Taken the poyang lake region as test site , we firstly build the lod models ( including terrain and culture feature data ) based on viewpoint . secondly , we adopt active surface definition , a real - time framework , to manage the terrain data , and then apply clip texture to efficiently manage the high - resolution textures . thirdly , the parallel processing technology is used to deploy the scene database dynamically and optimize real - time simulation graphics , which result in higher fidelity and better simulation effects in the virtual scene we finally built up 首先建立基于视点的lod模型(包括地形和地物) ，然后采用活动表面定义( activesurfacedefinition )这一实时架构来管理地形数据的调度，并结合剪切纹理( cliptexture )技术对高分辨率纹理数据进行有效的管理，以及利用并行处理技术对场景数据库进行动态调度管理和实时仿真图形优化处理，从而建立真实感强、仿真效果佳的大规模虚拟场景，有效地解决了这一问题。
In the end , one original design method of monitoring program for multi - dsp program - controlled instrument is presented in virtue of petri net and boolean matrix . chapter 1 gives a comprehensive description about the significance of research and the current research status of real - time dsp , parallel processing and vxi virtual instrument technology 第一章综述部分提出了选题的意义，介绍了实时数字信号处理技术、并行处理技术和vxi虚拟仪器的概念与发展现状，课题提出的背景与主要的研究方向。
