基于VPB和osgGIS的流域三维虚拟环境建模方法

三维虚拟环境建模是实现流域虚拟仿真模拟的基础工作,快速智能地生成三维地形地物则是流域建模的关键技术。结合松花江流域地形建模和哈尔滨市建筑物建模,基于VirtualPlanetBuilder（VPB）和osgGIS进行了地形地物建模方法研究。阐述了基于地形DEM和遥感影像的流域多层次地形建模技术,探讨了多源数据的组织与利用方法。分别研究了线状地物和面状地物的参数设置方法,包括线状地物随地形起伏的设置、建筑物高度及顶面与侧面纹理的设置等。基于VPB和osgGIS的建模方法可以支持不同格式、不同精度和坐标系的原始数据,建模自动化程度高,生成的模型支持多层细节和基于外存的调度模式,可以为海量模型的实时调度渲染提供模型支持,是流域仿真模拟中三维地形地物的快速生成方案。

A 3D watershed virtual environment modeling method based on softwares VPB and osgGIS

3D virtual environment modeling is fundamental to watershed virtual simulation and how to generate 3D terrain and buildings swiftly and intelligently is the key technique.In this work,the modeling method was studied in the frame of softwares VirtualPlanetBuilder(VPB) and osgGIS through terrain modeling for Songhua River and buildings modeling for Haerbin city.This paper proposes a detailed procedure of organizing DEM data and remote sensing images to build multilevel terrain and discusses a method for multisource data’s organization and utilization,including modeling techniques for elevation of wirelike objects,height of buildings and top and side textures of buildings,etc.The adopted frame supports source data in different formats,with different precisions and in different coordinate systems,and its model generation is swift and automatic.The models generated by this method support attributes of level-of-detail and out-of-core control and can be used to realize real-time rendering of massive data easily.