A new lunar digital elevation model from the Lunar Orbiter Laser Altimeter and SELENE Terrain Camera
We present an improved lunar digital elevation model (DEM) covering latitudes within ±60°, at a horizontal resolution of 512 pixels per degree (~60 m at the equator) and a typical vertical accuracy ~3 to 4 m. This DEM is constructed from ~4.5×109geodetically-accurate topographic heights from the Lun...
| Автори: | , , , , , |
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| Інші автори: | |
| Формат: | Стаття |
| Опубліковано: |
Elsevier BV
2018
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| Онлайн доступ: | http://hdl.handle.net/1721.1/118411 https://orcid.org/0000-0003-2652-8017 |
| Резюме: | We present an improved lunar digital elevation model (DEM) covering latitudes within ±60°, at a horizontal resolution of 512 pixels per degree (~60 m at the equator) and a typical vertical accuracy ~3 to 4 m. This DEM is constructed from ~4.5×109geodetically-accurate topographic heights from the Lunar Orbiter Laser Altimeter (LOLA) onboard the Lunar Reconnaissance Orbiter, to which we co-registered 43,200 stereo-derived DEMs (each 1°×1°) from the SELENE Terrain Camera (TC) (~1010pixels total). After co-registration, approximately 90% of the TC DEMs show root-mean-square vertical residuals with the LOLA data of <5 m compared to ~ 50% prior to co-registration. We use the co-registered TC data to estimate and correct orbital and pointing geolocation errors from the LOLA altimetric profiles (typically amounting to <10 m horizontally and <1 m vertically). By combining both co-registered datasets, we obtain a near-global DEM with high geodetic accuracy, and without the need for surface interpolation. We evaluate the resulting LOLA + TC merged DEM (designated as "SLDEM2015") with particular attention to quantifying seams and crossover errors. |
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