计算机应用 ›› 2014, Vol. 34 ›› Issue (9): 2683-2686.DOI: 10.11772/j.issn.1001-9081.2014.09.2683

• 虚拟现实与数字媒体 • 上一篇    下一篇

面向瓦片金字塔的层深确定与投影变换方法

李建勋1,郭莲丽1,李杨2,孙霄2   

  1. 1. 西安理工大学 经济与管理学院,西安 710048;
    2. 西安理工大学 水资源研究所,西安 710048
  • 收稿日期:2014-04-10 修回日期:2014-06-23 出版日期:2014-09-01 发布日期:2014-09-30
  • 通讯作者: 李建勋
  • 作者简介: 
    李建勋(1977-),男,陕西乾县人,副教授,博士,主要研究方向:决策支持系统、水利信息化;
    郭莲丽(1978-),女,陕西西安人,博士研究生,主要研究方向:管理科学与工程;
    李杨(1989-),男,陕西咸阳人,硕士研究生,主要研究方向:数字地球;
    孙霄(1989-),女,陕西西安人,硕士研究生,主要研究方向: 水利信息化。
  • 基金资助:

    “十二五”国家水体污染控制与治理重大专项;国家自然科学基金资助项目;陕西省自然科学基础研究计划项目

Layer depth determination and projection transformation method oriented to tile-pyramid

LI Jianxun1,GUO Lianli1,LI Yang2,SUN Xiao2   

  1. 1. College of Economics and Management, Xi'an University of Technology, Xi'an Shaanxi 710048, China
    2. Water Resources Research Institute, Xi'an University of Technology, Xi'an Shaanxi 710048, China
  • Received:2014-04-10 Revised:2014-06-23 Online:2014-09-01 Published:2014-09-30
  • Contact: LI Jianxun

摘要:

为了提高瓦片金字塔变换效率,结合数字地球的视域模型,建立一个15参数的四次多项式投影变换方法,从理论上探讨瓦片大小选择的影响因素,给出瓦片大小和瓦片金字塔层深的优化方法,并且采用JOGL构建一个基础数字地球环境BDE2对算法进行测试。分析与实验结果显示:该算法构建的像素精度为10m的瓦片金字塔层深仅为10,投影变换误差未超过5×10-5,且算法复杂度低、拼接紧密、清晰度高、失真小,能够有效地避免变换后影像的拼接裂缝和特征失真。

Abstract:

In order to improve the transformation efficiency of tile-pyramid image, a 15-parameter projection transformation method was established by quartic polynomial based on the view model of digital earth. The influencing factors for selecting the size of tile image were discussed theoretically, and an optimization method to determine the size and depth of tile-pyramid was given. To test this algorithm, a basic digital earth environment BDE2 was constructed by adopting JOGL. The analysis and experimental results show that tile-pyramid in 10m pixel accuracy constructed by this algorithm only has 10 layers and less than 5×10-5 average error; meanwhile, the proposed algrithm has low complexity, close stitching, high definition and low distortion, and can effectively avoid stitch cracks and characteristics distortion after the image is transformed.

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