Data package for the research article: "Antum Crater: A Window into Ganymede's Icy Evolution"

Description of this data set The file named: "Antum_Geology.zip" is a ZIP archive containing the shapefiles of the Antum crater region for which the geological context is described. Such binary files can be opened with the commercial ArcGIS software. The symbology compatible with ArcGIS is also included. The file named: "Figure4.txt" is an ASCII file containing the spectral profiles shown in Figure 4, resulting from the processing of spectroscopic data of Ganymede coming from the Galileo/NIMS mosaic G2GNANTUM_01A (PDS filename "g2g001ci.qub"), in units of spectral reflectance following photometric correction. The first column represents the NIMS set of wavelengths expressed in microns (µm), while the other two columns are respectively the mean and median spectrum. The file named: "Spectral_indices.dat" includes the spectral indices shown in Figure 5 and Figure 6, and color composite maps shown in Figure 7b and 7c. These bidimensional maps are stored as a single-precision floating-point, little-endian binary stream of bytes, ordered according to the Band Sequential (BSQ) image encoding. This file can be opened with the commercial ENVI software, and is accompanied by a ASCII header file with same filename and suffix ".hdr". Such header file includes details that are needed to properly open and read the ".dat" file without the ENVI software and regardless of the programming language being used. The file named: "ROIs_spectra.txt" is an ASCII file containing the average spectral profiles of the six ROIs shown in Figure 8, in units of spectral reflectance following photometric correction. The first column is the NIMS set of wavelengths expressed in microns (µm), while the other columns are the average spectra of the six ROIs (from left to right: cf1, cf2, de1, de2, or1, or2). The file named: "Figure 10.dat" includes the processed data shown in Figure 10 and related to water ice grain size as derived form FCLS unmixing. These bidimensional maps are stored as a single-precision floating-point, little-endian binary stream of bytes, ordered according to the Band Sequential (BSQ) image encoding. This file can be opened with the commercial ENVI software, and is accompanied by a ASCII header file with same filename and suffix ".hdr". Such header file includes details that are needed to properly open and read the ".dat" file without the ENVI software and regardless of the programming language being used. The file named: "Figure 11.dat" includes the processed data shown in Figure 11 and Table 2, related to the scalar coefficients of the main spectral endmembers following FCLS unmixing. These bidimensional maps are stored as a single-precision floating-point, little-endian binary stream of bytes, ordered according to the Band Sequential (BSQ) image encoding. This file can be opened with the commercial ENVI software, and is accompanied by a ASCII header file with same filename and suffix ".hdr". Such header file includes details that are needed to properly open and read the ".dat" file without the ENVI software and regardless of the programming language being used. The file "iSALE_inputfiles.zip" is a ZIP archive containing ASCII input files for the impact crater modeling carried out with the iSALE code. There are two types of input files: those with filename "ast_*" contain descriptions of the Eulerial grid and the projectile kinetic energy and size, while those with filename "mat_*" describe the strength models of each material used for both the projectile and the target. The other values in the filename refer to: (i) projectile radius (600 m, 700 m, 750 m); (ii) impact speed (10 km/s, 15 km/s, 20 km/s); (iii) thermal gradient (5 K/km, 10 K/km, 15 K/km, present only in the "ast_*" input file); and (iv) thickness of the upper porous layer (0 km, 0.5 km, 1 km, 2 km).本数据集说明如下： 文件"Antum_Geology.zip"为压缩归档文件，内含安图姆撞击坑区域的形状文件（shapefile），该区域的地质背景已被详细描述。此类二进制文件可通过商业软件ArcGIS打开，同时附带了与ArcGIS兼容的符号系统。 文件"Figure4.txt"为ASCII文件，内含图4所示的光谱剖面数据。该数据源自伽利略号（Galileo）近红外绘图光谱仪（NIMS）拼接数据集G2GNANTUM_01A（行星数据系统（Planetary Data System，PDS）文件名：g2g001ci.qub）的木卫三（Ganymede）光谱数据，以经过光度校正后的光谱反射率为单位。文件第一列为以微米（µm）为单位的NIMS波长序列，其余两列分别为平均光谱与中位光谱。 文件"Spectral_indices.dat"内含图5、图6所示的光谱指数，以及图7b、7c所示的彩色合成影像。此类二维影像以单精度浮点型小端字节二进制流存储，遵循波段顺序（Band Sequential，BSQ）编码格式。该文件可通过商业软件ENVI打开，同时附带同名ASCII头文件（后缀为".hdr"）。该头文件包含必要的元数据信息，可在未安装ENVI软件的前提下，通过任意编程语言正确读取该".dat"文件。 文件"ROIs_spectra.txt"为ASCII文件，内含图8所示的6个感兴趣区域（Region of Interest，ROI）的平均光谱剖面，单位为经光度校正后的光谱反射率。文件第一列为以微米（µm）为单位的NIMS波长序列，其余列依次为6个感兴趣区域的平均光谱（从左至右分别为cf1、cf2、de1、de2、or1、or2）。 文件"Figure 10.dat"内含图10所示的处理后数据，该数据对应基于完全约束最小二乘解混（Fully Constrained Least Squares Unmixing，FCLS）得到的水冰晶粒尺度信息。此类二维影像以单精度浮点型小端字节二进制流存储，遵循波段顺序（Band Sequential，BSQ）编码格式。该文件可通过商业软件ENVI打开，同时附带同名ASCII头文件（后缀为".hdr"）。该头文件包含必要的元数据信息，可在未安装ENVI软件的前提下，通过任意编程语言正确读取该".dat"文件。 文件"Figure 11.dat"内含图11与表2所示的处理后数据，对应基于FCLS解混得到的主要光谱端元的标量系数。此类二维影像以单精度浮点型小端字节二进制流存储，遵循波段顺序（Band Sequential，BSQ）编码格式。该文件可通过商业软件ENVI打开，同时附带同名ASCII头文件（后缀为".hdr"）。该头文件包含必要的元数据信息，可在未安装ENVI软件的前提下，通过任意编程语言正确读取该".dat"文件。 文件"iSALE_inputfiles.zip"为压缩归档文件，内含用于iSALE代码开展撞击坑模拟的ASCII输入文件。输入文件分为两类：以"ast_*"命名的文件包含欧拉网格、抛射体动能与尺寸的相关描述；以"mat_*"命名的文件描述抛射体与靶体所用各材料的强度模型。文件名中其余参数含义如下：(i) 抛射体半径（600 m、700 m、750 m）；(ii) 撞击速度（10 km/s、15 km/s、20 km/s）；(iii) 热梯度（5 K/km、10 K/km、15 K/km，仅存在于"ast_*"类输入文件中）；(iv) 上部多孔层厚度（0 km、0.5 km、1 km、2 km）。