Forest Inventory and Analysis Juniperus NDVI Ruoergai area Savitzky–Golay filtering Sentinel-2 above-ground biomass aerial images allometric equation canopy height model degradation forest change forest cover map forest monitoring forest sampling geospatial–temporal analysis individual tree crown inventory efficiency land cover classification land-use multisensory approach n/a national forest inventory regeneration remote sensing satellite remote sensing segmentation spatial and temporal analysis thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general trend