Dataset: Tracking the south polar seasonal cap retreat of Mars using computer vision

These CSV files contain the ellipse fit parameters used for the analysis in Acharya, P. J., Smith, I. B., & Calvin, W. M. (2024). “Tracking the South Polar Seasonal Cap Retreat of Mars Using Computer Vision.” Icarus. DOI: 10.1016/j.icarus.2024.116104. The SPSC ellipse is derived using a mosaic of MARCI images developed by Calvin, W. M., Cantor, B. A., & James, P. B. (2017). Interannual and seasonal changes in the south seasonal polar cap of Mars: Observations from MY 28-31 using MARCI. Icarus, 292, 144-153.. Each mosaic is 1000x1000 pixels with a spatial resolution of 0.072246423 Latitude ° per pixel. The file names follow the convention ##.csv, where ## represents the Mars Year (MY). The following table shows what each variable presents. Variable Name Description [Units] Ls Solar Lonigude [°] Major Axis Semi-major axis value [Latitude °] Minor Axis Semi-minor axis value [Latitude °] Average Axis Average axis (See publication for more information) [Laitutde °] Major_Angle Rotation of the fitted ellipse from 0E (°) Dis_Center Distance between the center of the ellipse and the geographical center [Latitude °] Center X X coordinate of the center of the ellipse [Pixels] Center Y Y coordinate of the center of the ellipse [Pixels] Area Area of the ellipse [Squared kilometers] Circle_Radius The radius of the circle of best fit [Latitude °] Contour_Area Area of the SPSC [Squared kilometers]本批逗号分隔值（Comma-Separated Values，CSV）文件包含阿查里亚（Acharya, P. J.）、史密斯（Smith, I. B.）与卡尔文（Calvin, W. M.）2024年发表于《Icarus》的论文《利用计算机视觉追踪火星南极季节性冰盖退缩》（DOI: 10.1016/j.icarus.2024.116104）中分析所用的椭圆拟合参数。 本数据集所用的SPSC（南极季节性冰盖，South Polar Seasonal Cap）椭圆由卡尔文（Calvin, W. M.）、坎托（Cantor, B. A.）与詹姆斯（James, P. B.）2017年发表于《Icarus》第292卷144-153页的论文《火星南极季节性冰盖年际与季节变化：基于MARCI观测的MY 28-31任务》中构建的MARCI影像镶嵌图推导而来。每张镶嵌图分辨率为1000×1000像素，空间分辨率为每像素0.072246423个纬度度。 文件名遵循##.csv的命名规则，其中##代表火星年（Mars Year, MY）。下表说明了各变量的含义： | 变量名 | 描述[单位] | |----------------|-------------------------------------------| | Ls | 太阳赤经[°] | | Major Axis | 半长轴数值[纬度°] | | Minor Axis | 半短轴数值[纬度°] | | Average Axis | 平均轴（详见原论文）[纬度°] | | Major_Angle | 拟合椭圆相对于0E的旋转角度[°] | | Dis_Center | 椭圆中心与地理中心的距离[纬度°] | | Center X | 椭圆中心的X坐标[像素] | | Center Y | 椭圆中心的Y坐标[像素] | | Area | 椭圆面积[平方千米] | | Circle_Radius | 最佳拟合圆半径[纬度°] | | Contour_Area | 南极季节性冰盖轮廓面积[平方千米] |