Abstract-Terrestrial laser Scanning (TLS) intensity data are influenced by many factors. In this paper, the influence of target surface properties on TLS intensity data is considered. Experiments were carried out with standard reflector, some different color plates and selected building facades of various kind of material. Through the research on the intensity quality, we can conclude that the target reflectance characteristics at the laser wavelength determine its intensity value. Two correlations, that is, intensity value and range accuracy, intensity value and its standard deviation are not the same for different targets. Color has a great impact on the intensity of scanned point data. The white, yellow, cyan and green plates have large intensity with a better reflectivity at green laser, while red and black have small intensity with worse reflectivity.
Abstract-Aiming at the condition that each point in point clouds has different positional accuracy, a new method for fitting plane to point clouds is proposed. The method is based on weighted total least squares (WTLS). According to the effect of intensity of each point on positional accuracy and the structure of coefficient matrix, the weight matrix was defined. In order to verify the applicability of the proposed method, analytical experiments based on instant data of different materials were done, and comparisons between the method and traditional methods, such as least squares (LS) method and total least squares (TLS) method were implemented. The results show that the method is suitable for fitting plane to point clouds with good homogeneity, and more accurate parameters solution can be obtained as compared with TLS and LS. As for point clouds with poor homogeneity, the proposed method is unsuitable for the same operational use, while TLS is the most effective method.
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