Abstract
The increase of CO2 absorption by afforestation and reforestration is regarded as the decrease of greenhouse effect gas discharge in the Kyoto protocol. Therefore, it is necessary to monitor forest change in a wide area. For the purpose of monitoring forest area change widely, two methods were developed for measuring the crown cover ratio of forest by using aerial photograph or airborne laser scanner. In the further study, the method to measure the diameter at breast height (DBH) of trees was developed by using ground-based laser scanner. We obtained good results, whereas it is necessary to improve and validate these methods.
