Forest canopy cover represents different characteristics of forest stands. However, especially in semiarid forest, the estimation of canopy cover by field measurements is so expensive. Therefore, it is necessary to develop appropriate techniques to estimate forest canopy cover for using in forest management in semiarid areas. In this research, a robust procedure to estimate canopy cover using stratification field sampling and AdaBoostM1 machine learning algorithm with Landsat 8 OLI imagery is suggested. Approximately, 29000 ha of semiarid forest (Manesht and Ghelarang protected area) in west of Iran was selected as the study area. The unsupervised classification was used on NDVI layer extracted from OLI data and NEYMAN method was applied for allocating, in stratified areas. The crown cover was measured in percentage in each plot. In inaccessible plots, the optical satellite imagery of Worldview-2 from Google Earth database were used (0.46 m spatial resolution). For the classification of canopy cover, the AdaBoostM1 algorithm with random forest classifier trained by 75% split original data; while 25% reminder data was used for accuracy assessment using ROC curve, TP (True Positive), FP (False Positive), OA (overall accuracy) and K (kappa coefficient). The results showed the overall accuracy and kappa coefficient 91% and 0.88 respectively. Based on the results, the methodology developed in this study is suitable to estimate canopy cover in semiarid forests.
کلید واژگان :AdaBoostM1, Neyman allocation, Random Forest, Stratified Sampling
ارزش ریالی : 600000 ریال
با پرداخت الکترونیک