地形仿真中遥感影像的应用及处理技术

Application and Processing Technology of Remote Sensing Images in Terrain Simulation

在分析几种地球表面表示方法的优缺点的基础上,提出用遥感影像作为三维地形仿真中表面纹理图以提高真实感的思想;提出不同高度实体视景地形的仿真应采用多级精度仿真的方案,并分析了地形仿真精度与影像分辨率间的关系;详细叙述了该应用方案中影像数据处理的流程及方法,包括:数据准备、真彩波段组合、影像增强、几何校正、拼接镶嵌、投影变换及三维地形生成等。实践证明,合理的影像数据处理方法和步骤可减少工作量并保证影像处理的精度和效果,现势性好,真彩组合的遥感影像用作三维地形仿真的表面纹理图是提高仿真真实感的有效技术途径。

Based on analyzing the merits and demerits of several earth surface descriptions, a thought of applying remote sensing images as surface texture mapping in 3D terrain simulation is presented to strengthen its reality. A scheme of applying multi-level precision simulation according to varied altitude objects in the visual terrain simulation is provided, and the relationship between the terrain simulation precision and resolution of image is analyzed.Then the flow and the methods in this application scheme are recounted, including data preparation, real - color bands combination, image strengthening, geometry correcting, spelling and mosaicking, projection conversion and 3D terrain rendering. Practices prove that rational image processing methods and steps can reduce workload and ensure the image processing precision and the 3D terrain simulation effect. Applying remote sensing images with excellent present situation and real-color combination as surface texture in 3D terrain simulation is an effective technology for strengthening the reality of simulation.