一种三维灾场环境地表影像快速更新的方法  

Rapid Updating Method of Local Texture in 3D Terrain Scene

作　　者：宁方馨[1,2] 王艳慧[1,2] 刘浩[1,2] 

机构地区：[1]首都师范大学资源环境与旅游学院,北京100048 [2]北京市城市环境过程与数字模拟重点实验室,北京100048

出　　处：《地理空间信息》2013年第6期87-89,10-11,共3页Geospatial Information

基　　金：国家自然科学基金资助项目(41001300);十二五国家科技支撑计划资助项目(2012BAH33B03)

摘　　要：针对三维灾场环境地表影像动态更新的需求,提出了一种基于实拍照片的地表影像快速更新方法。首先利用相机的内部参数和拍照时记录的方位和朝向等参数,在三维空间中构建一个虚拟的相机视锥体模拟相机拍照时的姿态,与地面求交得到相机的取景范围;然后利用多重纹理混合法将照片叠加于地形表面,从而实现灾区影像的快速更新。实验表明,该方法实现的地表影像更新匹配效果较好,高清照片不仅提供了更多精细的地表信息,还克服了遥感影像所存在的数据获取难、周期长、传输量大等缺陷,简化了影像更新的工作流程,提高了时效性,能够满足实际应用的需要。To meet the dynamic texture updating of 3D terrain scene,this paper introduced a method to update local texture of 3D terrain scene using photographic images.First,a camera view frustum was constructed in 3D scene to simulate the posture of the camera in photographing based on the internal parameter and posture parameter of the camera,then calculated the intersection between view frustum and the terrain and got the geographical scope of the photographic image.Finally,it used the multi texture blending method to overlay the photographic image on the original texture.The experimental results show that this method can acquire a good matching result,and provides high quality surface information and meets the practical application.Furthermore,this method compensates the defect of remote sense images such as diicult to obtain,long period and large amount data.

关 键 词：三维灾场环境 影像更新 实拍照片 多重纹理混合 

分 类 号：P237.3[天文地球—摄影测量与遥感]