| The earth has undergone a long period of evolution and development,forming a complex and diverse geological landscape.Geological landscape is an important object and carrier of geoscience research,which not only has the value of scientific research,but also has the value of aesthetic education.Therefore,for a long time,geologists have recorded geological landscape phenomena by various means,including field sketch,photography,video and so on.However,geological landscape itself is a complex three-dimensional real scene,with the characteristics of diversity,multi-scale and irregularity.It is difficult for the traditional recording method to truly invert the three-dimensional geological real scene.Geographers need a simple,fast and accurate way to record the geological landscape in the field.With the fusion development of computer vision,photogrammetry and remote sensing technology,Structure From Motion Multi View Stereo(sfm-mvs)3D reconstruction technology has emerged.This technology is a 3D reconstruction technology based on images,which USES the images collected From multiple perspectives to realize the rapid and true reconstruction of 3D space.Compared with the expensive laser scanning radar,SFM technology can realize 3D reconstruction of objects only by using digital images,and the collection of digital images can be completed by using common digital cameras or smart phones,which greatly reduces the cost of 3D data collection.In addition,this technique has the advantages of simple operation and high precision of modeling,which is the latest progress in photogrammetry field and the hot spot of remote sensing research.At present,the 3d reconstruction of geological landscape using SFM technology is still in the exploration stage,and few domestic scholars have carried out research on it.Based on SFM technology,this paper conducts research on the following six aspects of 3d reconstruction of geological landscape :(1)from the perspective of imaging mechanism,the 3d reconstruction principle of SFM is summarized,and the relevant algorithm is further studied;(2)from the perspective of geoscience application,the modeling process of SFM technology in the field geological environment was studied;(3)studied the key problems faced by SFM technology in practical application,including remote sensing platform,camera sensor and processing software;(4)the 3d point cloud obtained by SFM technology was compared with the ground laser lidar point cloud,and the accuracy of the point cloud was evaluated.(5)taking engineering geological mapping as an example,the application of SFM technology in engineering geological mapping is expounded.(6)the 3d reconstruction technology based on Web3 D is studied,and the application prospect of SFM technology in geoscience is forecasted.Based on SFM 3d reconstruction technology,this paper has obtained research results in four aspects :(1)taking the typical geological profile of zhoukoudian as an example,a set of rapid 3d reconstruction scheme is studied,which is suitable for field geological scenes without scale constraints.(2)taking the taiping mountain landslide in zhoukoudian and the cliff in Enshi,Hu Bei province as examples,the high-precision 3d reconstruction technology of SFM was studied,which solved the problem that it was difficult to observe the high and steep slope in close distance by traditional geological mapping.(3)the dense point cloud obtained by SFM is compared with lidar,and the experimental results show that the spatial location distance of the two points cloud has a high consistency.(4)for 3d reconstruction of geological landscape,a set of cloud 3d reconstruction system is developed on the basis of Web3 d technology,which can conduct rapid 3d reconstruction of images and generate digital elevation model and orthophoto image at the same time.It has been deployed in aliyun platform to meet the needs of real-time 3d reconstruction of field geological data acquisition and synchronous data transmission. |
