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Empirical method for topographic correction in aerial photographs

机译:航空照片地形校正的经验方法

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摘要

We suggest an empirical method to correct topographic effects on vegetation classification of panchromatic aerial photographs. The method is based on the use of spatial interpolation technique that constructs a luminance surface from targets of high brightness values. The luminance surface is then used to correct the topographic effects differentially, by increasing brightness values in shaded areas and decreasing brightness values of lightened areas. For this purpose, the use of a trapezoidal function was found successful in the reduction of standard deviation of brightness values of trees, shrubs, and herbaceous plants after empirical correction. This method outperformed a frequently used digital elevation model-based topographic correction in terms of overall classification accuracy of the resulting images.
机译:我们建议一种经验方法来纠正地形对全色航空照片的植被分类的影响。该方法基于空间插值技术的使用,该技术从高亮度值的目标构建亮度表面。然后,通过增加阴影区域的亮度值并减小亮区的亮度值,使用亮度表面来差异地校正地形效果。为此,在经验校正后,使用梯形函数已成功降低了树木,灌木和草本植物的亮度值的标准偏差。就所得图像的整体分类精度而言,此方法优于经常使用的基于数字高程模型的地形校正。

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