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In this paper, a method of slope surface model reconstruction based on smart phone is proposed for the problems of point layout limitation, expensive measuring equipment and easy operation of monitoring personnel. By explaining the principle and steps of the SfM-MVS algorithm, the slope surface model is reconstructed based on the slope image taken by smart phone. In this paper, the principle of partial reconstruction is described, which involves the principle of polar geometry and projection error, and the corresponding description of motion recovery structure algorithm and dense reconstruction algorithm steps. The concrete steps of slope 3D reconstruction are as follows: first, the mobile phone camera is calibrated by Zhang Zhengyou camera and the slope image is enhanced for subsequent processing. Finally, the SfM-MVS algorithm is used for sparse reconstruction and dense reconstruction to obtain point cloud data, and the slope surface model is reconstructed by triangulation and texture mapping. The slope surface model obtained by smartphone image lays the foundation of slope shape change monitoring and coordinate calculation, and has the characteristics of perfect slope overall information. The model reconstruction based on mobile terminal image acquisition can reduce the equipment cost of slope monitoring and the maneuverability of monitoring personnel, and has certain application value.

Rural development has always been one of the key and difficult problems in China, such as rural natural disaster monitoring, rural land resources and homestead management, rural cultural and tourism development, comprehensive management of rural environment and so on. In this paper, POS aerial triangulation technology is combined with rural areas, and the three-dimensional rural real scene is modeled and digitized, which brings a new idea to rural development and governance. In this paper, the consumer UAV is used to complete the rural low altitude aerial photography, and the rural 3D model reconstruction is completed based on the smart3d platform. The specific principle of POS assisted aerial triangulation is analyzed and the three-dimensional modeling process based on UAV aerial photography is displayed. Through experiments, it is verified that POS assisted aerial triangulation technology without ground control points can realize the 1:1 establishment of three-dimensional real scene model. The side length and height information can be read on the model, and the accuracy is high. At the same time, it puts forward the possibility and convenience of three-dimensional real scene model for house and land ownership registration. In the scene of site constraints and topographic conditions, POS assisted aerial triangulation without ground control points has the application value of emergency rescue, and has a certain practical significance for rural geological disaster monitoring.

In order to help solve the problem of the lag of information management in the old residential quarters of smart cities, this paper takes 42 old districts in a city as an example to collect housing data. Based on Baidu API, Java language programming, MySQL database and other modern information technology means, research and development meets The old city housing security information management mode of the smart city. Practice shows that the system integrates and utilizes the advantages of the Internet. From the perspective of WebGIS digital map display and integrated housing security management, it helps city managers to more easily input and query the monitoring and management of community houses, thus saving labor costs. Promote the scientific development of information management in old communities.