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<p>The seamless polar mosaicked Digital Elevation Model (DEM) has a variety of applications in lunar geology, reference image generation and can serve as base layer for mapping. Currently LROC WAC of NASA’s LRO instrument has provided a polar mosaic at 100&#xa0;m/pixel in optical band. This coarse resolution data is not sufficient in resource mapping of the lunar surface. Chandrayaan-2 having Terrain Mapping Camera (TMC) having triplet stereo capability at optical region of Electromagnetic (EM) spectrum. Therefore, using triplet stereo DEM is derived at 10&#xa0;m/pixel covering both polar &amp; non-polar regions of the lunar surface. Instead of non-polar region, the polar region has poor illumination which leads to shadow at terrain and craters base. It is observed that the shadow area is not visible in the entire strip but rather at multiple polygons as patches. These polygons are filled from external source altimeter data like LRO’s LOLA raster. As LOLA is a self-illuminating instrument irrespective of sun elevation angles are high or low. Therefore, using LOLA raster, all the TMC DEM void polygons are filled at the polar region. Before void filling a 3-D registration is applied to avoid mis-registration so that exact polygon can be fetched from LOLA raster. After filling voids in TMC DEM for both South &amp; North polar data, all the strips are mosaicked towards seamless raster generation. Further, this paper also brings out a methodology of similar mosaic raster generation for IIRS Band no. 52. (~ 1653&#xa0;nm). There are gap still exists in both TMC &amp; IIRS polar mosaic, which will be filled with more acquisition of optical data as mission operation progresses. Also highlighted the achieved positional &amp; vertical accuracy from both mosaicked IIRS and TMC data at raster level.</p>

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Development of Technique for Mosaicking of Chandrayaan-2 TMC-2 DEM and IIRS Single Band Polar Area of Moon

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Baharul Islam,
  • A. Z. Abdullah Suhail,
  • Amitabh Singh

摘要

The seamless polar mosaicked Digital Elevation Model (DEM) has a variety of applications in lunar geology, reference image generation and can serve as base layer for mapping. Currently LROC WAC of NASA’s LRO instrument has provided a polar mosaic at 100 m/pixel in optical band. This coarse resolution data is not sufficient in resource mapping of the lunar surface. Chandrayaan-2 having Terrain Mapping Camera (TMC) having triplet stereo capability at optical region of Electromagnetic (EM) spectrum. Therefore, using triplet stereo DEM is derived at 10 m/pixel covering both polar & non-polar regions of the lunar surface. Instead of non-polar region, the polar region has poor illumination which leads to shadow at terrain and craters base. It is observed that the shadow area is not visible in the entire strip but rather at multiple polygons as patches. These polygons are filled from external source altimeter data like LRO’s LOLA raster. As LOLA is a self-illuminating instrument irrespective of sun elevation angles are high or low. Therefore, using LOLA raster, all the TMC DEM void polygons are filled at the polar region. Before void filling a 3-D registration is applied to avoid mis-registration so that exact polygon can be fetched from LOLA raster. After filling voids in TMC DEM for both South & North polar data, all the strips are mosaicked towards seamless raster generation. Further, this paper also brings out a methodology of similar mosaic raster generation for IIRS Band no. 52. (~ 1653 nm). There are gap still exists in both TMC & IIRS polar mosaic, which will be filled with more acquisition of optical data as mission operation progresses. Also highlighted the achieved positional & vertical accuracy from both mosaicked IIRS and TMC data at raster level.