improved canopy height

The airborne LiDAR data was used as a reference to improve the canopy height products derived from the spaceborne LiDAR systems GEDI and ICESat-2. In the dataset, the attribute "predicted" represents the improved canopy height.The data within the airborne LiDAR coverage have been validated and evaluated. However, for the other datasets, their broader spatial extent may be affected by the representativeness and spatial distribution of the samples.本数据集以机载激光雷达（airborne LiDAR）数据作为参考基准，对星载激光雷达（spaceborne LiDAR）系统GEDI与ICESat-2获取的冠层高度产品进行优化。本数据集中，"predicted"属性字段代表经优化后的冠层高度值。机载激光雷达覆盖区域内的数据集已完成验证与评估工作。但对于其余数据集而言，其覆盖的更广空间范围可能会受到样本代表性与空间分布的影响。