In October 2006, a cyclone created very strong winds in the northern part of Hokkaido, Japan, causing large-scale windfall forest damage in the town of Shimokawa. We were asked to estimate the damage using remote-sensing from the perspective of organizations in Shimokawa. Therefore, we applied remote-sensing techniques using ALOS satellite images to estimate the distribution and area of the windfall damage and provided the results to relevant organizations. Subsequently, we investigated how the various organizations used the analysis results. The analysis contributed to reducing the effort exerted in field surveys and the rapid provision of results was more important than accuracy.