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采用传统的基于线性高程晕渲方法重建的三维路面,对于较平整的路段,显示的路面效果比较夸张,而对于路面质量较差的路段,在显示坑槽的同时,又会忽略路段的平整特性。提出一种基于对数映射的三维路面高程晕渲方法,首先以路面平均高度值为基准将测得的路面相对高程归一化,再将归一化后的高程进行对数映射,最后将变换后的数据线性等分成20个晕渲色层。在-10~+10mm的相对高程范围内对应于10个色层,表征路面的平整特性,-10~-100mm和+10~+100mm的相对高程对应于另外10个色层,用于表征路面的变形类病害。研究结果表明:运用这种方法不仅能够实现对路面质量较差、路面有较大坑槽和拥包的三维路面的彩色晕渲,同时还能表现路面的破损信息、局部平整度及车辙信息,增强了显示效果。
The traditional three-dimensional road surface reconstructed based on the linear elevation shading method is more exaggerated for the more flat road sections, while for the road sections with poor road quality, the flat sections of the road sections are ignored while the pit sections are displayed . A three-dimensional road surface height shading method based on logarithm mapping is proposed. First, the measured relative height of the pavement is normalized based on the average pavement height. Then the normalized elevation is logarithmically mapped. Finally, The data is linearly divided into 20 halo layers. Corresponds to 10 color layers in a relative elevation range of -10 to +10 mm to characterize the flatness of the road surface and relative elevations of -10 to -100 mm and +10 to +100 mm correspond to the other 10 color layers for characterization of the road surface Deformity disease. The results show that this method can not only realize the color shading of poor pavement quality, large pit on the pavement and embracing three-dimensional pavement, but also show the damage information, local flatness and rutting information of the pavement, Enhance the display.