Martian crater ages and crater counting - Does the impact flux of small and large asteroids varied through time on Mars, the Earth and the Moon?

The SM_mars_crater_dating.xlsx table contains all the information used to date the 49 martian impact craters considered in this study (< 600 Ma). 

CRATER ID 

CRATER NAME

DIAM KM 

LAT 

LONG 

DEPTH RIM KM 

DEPTH SURF KM 

DEPTH FLOOR KM 

NUMBER LAYER

MORPHO EJECTA 

PRESERVATION 

COUNT AREA KM2: counting area from ejecta banket mapping 

COUNT AREA ASCI* KM2: counting area after removal of surfaces contaminated by secondary craters 

THRESHOLD AREA KM2: minimum size of Voronoi polygon area below which all associated detected craters are considered of secondary origin

NB SEC: number of secondary craters dentified by ASCI 

PERCENT SEC

NB CRAT 100M: total number of craters > 100 m detected by the CDA** on the CTX global mosaic*** over the counting area

NB PRIM 100M: number of craters identified as primaries by ASCI

TURNOFF DIAM KM: minimum crater diameter used to fit the crater-size frequency distribution (CSFD) with an isochron

NB CRAT FIT: number of craters used to fit the CSFD with an isochron

AGE GA: model age based on Hartmann (2005) chronology model**** and Michael et al. (2016) fitting technique*****

AGE MAX GA

AGE MIN GA

N(1): equivalent number of accumulated craters >1km per km2

N(1) MAX

N(1) MIN

*ASCI: Automatic Secondary Crater Identification: A. Lagain, K. Servis, G. K. Benedix, C. Norman, S. Anderson, P. A. Bland, Model Age Derivation of Large Martian Impact Craters, Using Automatic Crater Counting Methods, Earth and Space Science 8 (2) (2021). doi:10.1029/2020EA001598.

**CDA: Crater Detection Algorithm: G. K. Benedix, A. Lagain, K. Chai, S. Meka, S. Anderson, C. Norman, P. A. Bland, J. Paxman, M. C. Towner, T. Tan, Deriving Surface Ages on Mars Using Automated Crater Counting, Earth and Space Science 7 (3) (2020). doi:10.1029/2019EA001005.

*** CTX global mosaic: Context Camera global mosaic: J. L. Dickson, L. A. Kerber, C. I. Fassett, B. L. Ehlmann, A Global, Blended CTX Mosaic of Mars with Vectorized Seam Mapping: A New Mosaicking Pipeline Using Principles of Non-Destructive Image Editing, in: Lunar and Planetary Science Conference (2018), p. 2480.

**** W. K. Hartmann, Martian cratering 8: Isochron refinement and the chronology of Mars, Icarus 174 (2) (2005) 294–320. doi:10.1016/j.icarus.2004.11.023.

***** G. G. Michael, T. Kneissl, A. Neesemann, Planetary surface dating from crater size-frequency distribution measurements: Poisson timing analysis, Icarus 277 (2016) 279–285. doi:10.1016/j.icarus.2016.05.019.

The crater_counting.csv table contains the location and size of impact craters used to derive the ages of the 49 craters younger than 600 Ma old presented in this study.

SM_mars_crater_dating.xlsx 表格包含了本研究中用于测年的49个年龄小于600 Ma的火星撞击坑的全部相关数据。

### 表格字段如下：
1. 陨石坑编号（CRATER ID）
2. 陨石坑名称（CRATER NAME）
3. 直径（千米，DIAM KM）
4. 纬度（LAT）
5. 经度（LONG）
6. 坑缘深度（千米，DEPTH RIM KM）
7. 表面深度（千米，DEPTH SURF KM）
8. 坑底深度（千米，DEPTH FLOOR KM）
9. 层数（NUMBER LAYER）
10. 喷出物形态（MORPHO EJECTA）
11. 保存状态（PRESERVATION）
12. 计数面积（平方千米，COUNT AREA KM2）：基于喷出物毯映射的计数区域
13. ASCI计数面积（平方千米，COUNT AREA ASCI* KM2）：移除受次生陨石坑污染的表面后的计数区域
* ASCI（Automatic Secondary Crater Identification，自动次生陨石坑识别算法）：A. Lagain, K. Servis, G. K. Benedix, C. Norman, S. Anderson, P. A. Bland, Model Age Derivation of Large Martian Impact Craters, Using Automatic Crater Counting Methods, Earth and Space Science 8 (2) (2021). doi:10.1029/2020EA001598.
14. 阈值面积（平方千米，THRESHOLD AREA KM2）：沃罗诺伊（Voronoi）多边形面积的最小值，小于该值的所有关联检测到的陨石坑均被视为次生陨石坑
15. NB SEC：通过ASCI识别的次生陨石坑数量
16. 次生陨石坑占比（PERCENT SEC）
17. NB CRAT 100M：在计数区域内，通过CDA**在CTX全局镶嵌图***上检测到的直径大于100米的陨石坑总数
** CDA（Crater Detection Algorithm，陨石坑检测算法）：G. K. Benedix, A. Lagain, K. Chai, S. Meka, S. Anderson, C. Norman, P. A. Bland, J. Paxman, M. C. Towner, T. Tan, Deriving Surface Ages on Mars Using Automated Crater Counting, Earth and Space Science 7 (3) (2020). doi:10.1029/2019EA001005.
*** CTX全局镶嵌图（Context Camera global mosaic）：J. L. Dickson, L. A. Kerber, C. I. Fassett, B. L. Ehlmann, A Global, Blended CTX Mosaic of Mars with Vectorized Seam Mapping: A New Mosaicking Pipeline Using Principles of Non-Destructive Image Editing, in: Lunar and Planetary Science Conference (2018), p. 2480.
18. NB PRIM 100M：通过ASCI识别为原生陨石坑的数量
19. TURNOFF DIAM KM：用于拟合等时线陨石坑尺寸频率分布（Crater-Size Frequency Distribution, CSFD）的最小陨石坑直径
20. NB CRAT FIT：用于拟合等时线CSFD的陨石坑数量
21. 模型年龄（Ga，AGE GA）：基于Hartmann（2005）年代学模型****与Michael等人（2016）拟合技术*****的模型年龄
**** W. K. Hartmann, Martian cratering 8: Isochron refinement and the chronology of Mars, Icarus 174 (2) (2005) 294–320. doi:10.1016/j.icarus.2004.11.023.
***** G. G. Michael, T. Kneissl, A. Neesemann, Planetary surface dating from crater size-frequency distribution measurements: Poisson timing analysis, Icarus 277 (2016) 279–285. doi:10.1016/j.icarus.2016.05.019.
22. 最大模型年龄（Ga，AGE MAX GA）
23. 最小模型年龄（Ga，AGE MIN GA）
24. N(1)：每平方千米内直径大于1千米的累积陨石坑等效数量
25. N(1)最大值（N(1) MAX）
26. N(1)最小值（N(1) MIN）

crater_counting.csv 表格包含了本研究中用于推导49个年龄小于600 Ma的火星撞击坑测年结果的撞击坑位置与尺寸数据。