辐射特征支持下的城市高分影像阴影校正
Radiance transfer process-based shadow correction method for urban regions in high spatial resolution image
- 2016年20卷第1期 页码:138-148
纸质出版日期: 2016
DOI: 10.11834/jrs.20165109
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纸质出版日期: 2016 ,
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[1]温兆飞,吴胜军,陈吉龙,吕明权,姜毅.辐射特征支持下的城市高分影像阴影校正[J].遥感学报,2016,20(01):138-148.
WEN Zhaofei, WU Shengjun, CHEN Jilong, et al. Radiance transfer process-based shadow correction method for urban regions in high spatial resolution image[J]. Journal of Remote Sensing, 2016,20(1):138-148.
大量城市建筑使得高分影像中含有许多阴影区。这些阴影区在土地利用分类、植被绿度调查等遥感应用中会较大地影响结果精度
降低数据使用效率并增加研究成本。基于同一地物阴影区与临近非阴影区反射率相等这一辐射特征关系
通过建立辐射传输方程
发展了一种新的城市高分遥感影像阴影校正方法 RERB(Reflectance Equality Relationship Based Method)。利用RERB对不同城市(北京和荷兰Enschede)不同高分多光谱影像(Geo Eye-1和Quick Bird)进行阴影校正
并对比分析其与被广泛采用的均值方差变换法MVT(Mean and Variance Transformation)的校正结果
通过定性和定量精度评价发现:(1)RERB能很好地将城市阴影区影像视觉特征(颜色、纹理、色调等)信息恢复到与非阴影区同一水平上;(2)RERB恢复后的阴影区具有丰富的细节信息且在视觉上与临近非阴影区具有良好的一致性;(3)RERB恢复后的城市柏油路面和水泥路面阴影区辐射信息具有较低的误差
可见光-近红外波段的平均误差分别为7%和9%。同时RERB能较好地恢复城市阴影区植被波谱特征信息。
The presence of urban shadows in optical satellite images with high spatial resolution limits the application of remote sensing technology in urban areas. These shadows can misrepresent image information
thereby generating potential errors in the derivation of surface parameters such as surface reflectance and reflectance-based indices. Thus
these shadows must be corrected and their radiance information restored to improve the effectiveness of remote sensing images. Many shadow correction methods have been developed according to the complex statistical relationships between shadowed and sunlit areas because the former maintains weak spectral radiance information. In addition
another physical relationship has often been detected between shadowed and sunlit areas
namely
the reflectance equality relationship( RER). This relationship can be regarded as the reflectance of the fact that similar-type features can be identical in both a shadowed area and its nearby sunlit area under the Lambertian surface condition.RER is generally independent of shadow detection processing; nonetheless
this relationship has not been fully considered in the development of shadow restoration algorithms. In this study
an RER-based( RERB) method were derived to correct the shadowed areas in optical multispectral satellite imageries of urban areas according to the principles of radiance transfer processes. This approach reduces the number of parameters; thus
it can lower the risk of errors propagated by the uncertainties of additional parameters. The new RERB method is tested via Geo Eye-1 and Quick Bird multispectral imageries with high spatial resolution in two different urban areas( Beijing and Enschede) that exhibit many urban building shadows. As per a comparison of this method with the widely used mean and variance transformation method
the former can restore the colors
texture
tone
and brightness of the shadowed areas in the image to a visually satisfactory level. Quantitative analysis results suggest that the RERB method can help restore the reflectance of shadowed asphalt roads accurately
with a mean error of 7%. This method can also be used to effectively restore the spectral shape information on shadowed features; this information is particularly important when the RERB method is applied to restore multispectral imagery for classifying an image based on spectral information and band indices. Another RERB shadow correction strategy that restores shadow surface reflectance instead of apparent radiance is discussed as well; nonetheless
this strategy requires further study because much auxiliary data is needed.
辐射传输阴影去除阴影恢复建筑阴影大气校正辐射恢复光谱特征
radiance processingshadow removalshadow restorationbuilding shadowatmospheric correctionradiance restorationspectral features
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