1982~2015年的全球陆表特征参量数据集.zip

上传者: 31988139 | 上传时间: 2021-08-16 17:19:01 | 文件大小: 44.57MB | 文件类型: ZIP
GLASS-GLC产品以1982~2015年的全球陆表特征参量数据集(GLASS CDR)为数据源,借助谷歌地球引擎(Google Earth Engine)平台进行开发,涵盖耕地、森林、草原、灌木、苔原、裸地和冰雪七大土地覆盖类别。基于全季节普适样本库,在有限样本稳定分类理论的支撑下,GLASS-GLC数据集采集了全球均匀分布、高代表性和典型性的上万个大型一致样本(Huge homogeneous samples,H-homo),并结合滤波重建的数据立方体和四维时空谱特征立方体,以及分类后时空一致性后处理,有效确保了数据产品的可靠性和地物判别的有效性。经全球独立样本库检验,GLASS-GLC数据集年平均精度达82.81%,同时还能向用户提供详细的制图不确定性空间分布图。 GLASS-GLC反映了长达34年的全球土地覆盖时空变化格局,包括热带地区耕地增加,北半球森林增加以及亚洲的草地减少等显著现象。定量分析表明,在土地覆盖显著变化地区,人类活动对环境的影响水平高达25.49%。分析结果还显示,人类活动影响与植被面积增加有很强的相关性。分析同已有土地覆盖数据产品相比,GLASS-GLC数据集具有高精度、高一致性、高可比性、更丰富类别信息和更长时间覆盖范围的特点,填补了当今世界已有制图产品的空白。

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