The minimum confidence limit for diameters in crater counts
The minimum confidence limit for diameters in crater counts
复制标题
火山口计数直径的最小置信限
DOI:
10.1016/j.icarus.2020.113645
复制
发表时间:
2020-05
期刊:
影响因子:
3.2
通讯作者:
Cui Jun
中科院分区:
文献类型:
--
作者:
Wang Yichen;Xie Minggang;Xiao Zhiyong;Cui Jun
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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