By means of 3 d laser scanning technology has rapidity, non-contact, high density, high precision features, such as the mining subsidence area on the station point cloud data registration, denoising, model building, such as pretreatment, can get real and effective information and visualization expression results subsidence area. The research results show that the 3 d laser scanning technology is applied to the mining subsidence area, to build accurate model of subsidence area, meet the requirements of subsidence analysis, has engineering practical value. Currently, as pillar energy, coal is mined on a big scale. However, mining brings a lot of environmental and geological problems to diggings, such as subsidence, building damage and harmful substances into the ground water([1]). Traditionally, levelling instrument and total station are used to monitor the subsidence in diggings. With the development of surveying technology, many new techniques are also applied. Sheng Yehua et al. acquired digital image pairs of subsidence area by high resolution digital camera, built DTL algorithmic model on the basis of image control points set on site, and calculated a series of 3D coordinates which can describe the morphological characters of subsidence area. Under the support of GIS, DTM of initial terrain and status of subsidence area were built. Through the analysis of two-stage DTM, specific morphological characteristic parameters of subsidence area were calculated([6]). Shi Xianling, Guo Hongxing et al. set up monitoring network and measured spatial coordinates of stations by GPS-RTK and GPS quasi dynamic measuring. After solving and analyzing the data, they found an law of surface movement with good effect([2-4]). With the help of 3D laser scanning technology, we can effectively get dense point cloud data and large-scale subsidence information. The biggest advantage of this technology is that 3D laser scanning can acquire high-precision point cloud data directly without prism. Under the advantage of fast acquisition of high-precision 3D information, 3D laser scanning technology can collect a large number of dense point cloud data of subsidence area in a short time. And it can build DTMof complex and anomalous scence quickly, response the true appearance of subsidence basin. Moreover, this is the basis of calculating estimated parameters and analyzing ground movement. Compared with artificial measurement, 3D laser scanning technology is competitive and has more broader development space.
