2results about How to "Guaranteed modeling accuracy" patented technology

The invention relates to a method for generating a verification model through any-order ray tracing. The method comprises the following steps: inputting and determining an incident point coordinate, an N-order reflection point coordinate and an emergent point coordinate after ray escape after the latest reflection; calculating an incident direction and a reflection direction of the ith reflection, and calculating a normal vector on a reflection point of the ith reflection; establishing a reflection local coordinate system of i-th reflection by taking the reflection point as an original point; and generating a model or a grid of the reflection system according to the reflection local coordinate system. According to the method, the accuracy of a ray tracing verification model is remarkably improved, the method can be adapted to any ray reflection scene of a positive integer order, and a high-fidelity model support is provided for design of various complex optical reflection systems and ray tracing simulation.

The application provides a three-dimensional model construction method and system for topographic survey, and belongs to the technical field of model construction. The method comprises the following steps: segmenting satellite images of a target survey area based on the complexity of the terrain to obtain complex terrain areas and open terrain areas; obtaining laser scanning data of the complex terrain areas and low-altitude image data of the open terrain areas; fusing the laser scanning data and the low-altitude image data to obtain a target data set corresponding to the target survey area; constructing a regular grid model corresponding to the target survey area based on the target data set; constructing an irregular triangular grid model corresponding to the target survey area based on the laser scanning data; and fusing the regular grid model and the irregular triangular grid model to obtain a three-dimensional model of the target survey area. The three-dimensional model construction method and system for topographic survey can improve the modeling accuracy.