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基于光谱特征分析的城市建设用地信息提取 被引量:2
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作者 樊舒迪 刘振华 胡月明 《数字通信世界》 2019年第10期5-9,共5页
以广州市为例,基于Landsat8 OLI 影像光谱特征分析和归一化指数构建,研究快速、准确地提取城市建设用地信息的原理以及方法。对研究区进行目视解译和光谱分析,并选取合适的归一化指数SAVI(Soil Adjusted Vegetation Index)、NDBI(Normal... 以广州市为例,基于Landsat8 OLI 影像光谱特征分析和归一化指数构建,研究快速、准确地提取城市建设用地信息的原理以及方法。对研究区进行目视解译和光谱分析,并选取合适的归一化指数SAVI(Soil Adjusted Vegetation Index)、NDBI(NormalizedBuilt-up Index)、MNDWI(Modified Normalized Difference Water Index)用于区分研究区简化分类的地物(植被、水体和建筑物),通过NDBI 与NDVI(Normalized Difference Vegetation Index)的差值进行波段组合,并用基于栅格的逻辑计算提取稀疏植被背景下的建筑物信息。在抽取的样本中,建筑物信息分类的用户精度为90.32%,非建筑信息分类的用户精度为86.36%,实验的总体精度为89.29%。研究结果表明,归一化指数的波谱间差异分析和逻辑判断的栅格计算,可以简化光谱分析过程,并快速、准确地获取建筑物信息,为土地科学的后需研究提供有效的数据支撑和城市信息分析结果。 展开更多
关键词 城市遥感 光谱分析 城市信息提取 归一化指数 NDBI
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粗糙裂隙煤岩的分形多场渗流模型及数值模拟
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作者 季明 孙中光 +3 位作者 刘冠男 范书帝 高峰 王春光 《采矿与安全工程学报》 EI CSCD 北大核心 2024年第5期1036-1045,共10页
煤体裂隙分布特性对气体聚集、运移及产出具有至关重要的影响。基于多孔介质分形理论,构建了一种新的跨学科分析模型,定量表征了煤岩裂隙粗糙程度,并将煤岩渗透率定义为它的函数,进而与煤体变形、吸附效应及气体压力耦合,实现了多物理... 煤体裂隙分布特性对气体聚集、运移及产出具有至关重要的影响。基于多孔介质分形理论,构建了一种新的跨学科分析模型,定量表征了煤岩裂隙粗糙程度,并将煤岩渗透率定义为它的函数,进而与煤体变形、吸附效应及气体压力耦合,实现了多物理场耦合作用下裂隙粗糙程度及分形行为对气体渗流、煤岩应力和渗透率影响的定量分析。研究表明:提出的4个分形参数能够很好地表征粗糙裂隙数目、长度、迂曲度及粗糙程度;当煤岩物性参数保持不变时,渗透率与裂隙迂曲度分形维数成反比,与裂隙分形维数成正比;相较于其他微观参数,迂曲度分形维数的改变对煤岩渗透率及气体压力的影响最大。研究结果可为相关工程项目提供一种全新的评估抽采率及开采安全性的跨学科方法。 展开更多
关键词 裂隙结构 分形几何 粗糙程度 多场耦合 渗透率
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Generating high spatiotemporal resolution LAI based on MODIS/GF-1 data and combined Kriging-Cressman interpolation 被引量:6
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作者 Liu Zhenhua Huang Rugen +2 位作者 Hu Yueming fan shudi Feng Peihua 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2016年第5期120-131,共12页
Generation of high spatial and temporal resolution LAI(leaf area index)products is challenging because higher spatial resolution remotely sensed data usually have coarse temporal resolutions and vice versa.In this stu... Generation of high spatial and temporal resolution LAI(leaf area index)products is challenging because higher spatial resolution remotely sensed data usually have coarse temporal resolutions and vice versa.In this study,a novel method that combining Kriging interpolation and Cressman interpolation was proposed to generate high spatial and temporal resolution LAI products by fusing Moderate Resolution Imaging SpectroRadiometer(MODIS)characterized by coarse spatial resolution and high temporal resolution and Gaofen-1(GF-1)with fine spatial resolution and coarse temporal resolution.This method was applied to the Huangpu district of Guangzhou,Guangdong,China.The results showed that compared to field observation,the predicted values of LAI had an acceptable accuracy of 73.12%.Using Moran’s I index and Kolmogorov-Smirnov tests,it was found that the MODIS data were spatially auto-correlated and characterized by normal distributions.Scaling down the 1 km×1 km spatial resolution MODIS products to a spatial resolution of 30 m×30 m using point-Kriging resulted in a precision of 79.38%compared to the results at the same spatial resolution derived from an 8 m×8 m spatial resolution GF-1 image by scaling up using block-Kriging.Moreover,the regression models that accounts for the relationship between NDVI(Normalized Difference Vegetation Index)and LAI based on MODIS data obtained the determination coefficients ranging from 0.833 to 0.870.Finally,the data fusion and interpolation of MODIS and GF-1 data using Cressman method generated high spatial and temporal resolution LAI maps,which showed reasonably spatial and temporal variability.The results imply that the proposed method is a powerful tool to create high spatial and temporal resolution LAI products. 展开更多
关键词 data fusion MODIS GF-1 LAI spatiotemporal resolution spatial interpolation remote sensing
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