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Mapping forests in monsoon Asia with ALOS PALSAR 50-m mosaic images and MODIS imagery in 2010

机译:使用ALOS PALSAR 50米马赛克图像和MODIS图像在2010年绘制季风亚洲的森林

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摘要

Extensive forest changes have occurred in monsoon Asia, substantially affecting climate, carbon cycle and biodiversity. Accurate forest cover maps at fine spatial resolutions are required to qualify and quantify these effects. In this study, an algorithm was developed to map forests in 2010, with the use of structure and biomass information from the Advanced Land Observation System (ALOS) Phased Array L-band Synthetic Aperture Radar (PALSAR) mosaic dataset and the phenological information from MODerate Resolution Imaging Spectroradiometer (MOD13Q1 and MOD09A1) products. Our forest map (PALSARMOD50 m F/NF) was assessed through randomly selected ground truth samples from high spatial resolution images and had an overall accuracy of 95%. Total area of forests in monsoon Asia in 2010 was estimated to be ~6.3 × 106 km2. The distribution of evergreen and deciduous forests agreed reasonably well with the median Normalized Difference Vegetation Index (NDVI) in winter. PALSARMOD50 m F/NF map showed good spatial and areal agreements with selected forest maps generated by the Japan Aerospace Exploration Agency (JAXA F/NF), European Space Agency (ESA F/NF), Boston University (MCD12Q1 F/NF), Food and Agricultural Organization (FAO FRA), and University of Maryland (Landsat forests), but relatively large differences and uncertainties in tropical forests and evergreen and deciduous forests.
机译:亚洲季风森林发生了广泛的变化,极大地影响了气候,碳循环和生物多样性。需要精确的空间分辨率的准确森林覆盖图,以限定和量化这些影响。在这项研究中,开发了一种算法来绘制2010年的森林图,利用高级土地观测系统(ALOS)相控阵L波段合成孔径雷达(PALSAR)镶嵌数据集的结构和生物量信息以及MODerate的物候信息分辨率成像光谱辐射仪(MOD13Q1和MOD09A1)产品。我们的森林地图(PALSARMOD50 m F / NF)是通过从高空间分辨率图像中随机选择的地面真实样本进行评估的,总体准确度为95%。据估计,2010年亚洲季风森林总面积约为6.3×10 6 km 2 。常绿和落叶林的分布与冬季的中位数标准化差异植被指数(NDVI)相当吻合。 PALSARMOD50μmF / NF地图与日本航空航天局(JAXA F / NF),欧洲航天局(ESA F / NF),波士顿大学(MCD12Q1 F / NF),食品,森林等国家和地区制作的部分森林图显示出良好的空间和区域协议,农业组织(FAO FRA)和马里兰大学(Landsat森林),但热带森林以及常绿和落叶林的差异和不确定性相对较大。

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