MOLA reference DTM and aligned HRSC DTM mosaic at the Martian South Pole

Datasets from Xiao et al. (2022, in revision with Planetary and Space Science) titled "Prospects for Mapping Temporal Height Variations of the Seasonal CO2 Snow/Ice Caps at the Martian Poles by Co-registration of MOLA Profiles". An initial version of the manuscript can be accessed at https://arxiv.org/abs/2109.04899.

## abbreviations
Mars Orbiter Laser Altimeter (MOLA)
Digital Terrain Model (DTM)
University College London (UCL)
High-Resolution Stereo Camera (HRSC)

MOLA_reference_DTM_from_self_registration.tif is the reference DTM generated from self-registration of the reprocessed MOLA profiles. The heights are references to a Martian sphere of 3396 km. It covers the region poleward of 78°S with a resolution of 500 m/pixel. Projection is polar stereographic centered at the South Pole. Number_footprints_per_pixel_MOLA_reference_DTM.tif is the map that demonstrates the number of available MOLA footprints (after reprocessing and self-registration) within each of the grid element for the generation of MOLA_reference_DTM_from_self_registration.tif.

The original UCL HRSC DTMs at the Martian South Pole, with a gridding resolution of 50 m/pixel, can be accessed at https://www.cosmos.esa.int/web/psa/UCL-MSSL_iMars_HRSC_v1.0. Please also refer to Putri, A. R. D., Sidiropoulos, P., Muller, J. P., Walter, S. H., & Michael, G. G. (2019). A New South Polar Digital Terrain Model of Mars from the High-Resolution Stereo Camera (HRSC) onboard the ESA Mars Express. Planetary and Space Science, 174, 43-55.

UCL_HRSC_DTMs_mosaic_after_alignment_to_MOLA_reference.tif is the mosaic of these UCL HRSC DTMs after being aligned to the self-registered MOLA profiles, which are used to generate MOLA_reference_DTM_from_self_registration.tif. Grid size is 50 m/pixel with a stereographic projection centered at South Pole.

Height_difference_before_alignment.tif and Height_difference_after_alignment.tif show the relative height differences between these HRSC DTMs and the self-registered MOLA profiles before and after the alignment, respectively. Grid size is 170 m/pixel with a stereographic projection centered at South Pole. Relative tilts of magnitudes up to ~10 m are ubiquitous before the alignment. Meanwhile, after the alignment, height differences are homogeneous with magnitudes typically less than 2 m.

小等人在《行星与空间科学》杂志的修订中提出了名为《通过共注册 MOLA 剖面绘制火星两极季节性二氧化碳雪/冰帽高度变化的展望》的数据集。该文稿的早期版本可通过以下链接获取：https://arxiv.org/abs/2109.04899。数据集包括由火星轨道激光高度计（MOLA）自注册重新处理生成的参考数字高程模型（DTM），其高度参照3396公里火星球体。该模型覆盖了78°S以北的区域，分辨率为每像素500米。投影采用以南极为中心的极地正射投影。数字足迹每像素数（Number_footprints_per_pixel_MOLA_reference_DTM.tif）图展示了在生成参考数字高程模型（MOLA_reference_DTM_from_self_registration.tif）过程中，每个网格单元内可用的 MOLA 脚印数量（经过重新处理和自注册）。

在火星南极的原始伦敦大学学院（UCL）高分辨率立体相机（HRSC）DTM，分辨率为每像素50米，可通过以下链接获取：https://www.cosmos.esa.int/web/psa/UCL-MSSL_iMars_HRSC_v1.0。请参阅 Putri, A. R. D. 等人于2019年在《行星与空间科学》杂志发表的文章《基于 ESA 火星快车号上的高分辨率立体相机（HRSC）的火星南极新的数字高程模型》，文章编号为174，页码为43-55。

UCL_HRSC_DTMs_mosaic_after_alignment_to_MOLA_reference.tif 是这些 UCL HRSC DTM 在与自注册的 MOLA 剖面对齐后的拼接图，这些剖面被用于生成 MOLA_reference_DTM_from_self_registration.tif。网格尺寸为每像素50米，投影采用以南极为中心的极地正射投影。高度差异图（Height_difference_before_alignment.tif 和 Height_difference_after_alignment.tif）展示了这些 HRSC DTM 与自注册的 MOLA 剖面在对齐前后相对高度差异，网格尺寸为每像素170米，投影采用以南极为中心的极地正射投影。在对齐前，相对倾斜量可达约10米，普遍存在。而对齐后，高度差异均匀，通常小于2米。

搜集汇总

背景与挑战

背景概述

该数据集提供火星南极的高分辨率数字地形模型（DTM），包括MOLA参考DTM（500米/像素）和对齐后的HRSC DTM镶嵌图（50米/像素），通过自注册和对齐处理显著减少了高度差异（从约10米降至小于2米），适用于研究火星极地季节性CO2冰雪盖的高度变化。