Evaluation method of standing trees in forest areas, and boundary survey method suitable for identifying the evaluation target area in this evaluation method

摘要

PROBLEM TO BE SOLVED: To extract a standing tree apex using a grid of reference values suitable for an evaluation target area, calculate the number of standing trees with little error, measure an accurate reference point by surveying with shooting data, and use this reference. By performing compass surveys for many of the boundaries using points, provide a boundary survey method that can perform boundary surveys with high efficiency and accuracy, especially in forest areas. SOLUTION: In the representative area internal tree vertex determination step or the evaluation target area internal tree vertex determination step, the inside of the grid including the extracted vertices is divided into a plurality of sections, and the highest position data in the divided sections is divided. If the height data value is extracted and the height data value of the highest position data of any one of the partitions adjacent to the partition containing the vertices is larger than the height data value of the extracted vertices, the extracted vertices Is not a standing tree vertex. [Selection diagram] Fig. 1