| 一种地学要素场透视方位投影图的原理及应用 |
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| 引用本文： | 杨玮,王盘兴,何金海.一种地学要素场透视方位投影图的原理及应用[J].南京气象学院学报,2010,33(2):193-197. |
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| 作者姓名： | 杨玮 王盘兴 何金海 |
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| 作者单位： | 南京信息工程大学,大气科学学院,江苏,南京,210044 |
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| 基金项目： | 国家自然科学基金重点资助项目(40633018) |
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| 摘 要： | 给出了一种地学要素场透视方位投影图的原理,它是将地球球面上任意点O（称投影中心）正上方h高度处A点（称视点）看到的球冠区要素场透视投影在相应球缺的底面（即投影面）上。借助球面三角计算公式,导出了球冠区任意点q与其在投影面上投影点q′的坐标转换关系;给出了绘图步骤,利用MATLAB设计了绘图程序。实际绘图效果表明,所绘图形具有球面立体感和直观性,该透视方位投影图可广泛用于绘制地学要素场图像。
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| 关 键 词： | 地学要素场 透视方位投影图 数学原理 制图步骤 |
The Principle and Application of a Perspective Azimuthal Projection for Geonomy Element Fields |
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| YANG Wei,WANG Pan-xing,HE Jin-hai.The Principle and Application of a Perspective Azimuthal Projection for Geonomy Element Fields[J].Journal of Nanjing Institute of Meteorology,2010,33(2):193-197. |
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| Authors: | YANG Wei WANG Pan-xing HE Jin-hai |
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| Institution: | School of Atmospheric Sciences/a>;NUIST/a>;Nanjing 210044/a>;China |
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| Abstract: | This paper presents the principle of a perspective azimuthal projection for geonomy element fields,which is to project the element field of the spherical cap at the view point A（at the height of h over the projection center O on the Earth surface） onto the corresponding underside of the spherical segment.By using spherical trigonometry formulas,the coordinate transformation relationship between q and q′ is derived,where q is a point on the spherical cap and q′ is the projection point on the projection plane.Then,drawing procedures and MATLAB plotting programs are designed.The results show that the graphs are spherical three-dimensional and direct.Thus,this perspective azimuthal projection can be widely used in plotting graphs of geonomy element fields. |
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| Keywords: | geonomy element fields perspective azimuthal projection mathematical principle drawing procedures |
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