HRSC strip products are currently being assessed as base images for automatic co-registration of thousands of high-resolution images, making them geometrically consistent with the surface conditions imaged by HRSC. HRSC orthorectified strip images from 12.5 to 50 m have also been produced from the base DTMs and these have been processed into a 12.5 m mosaic. The accuracy of the HRSC orbital DTMs are compared against a MOLA reference with good results. DTM products have been produced with more than twice the resolution (50 m/pixel) of the gridded Mars Orbiter Laser Altimeter (MOLA) 512 pixels/degree (112 m/pixel) over the South Polar Residual Cap (SPRC) and the Mars South Polar region (82° - 90° S) in MOLA and areoid reference.
A modified version (Kim and Muller, 2009) of a NASA-VICAR-based pipeline developed by DLR (German Aerospace Centre) and JPL (Jet Propulsion Laboratory) has been employed with image matching based on the Gotcha (Gruen-Otto-Chau) algorithm (Shin and Muller, 2012) with a specialised setup for the polar region. Icarus, 211(2), 1066-1081.The first high-resolution Digital Terrain Model (DTM) of the entire South Pole of Mars has been produced. Initial observations from the lunar orbiter laser altimeter Sun, X., Liiva, P., Mao, D., Smith, J.C., & Bartels, A. Reconnaissance Orbiter Camera Permanently Shadowed Region Imaging
For PSRsįrom 81° S to 82° S, the polar DTMs are 240 m/px. For PSRsįrom 82° S to 90° S, the polar DTMs are 60 m/px. To identify PSRs, the horizon elevation wasĭetermined in several directions based on polar DTMs. (larger than 10 square km) from images created by MazaricoĮt al. The companion shapefile is a digitization of south pole PSRs In Lunar and Planetary Science Conference (Vol. Lunar Reconnaissance Orbiter Camera Permanently Shadowed Region Imaging - Atlas and Controlled Mosaics. When citing this product, use the following reference:Ĭisneros, E., Awumah, A., Brown, H. The final mosaic is a 8-bit product masked toĪll of the images in the mosaic can also be found in the LROC NAC images are no longer in I/F, but instead have arbitrary unitsįrom 3 - 253 with 0 as no data values and 2 as below the NACĭetection threshold. Stretched using 0 as black and the median of all the images 98% Include only permanently shadowed terrain.įor the stretched version of the mosaic, images in each PSR are Images trimmed by a shapefile of PSRs derived from LOLA data to This 10 m/pixel PSR mosaic extendsįrom 80° S to the pole with Narrow Angle Camera (NAC) NAC images are map projected onto the LOLA polar digital terrain Pixel values as seen in laboratory measurements Lowest DN (9 < DN < 20) and DN ≤ 9 are set to special The low signal found in PSRs also requires additional calibration.Īfter dark subtraction, a linearization is performed for the Resolution compared to typical NAC images (Cisneros et al. Increased exposure times for PSR imaging (20x to 80x) leads toĮlongated pixels (10 m to 40 m by 1 m to 4 m) and reduced image The PSRs are illuminatedīy light reflected from nearby illuminated terrain, including Illuminated for the majority of the year. Shadowed Regions (PSRs), while other nearby regions remain
Near the poles never see the Sun and are called Permanently Due to the tilt of the Moon's spin axis (1.54°), some areas
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