arXiv 2003.006322020-03-02astro-ph.IMastro-ph.EP

火星上下文相机图像的经验光度控制

Empirical Photometric Control of Mars Context Camera Images

Stuart J. Robbins, Michelle R. Kirchoff, Rachael H. Hoover

备注：: 23 pages, 5 figures

摘要：

火星勘测轨道飞行器（MRO）自2006年3月以来一直在火星轨道上运行。MRO上的环境相机（CTX）已经以每像素约5-6米的速度返回了超过10万张地球图像，几乎覆盖了全球。在这段时间里，火星经历了近7个自己的年，太阳距离从1.38到1.67 AU变化，由于轨道偏心率，相应的太阳通量增加了45%。季节效应和瞬变现象影响大气透明度。与老化检测器相结合，CTX图像很难无缝拼接，因为所有这些变化都阻止了均衡图像以创建视觉上平滑的照明产品。我们已经开发出一种方法，基于其他研究人员以前对其他数据集的工作，以减轻图像之间几乎所有的光度变化，以创建均匀照明的外观，几乎无缝的马赛克。我们描述了这个过程是如何工作的，它使用一个参考源来连接亮度值，并展示了它在火星表面的影响。虽然为该产品开发的工作流程适用于其他行星机构，但它需要一个参考源，而这可能还不存在。

英文摘要：

The Mars Reconnaissance Orbiter (MRO) spacecraft has been in orbit around Mars since March 2006. The Context Camera (CTX) on MRO has returned over 100,000 images of the planet at approximately 5-6 meters per pixel, providing nearly global coverage. During that time, Mars has gone through nearly 7 of its own years, changing solar distance from 1.38 to 1.67 AU and the corresponding solar flux by 45% due to its orbital eccentricity. Seasonal effects and transient phenomena affect atmospheric transparency. Combined with an aging detector, CTX images are difficult to mosaic seamlessly, for all of these changes prevent equalizing images to create a visually smoothly illuminated product. We have developed a method, based on previous work by other researchers for other datasets, to mitigate almost all photometric variations between images in order to create the appearance of an evenly illuminated, practically seamless mosaic. We describe how the process works, which uses a reference source to tie brightness values, and demonstrate its effects across Mars' surface. While the workflow developed for this product is applicable to other planetary bodies, it requires a reference source, which may not yet exist.

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