• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied optics >ANALYSIS OF THE INFLUENCE OF O-2 A-BAND ABSORPTION ON ATMOSPHERIC CORRECTION OF OCEAN-COLOR IMAGERY
【24h】

ANALYSIS OF THE INFLUENCE OF O-2 A-BAND ABSORPTION ON ATMOSPHERIC CORRECTION OF OCEAN-COLOR IMAGERY

机译：O-2 A波段吸收对海洋色彩图像大气校正的影响分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Two satellite-borne ocean-color sensors scheduled for launch in the mid 1990's each have a spectral band (nominally 745-785 nm) that completely encompasses the O-2 A band at 762 nm. These spectral bands are to be used in atmospheric correction of the color imagery by assessment of the aerosol contribution to the total radiance at the sensor. The effect of the O-2 band on the radiance measured at the satellite is studied with a line-by-line backward Monte Carlo radiative transfer code. As expected, if the O-2 absorption is ignored, unacceptably large errors in the atmospheric correction result. The effects of the absorption depend on the vertical profile of the aerosol. By assuming an aerosol profile-the base profile-we show that it is possible to remove most of the O-2-absorption effects from atmospheric correction in a simple manner. We also investigate the sensitivity of the results to the details of the assumed base profile and find that, with the exception of situations in which there are significant quantities of aerosol in the stratosphere, e.g., following volcanic eruptions or in the presence of thin cirrus clouds, the quality of the atmospheric correction depends only weakly on the base profile. Situations with high concentrations of stratospheric aerosol require additional information regarding vertical structure for this spectral band to be used in atmospheric correction; however, it should be possible to infer the presence of such aerosol by a failure of the atmospheric correction to produce acceptable water-leaving radiance in the red. An important feature of our method for removal of the O-2-absorption effects is that it permits the use of lookup tables that can be prepared in the absence of O-2 absorption by the use of more efficient radiative transfer codes. [References: 25]
机译：计划在1990年代中期发射的两个卫星海洋色传感器每个都有一个光谱带（标称745-785 nm），完全覆盖762 nm的O-2 A波段。通过评估气溶胶对传感器总辐射的贡献，这些光谱带将用于彩色图像的大气校正。使用逐行反向蒙特卡洛辐射传输码研究了O-2频段对卫星测量的辐射的影响。不出所料，如果忽略O-2吸收，则大气校正结果中的误差会大到无法接受的程度。吸收效果取决于气溶胶的垂直剖面。通过假设气溶胶廓线（基本廓线），我们表明可以以简单的方式消除大气校正中的大多数O-2-吸收效应。我们还研究了结果对假定的基本剖面细节的敏感性，发现除了平流层中存在大量气溶胶的情况（例如火山喷发或薄卷云的存在） ，大气校正的质量仅在很小程度上取决于基本轮廓。平流层气溶胶浓度高的情况需要有关该光谱带的垂直结构的其他信息，以用于大气校正;但是，应该有可能通过大气校正的失败而推断出这种气溶胶的存在，从而产生红色的可接受的留水辐射率。我们消除O-2-吸收效应的方法的一个重要特征是，它允许使用查找表，该查找表可以在不存在O-2吸收的情况下通过使用更有效的辐射转移码来制备。 [参考：25]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号