Comparison of SP DTMs in the vicinity of CR1. Each dataset is presented as a shaded-relief image in a south polar stereographic projection with an illumination altitude of 30° and an azimuth of 315° clockwise from north. The DTMs shown are as follows. (a) LALT DTM (ID: LALT_GT_SP_NUM; regridded at ~236.90 × 236.90 m). (b) LDEM (ID: LDEM_875S_5M_FLOAT; we used this product as a vertical source of controlled DTMs as described later). (c) One of SPLDEM2021 (ID: Site01_final_adj_5mpp_surf). (d) DTM TC ORTHO (each product shows NoData holes from per-scene coverage and shadow masking), four overlapping DTMs without manual georeferencing (see Table 2 for IDs of CR1; we used this product as a vertical source of controlled DTMs as described later). (e) DEM TC ORTHO (each of them is a composite product that gap-fills across scenes but can introduce horizontal/vertical offsets at joins), ID: DTMTCOw01_00570S897E1937PS. (f) SLDEM2013, 41 DTMs (products with IDs between DTM_MAP_01_S89E200S90E201SC and DTM_MAP_01_S89E240S90E241SC in sequential order). (g) LROC DTM produced by the ESA lander mission (ID: NAC_DTM_ESALL_CR1). (h) LROC DTM produced by the USGS (ID: MOON_LRO_NAC_DEM_89S210E_4mp). (i) CE2 CCD stereo global DEM (ID: CE2_GRAS_DEM_20m_N001_87S000W_A). DTMs around the CR1 region that contain many NoData pixels, have insufficient spatial resolutions, or are publicly inaccessible are not included.