A forest resource information calculation method includes: a survey target forest area image data creation processing step (step S30) of creating survey target forest area image data on the basis of 3D point group data and geographical information; crown height image data creation processing step (step S40) of creating crown height image data representing the height of the crown of each tree existing in a survey target forest area as the crown height; and hierarchical tree vertex extraction processing step (step S50) of extracting, for each hierarchy, tree vertices of crowns in which the tree vertices are present in respective hierarchies including a first hierarchy, when the first hierarchy is defined as a hierarchy in which the maximum crown height is present among crown heights obtained from the crown height image data, and a plurality of hierarchies having a predetermined hierarchy width from the maximum crown height are set from the first hierarchy to a ground surface.SELECTED DRAWING: Figure 1
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