CAJ | 학술논문

本文介绍 EASE-Grid 3种投影的定义，利用地面实测数据和理论方式开展不同投影下 AMSR-E 雪水当量（SWE）产品的精度验证对比分析，研究其不同投影导致误差产生的原因。验证对比结果表明，青藏高原地区北半球方位角等积投影和全球圆柱体等积投影对于验证结果具有很大影响。理论分析结果表明，我国青藏高原地区在全球圆柱体等积投影下网格发生的形变较小，更适合采用全球圆柱体等积投影。进一步研究表明，AMSR-E亮温数据轨道采样点落入北半球方位角等积投影和全球圆柱体等积投影对应网格差异较大。雪水当量产品验证结果的误差包含了算法误差和投影带来的误差。在开展大尺度遥感反演时，应根据具体研究区所处的纬度范围及研究目的，选取适合的投影方式以降低投影引起的误差。
본문개소 EASE-Grid 3충투영적정의，이용지면실측수거화이론방식개전불동투영하 AMSR-E 설수당량（SWE）산품적정도험증대비분석，연구기불동투영도치오차산생적원인。험증대비결과표명，청장고원지구북반구방위각등적투영화전구원주체등적투영대우험증결과구유흔대영향。이론분석결과표명，아국청장고원지구재전구원주체등적투영하망격발생적형변교소，경괄합채용전구원주체등적투영。진일보연구표명，AMSR-E량온수거궤도채양점락입북반구방위각등적투영화전구원주체등적투영대응망격차이교대。설수당양산품험증결과적오차포함료산법오차화투영대래적오차。재개전대척도요감반연시，응근거구체연구구소처적위도범위급연구목적，선취괄합적투영방식이강저투영인기적오차。
In this paper,three EASE-Grids projection were described,in situ snow depth data and theoretical analysis were used to validate AMSR-E SWE product on different projects,and then the causes of error was analyzed.Verification results showed that validation results under northern hemisphere azimuth equal-area projection and global cylinder equal-area projection over the Tibetan plateau have a great influence.Theoretical analysis results showed that grid deformation is small over the Tibetan plateau in China under the global cylinder equal-area projection,and it is more suitable for global cylinder equal-area projection in this area.Further research shows that difference of AMSR-E bright temperature data samplings dropping into the northern hemisphere equal-area projection and global cylinder equal-area projection corresponding grids are very large. Validation error of SWE product contains algorithm error and projection error.When carrying out large scale remote sensing inversion,in order to reduce the error caused by projection,appropriate projection should be chosen in specific research area and for specific research purposes.