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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.

The expressway facilities management system is becoming crucial for successful traffic management with the spreading of expressway construction in China. In this paper, the current expressway facilities management systems are analyzed. Due to lack of the spatiotemporal data management capability of these systems, a bi-temporal spatial data model is proposed, which combines the temporal relational data structure with the spatial data model. In considering the characteristics of expressway facilities management, the corresponding data structure and data manipulation steps are formulated. Hopefully the research would make a useful exploration for the expressway facilities management transformation from threedimension to spatiotemporal four-dimension.