The minimum confidence limit for diameters in crater counts

The minimum confidence limit for diameters in crater counts
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火山口计数直径的最小置信限

DOI:
10.1016/j.icarus.2020.113645
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发表时间:
2020-05
期刊:
影响因子:
3.2
通讯作者:
Cui Jun
Cui Jun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang Yichen;Xie Minggang;Xiao Zhiyong;Cui Jun

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陨石坑的尺寸-频率分布(即SFD)经常用于研究行星表面的相对和绝对模型年龄。人们普遍认为,陨石坑统计数据是不完整的,陨石坑识别在直径范围接近所用图像的几个像素时是不准确的,但没有关于直径最小置信限(Dmin)的基准。在这里,我们通过比较每个研究的陨石坑人口的SFD来解决这个问题,使用相同的图像数据集,通过不同的折叠进行下采样。利用不同的图像数据集对几个不同年龄的月球陨石坑种群进行系统研究发现,在直径大于10像素左右的基础图像上,陨石坑统计可以被认为是完整的,陨石坑边缘识别可以被认为是准确的。综合陨石坑计数的其他潜在困难(例如,照明条件,个人偏见,地形粗糙度,计数区域的大小)将表明,10个像素应该被视为保守的建议。使用10像素的像素可以大大提高陨石坑计数的可靠性,特别是对于使用小陨石坑种群的流行的高分辨率区域地质研究。
Size-frequency distribution (i.e., SFD) of impact craters are frequently used to study relative and absolute model ages for planetary surfaces. It is well accepted that crater statistics are incomplete and crater recognition is inaccurate at diameter ranges approaching a few pixels of the images used, but there is no benchmark about the minimum confidence limit for diameter (Dmin). Here we resolve this problem by comparing the SFD of each studied crater population using a same image dataset that has been down-sampled by different folds. A systematical study of several different-aged lunar crater populations using various image datasets found that crater statistics can be regarded as completed and crater rim identification can be regarded as accurate at diameters larger than about 10 pixels of the base images. Integrating other potential difficulties in crater counts (e.g., illumination conditions, personal biases, topography roughness, size of counting areas) would indicate that 10 pixels should be considered as a conservative suggestion. Using 10 pixels asDmincould substantially enhance the reliability of crater counts, especially for prevalent high-resolution regional geological studies that employ populations of small craters.
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