| 静止卫星标称投影解析方法及其在FY2-C中的应用 |
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| 引用本文： | 钱辉,师春香,施进明.静止卫星标称投影解析方法及其在FY2-C中的应用[J].遥感学报,2009,13(2):300-306. |
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| 作者姓名： | 钱辉 师春香 施进明 |
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| 作者单位： | 1. 中国地质科学院地质研究所大陆动力学实验室,北京,100037
2. 中国气象局国家卫星气象中心,北京,100081 |
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| 基金项目： | FY2-C地面应用系统数据处理DPC软件工程项目与FY-3卫星资料同化技术支撑平台及原型软件研发项目 |
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| 摘 要： | 通过对静止卫星在三轴椭球参数条件下地心坐标的标称投影公式推导过程,建立了经纬度到单位平面位置的可逆映射方程,其正反算公式精度可达10<'-20>;并对大地坐标的经纬度进行了类似的推导,但标识线垂直地表而不过地心的坐标定义导致正算公式中存在角度正切的四次方项,因此反算需要采用数值解法.两组解析表达式为查照表的建立提供了直接的数学依据,相对于迭代数值计算方法而言,解析方法更便于分析投影过程的误差和畸变.围绕FY2-C卫星地面系统工程中查照表的重建,兼顾卫星图像陆地位置与主要大陆轮廓数据的投影吻合,需要对单位平面的投影进行放大和平移,并提供多组可选择的放大因子,使得经纬度到图像点映射与查照表对应值整体误差较小.建议根据实际应用的坐标系统、卫星位置参数、地球参数选择不同的匹配参数.这种方法可以应用于图像点地理位置精度要求很高但计算不是特别频繁的数据处理算法中,如相对定标和定位,但在其他算法中除了精度以外查照表还是有作用的.
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| 关 键 词： | 标称投影 三轴椭球 经纬度查照表 静止卫星 正反算公式 |
Analytical method for geostationary satellite normalized projection and its FY2-C application |
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| QIAN Hui,SHI Chun-xiang and SHI Jin-ming.Analytical method for geostationary satellite normalized projection and its FY2-C application[J].Journal of Remote Sensing,2009,13(2):300-306. |
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| Authors: | QIAN Hui SHI Chun-xiang and SHI Jin-ming |
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| Abstract: | Presently the lookup table is adoptedwhen corresponding relation between the position of remote sensing images and the
geographic coordinates, which are involved in ground system engineering ofgeostationary satellites. For the corresponding geographic
coordinates of sub-pixelorcorresponding pointofnonstandard grid nodes, which are not in lookup table, bilinear interpolation have to
be introduced so that the precision loses remarkably for the image location. By deducing the formulas of geostationary satellite
normalized projection at the condition of three-axis ellipsoidalparameter, the reversible equation from longitude/latitude to position on
unitplane is established, which provides themathematical reliance for lookup table for satellite image engineering. And corresponding
match parameter forFY2-C application is provided after comparing with the practicing data of lookup table. The same procedure is
applied to the situation of geographic coordinate system, but the inverse problem needs numerical solutions. The inversemethod of
geocenter coordinate system may be used as approximationwhen ellipsoidalparameter is close to sphere, while notapplicable for fine
image processing. Thepossibility of the application inFY2-C engineering of this reversible formulas is also discussed, with the analysis
of the errordistribution comparedwith practicaldata and the selection ofapplicable parameters forbest fitting actualdata. |
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| Keywords: | FY2-C |
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