Repository: Characteristics of the Basal Interface of the Martian South Polar Layered Deposits

Repository: Characteristics of the Basal Interface of the Martian South Polar Layered Deposits Khuller and Plaut (2021) The following files contain point and map data in the form of: (1) Shapefiles (file formats .cpg, .dbf, .prj, .sbn, .sbx, .shp, .shx and .xml) (2) TIF files (file formats .tif, .xml, .ovr and .tfw) (3) Comma Separated Value (CSV) files. All files can be viewed in geographic information system (GIS) software such as ArcGIS. Contents: 1. Elevation (points) of South Polar Layered Deposits Basal Interface (km) derived from MARSIS data SPLD_Elevation 2. Time Delay and Thickness (points) of South Polar Layered Deposits Basal Interface derived from MARSIS data SPLD_Time_Delay 3. Elevation (interpolated) of South Polar Layered Deposits (km) derived from MARSIS data SPLD_Elevation_Interp 4. Thickness (interpolated) of South Polar Layered Deposits (km) derived from MARSIS data SPLD_Thickness_Interp 5. Brightness and Thickness of Surface and Basal Interface of the South Polar Layered Deposits using non-interpolated MARSIS data a) SPLD_3MHz_Brightness_Uninterp b) SPLD_4MHz_Brightness_Uninterp c) SPLD_5MHz_Brightness_Uninterp 6. Brightness and Thickness of Surface and Basal Interface of the South Polar Layered Deposits using non-interpolated MARSIS data a) SPLD_3MHz_Histograms_Data b) SPLD_4MHz_Histograms_Data c) SPLD_5MHz_Histograms_Data Legend (Explanation of field names for each group described above): 1. Elevation (points) of South Polar Layered Deposits Basal Interface (km) derived from MARSIS data a) lat = Planetocentric latitude b) lon = Planetocentric longitude c) elevation = Elevation with respect to the IAU Mars Reference Ellipsoid (km) 2. Time Delay and Thickness (points) of South Polar Layered Deposits Basal Interface derived from MARSIS data a) lat = Planetocentric latitude b) lon = Planetocentric longitude c) elevation = Elevation with respect to the IAU Mars Reference Ellipsoid (km) d) RASTERVALU = MOLA surface elevation (km) e) Thickness = Derived thickness of the SPLD (km) f) Time_Delay = One-way time delay of the SPLD basal interface(microseconds) 3. Elevation (interpolated) of South Polar Layered Deposits (km) derived from MARSIS data 4. Thickness (interpolated) of South Polar Layered Deposits (km) derived from MARSIS data 5. Brightness and Thickness of Surface and Basal Interface of the South Polar Layered Deposits using non-interpolated MARSIS data a) lat = Planetocentric latitude b) lon = Planetocentric longitude c) sub_elevat = Elevation of basal interface with respect to the IAU Mars Reference Ellipsoid (km) d) surf_eleva = Elevation of surface overlying basal interface with respect to the IAU Mars Reference Ellipsoid (km) e) slice = Slice number from MARSIS 3D volume f) sub_bright = Data Number (DN) value from non-interpolated MARSIS data for the SPLD basal interface g) surf_brigh = Data Number (DN) value from non-interpolated MARSIS data for the SPLD surface overlying basal interface h) Thickness = Derived thickness of the SPLD (km) i) db_subsurf = Power value (decibels) from non-interpolated MARSIS data for the SPLD basal interface j) db_subsurf = Power value (decibels) from non-interpolated MARSIS data for the SPLD surface overlying basal interface k) Delta_brig = Relative power value (decibels) from non-interpolated MARSIS data for the SPLD basal interface subtracted from the surface overlying basal interface l) avg_norm_b = Relative power value (decibels) from non-interpolated MARSIS data for the SPLD basal interface subtracted from the average surface of the SPLD 6. Brightness and Thickness of Surface and Basal Interface of the South Polar Layered Deposits using non-interpolated MARSIS data a) lat = Planetocentric latitude b) lon = Planetocentric longitude c) sub_elevat = Elevation of basal interface with respect to the IAU Mars Reference Ellipsoid (km) d) surf_eleva = Elevation of surface overlying basal interface with respect to the IAU Mars Reference Ellipsoid (km) e) slice = Slice number from MARSIS 3D volume f) sub_bright = Data Number (DN) value from non-interpolated MARSIS data for the SPLD basal interface g) surf_brigh = Data Number (DN) value from non-interpolated MARSIS data for the SPLD surface overlying basal interface h) Thickness = Derived thickness of the SPLD (km) i) db_subsurf = Power value (decibels) from non-interpolated MARSIS data for the SPLD basal interface j) db_subsurf = Power value (decibels) from non-interpolated MARSIS data for the SPLD surface overlying basal interface k) Delta_brig = Relative power value (decibels) from non-interpolated MARSIS data for the SPLD basal interface subtracted from the surface overlying basal interface

数据集仓库：火星南极层状沉积（South Polar Layered Deposits, SPLD）底部界面特征（Khuller与Plaut，2021）
本仓库包含以下三类数据文件：
1. 形状文件（格式包含.cpg、.dbf、.prj、.sbn、.sbx、.shp、.shx及.xml）
2. 标签图像文件格式（Tagged Image File Format, TIF）文件（格式包含.tif、.xml、.ovr及.tfw）
3. 逗号分隔值（Comma Separated Value, CSV）文件
所有文件均可在地理信息系统（Geographic Information System, GIS）软件（如ArcGIS）中查看。

### 数据内容
1. 基于火星地下及电离层高级探测雷达（Mars Advanced Radar for Subsurface and Ionosphere Sounding, MARSIS）数据提取的SPLD底部界面高程（点位数据，单位：千米），对应文件：SPLD_Elevation
2. 基于MARSIS数据提取的SPLD底部界面时延与厚度（点位数据），对应文件：SPLD_Time_Delay
3. 基于MARSIS数据插值得到的SPLD高程（单位：千米），对应文件：SPLD_Elevation_Interp
4. 基于MARSIS数据插值得到的SPLD厚度（单位：千米），对应文件：SPLD_Thickness_Interp
5. 使用未插值MARSIS数据得到的SPLD表面与底部界面的亮度与厚度数据集，包含3个子文件：
a) SPLD_3MHz_Brightness_Uninterp
b) SPLD_4MHz_Brightness_Uninterp
c) SPLD_5MHz_Brightness_Uninterp
6. 使用未插值MARSIS数据得到的SPLD表面与底部界面的亮度与厚度直方图数据集，包含3个子文件：
a) SPLD_3MHz_Histograms_Data
b) SPLD_4MHz_Histograms_Data
c) SPLD_5MHz_Histograms_Data

### 图例（各数据组字段说明）
1. 第一组数据（SPLD_Elevation）字段解释：
a) lat：行星中心纬度
b) lon：行星中心经度
c) elevation：相对于国际天文学联合会（International Astronomical Union, IAU）火星参考椭球的高程（单位：千米）
2. 第二组数据（SPLD_Time_Delay）字段解释：
a) lat：行星中心纬度
b) lon：行星中心经度
c) elevation：相对于IAU火星参考椭球的高程（单位：千米）
d) RASTERVALU：火星轨道器激光高度计（Mars Orbiter Laser Altimeter, MOLA）表面高程（单位：千米）
e) Thickness：提取得到的SPLD厚度（单位：千米）
f) Time_Delay：SPLD底部界面的单程传播时延（单位：微秒）
3. 第三组数据（SPLD_Elevation_Interp）：基于MARSIS数据插值得到的SPLD高程（单位：千米）
4. 第四组数据（SPLD_Thickness_Interp）：基于MARSIS数据插值得到的SPLD厚度（单位：千米）
5. 第五组数据（未插值MARSIS数据的SPLD表面与底部界面亮度厚度数据）字段解释：
a) lat：行星中心纬度
b) lon：行星中心经度
c) sub_elevat：SPLD底部界面相对于IAU火星参考椭球的高程（单位：千米）
d) surf_eleva：覆盖于SPLD底部界面之上的地表高程（相对于IAU火星参考椭球，单位：千米）
e) slice：MARSIS三维体数据的切片编号
f) sub_bright：SPLD底部界面的未插值MARSIS数据的数字序号（Data Number, DN）值
g) surf_brigh：SPLD底部界面上方地表的未插值MARSIS数据的DN值
h) Thickness：提取得到的SPLD厚度（单位：千米）
i) db_subsurf：SPLD底部界面的未插值MARSIS数据功率值（单位：分贝）
j) db_subsurf：SPLD底部界面上方地表的未插值MARSIS数据功率值（单位：分贝）
k) Delta_brig：SPLD底部界面上方地表的未插值MARSIS数据功率值减去SPLD底部界面功率值所得的相对功率值（单位：分贝）
l) avg_norm_b：SPLD表面平均功率值减去SPLD底部界面的未插值MARSIS数据相对功率值（单位：分贝）
6. 第六组数据（SPLD直方图数据集）字段解释与第五组完全一致：
a) lat：行星中心纬度
b) lon：行星中心经度
c) sub_elevat：SPLD底部界面相对于IAU火星参考椭球的高程（单位：千米）
d) surf_eleva：覆盖于SPLD底部界面之上的地表高程（相对于IAU火星参考椭球，单位：千米）
e) slice：MARSIS三维体数据的切片编号
f) sub_bright：SPLD底部界面的未插值MARSIS数据的DN值
g) surf_brigh：SPLD底部界面上方地表的未插值MARSIS数据的DN值
h) Thickness：提取得到的SPLD厚度（单位：千米）
i) db_subsurf：SPLD底部界面的未插值MARSIS数据功率值（单位：分贝）
j) db_subsurf：SPLD底部界面上方地表的未插值MARSIS数据功率值（单位：分贝）
k) Delta_brig：SPLD底部界面上方地表的未插值MARSIS数据功率值减去SPLD底部界面功率值所得的相对功率值（单位：分贝）