Mapping tropical forests and rubber plantations in complex landscapes by integrating PALSAR and MODIS imagery
文献类型: 外文期刊
作者: Dong, Jinwei 1 ; Xiao, Xiangming 1 ; Sheldon, Sage 1 ; Biradar, Chandrashekhar 1 ; Xie, Guishui 2 ;
作者机构: 1.Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USA
2.Chinese Acad Trop Agr Sci, Rubber Res Inst, Danzhou 571737, Hainan, Peoples R China
关键词: PALSAR;MODIS;evergreen forest;deciduous forest;rubber plantation;hainan
期刊名称:ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING ( 影响因子:8.979; 五年影响因子:9.948 )
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收录情况: SCI
摘要: Knowledge of the spatial distribution of forest types in tropical regions is important for implementation of Reducing Emissions from Deforestation and Forest Degradation (REDD), better understanding of the global carbon cycle, and optimal forest management. Frequent cloud cover in moist tropical regions poses challenges for using optical images to map and monitor forests. Recently, Japan Aerospace Exploration Agency (JAXA) released a 50 m orthorectified mosaic product from the Phased Array Type L-band Synthetic Aperture Radar (PALSAR) onboard the Advanced Land Observing Satellite (ALOS). PALSAR data provides information about the land surface without cloud interference. In this study we use the fine beam dual (FBD) polarization PALSAR 50 m mosaic imagery and a Neural Network (NN) method to produce a land cover map in Hainan Island, China. Subsequently, forest areas are classified into evergreen and deciduous forests and rubber plantations are mapped using vegetation and land surface water indices derived from 250 to 500 m resolution MODIS products. The PALSAR 50 m forest cover map, MODIS-based forest types and rubber plantation maps are fused to generate fractional maps of evergreen forest, deciduous forest and rubber plantation within 500 m or 250 m pixels. PALSAR data perform well for land cover classification (overall accuracy = 89% and Kappa Coefficient = 0.79) and forest identification (both the Producer's Accuracy and User's Accuracy are higher than 92%). The resulting land cover maps of forest, cropland, water and urban lands are consistent with the National Land Cover Dataset of China in 2005 (NLCD-2005). Validation from ground truth samples indicates that the resultant rubber plantation map is highly accurate (the overall accuracy = 85%). Overall, this study provides insight on the potential of integrating cloud-free 50 m PALSAR and temporal MODIS data on mapping forest types and rubber plantations in moist tropical regions.
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