中国西南山区GEOV1、GLASS和MODIS LAI产品的对比分析
Intercomparison Among GEOV1,GLASS and MODIS LAI Products over Mountainous Area in Southwestern China
查看参考文献31篇
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文摘
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叶面积指数(Leaf Area Index,LAI)是表征植被生物物理变化和冠层结构特征的关键参数,目前存在多个全球范围、长时间序列LAI产品,对其进行验证是LAI产品应用的重要前提,然而目前山区的验证工作尤其少见。在我国西南山区选取6个典型样区,考虑山区复杂地形特征,从产品时空完整性以及对山区植被时空特征表征能力等方面对GEOV1、GLASS和MODIS LAI产品进行对比分析。研究结果表明:①相比于地形平坦地区,在山区随海拔和地形起伏度的增加,LAI产品时空完整性呈递减的趋势,其中,GEOV1LAI表现最差,MODIS LAI次之,GLASS LAI表现最好;②GLASS LAI和GEOV1LAI的空间分布合理且具有较好的一致性,MODIS LAI的空间分布和二者存在差异,3种LAI产品均难以准确反映山区植被垂直带谱的变化特征;③草地类型LAI产品间差值较小,林地和农作物GLASS LAI和GEOV1LAI产品一致性较好,MODIS LAI产品和二者存在较大的差异;④GLASS LAI时间序列曲线平滑且连续,GEOV1LAI存在时间不连续现象,MODIS LAI季相变化中的波动现象比较严重;各产品不仅难以准确反映冬季的常绿针叶林LAI,而且难以准确表征样区内农田作物轮作的物候信息。对比分析有助于发现LAI产品在山区存在的问题,并为今后LAI产品的算法改进提供帮助和参考。 |
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其他语种文摘
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Leaf Area Index(LAI)is a key biophysical variable for describing the canopy architecture.Currently,several global scale and long term LAI data sets have been produced.Validation of the LAI products is critical for their proper use in land surface models.However,existing studies were limited over flat terrain,the performance of the LAI data sets in mountainous area is still unknown.To fill this gap,the GEOV1,GLASS and MODIS LAI products were indirectly validated over mountainous area,southwestern China.The validation was conducted through the evaluation of the spatio-temporal continuity and the capability to capture phonological characteristics.The results indicate that LAI products shows worse spatio-temporal continuity in mountainous area than that in flat area.The best continuity is achieved by GLASS in our study areas and the worst is from GEOV1.GEOV1 and GLASS LAI product shows good spatial consistency,but MODIS is different from them.All products can hardly capture the details of the altitudinal distribution of biome types.The difference between the three products can be neglected over grassland but obvious over forests and cropland.GLASS LAI time series are smooth and continuous.GEOV1LAI time series have lots of gaps and MODIS LAI time series are very shaky.All three LAI products display unreasonable seasonality for evergreen needleleaf forests and crops.This study may facilitate the improvement of the quality of LAI product over mountainous areas. |
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来源
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遥感技术与应用
,2016,31(3):438-450 【核心库】
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DOI
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10.11873/j.issn.1004-0323.2016.3.0438
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关键词
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叶面积指数产品
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山区
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时空特征
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交叉验证
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地址
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中国科学院水利部成都山地灾害与环境研究所, 四川, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1004-0323 |
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学科
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自动化技术、计算机技术 |
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基金
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国家自然科学基金项目
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中国科学院国际合作局对外合作重点项目
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中国科学院创新团队国际合作伙伴计划
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文献收藏号
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CSCD:5745989
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