Page 10 - Spec Tech Vol 1 Issue 04
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Indigenous Space Technologies in
Chandrayaan — 1
Chandrayaan-1 Mission acquired data from altitudes of 100 km (during the initial phase) and 200
km (during the later phase of the mission) circular lunar polar orbit. A brief on the specifications
of TMC and HySI instruments and their data products are provided in this section.
Terrain Mapping Camera (TMC) Elevation Models (DEM) can be obtained from
ISSDC website at http://www.issdc.gov.in.
Terrain Mapping Camera (TMC) was
developed at SAC with stereo viewing
capability in panchromatic band, having 5 m Hyperspectral Imager (HySI)
spatial resolution and 20 km swath from an
orbit of ~100 km to obtain very high Hyperspectral Imager (HySI) with a ground
resolution Digital elevation models (DEM) of resolution cell of ~80 m mapped the lunar
the Moon. TMC data sets at spatial surface in 0.42-0.96 µm spectral range in 64
resolution of 10 m and swath of 40 km were contiguous spectral bands having 12-bit
obtained from 200-km orbit during later quantisation, in order to extract the
phase of the mission. mineralogical information of the lunar surface.
The data were acquired at ~80 m spatial
Such high resolution data sets of lunar resolution with 20 km swath from a 100-km
surface can be used for morphological altitude. Data with a spatial resolution of ~160
mapping and morphometric analysis. These m with swath coverage of ~40 km from an
studies will help in better understanding the altitude of ~200 km, collected during the later
surface processes on the Moon. phase of the mission. The high spatial and
Chandrayaan-1 mission has acquired TMC spectral resolution data from the HySI
data sets for ~1003 orbits covering instrument will help in mapping the major
equatorial and polar regions of the mineral resources of the Moon and
Moon. Lunar Digital Elevation Models understanding the lunar crustal evolutionary
(DEMs) have been generated from possible processes and also address the issues related
passes of Chandrayaan-1 TMC Stereo to the compositional variability of lunar mare
imagery (around 600+ full passes). Further basalts and nature of the basaltic source
details about the data products and Digital regions.
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