Overview of Chandrayaan-1 Mission
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)
Terrain Mapping Camera (TMC) was developed at SAC with stereo viewing capability in panchromatic band, having 5 m spatial resolution and 20 km swath from an orbit of ~100 km to obtain very high-resolution Digital elevation models (DEM) of the Moon. TMC data sets at spatial resolution of 10 m and swath of 40 km were obtained from 200-km orbit during later phase of the mission.
Technical specifications of TMC are given in Annexure-1. Such high resolution data sets of lunar surface can be used for morphological mapping and morphometric analysis. These studies will help in better understanding the surface processes on the Moon. Chandrayaan-1 mission has acquired TMC data sets for ~1003 orbits covering equatorial and polar regions of the Moon. Lunar Digital Elevation Models (DEMs) have been generated from possible passes of Chandrayaan-1 TMC Stereo imagery (around 600+ full passes). Further details about the data products and Digital Elevation Models (DEM) can be obtained from ISSDC website at http://www.issdc.gov.in.
Hyperspectral Imager (HySI)
Hyperspectral Imager (HySI) with a ground resolution cell of ~80 m mapped the lunar surface in 0.42-0.96 µm spectral range in 64 contiguous spectral bands having 12-bit quantisation, in order to extract the mineralogical information of the lunar surface. Technical specifications of HySI are given in Annexure-2. The data were acquired at ~80 m spatial resolution with 20 km swath from a 100-km altitude. Data with a spatial resolution of ~160 m with swath coverage of ~40 km from an altitude of ~200 km, collected during the later phase of the mission are also available. Band to Band registered (BBR) data products of HySI for ~552 lunar orbits are available in the archive. The high spatial and spectral resolution data from the HySI instrument will help in mapping the major mineral resources of the Moon and understanding the lunar crustal evolutionary processes and also address the issues related to the compositional variability of lunar mare basalts and nature of the basaltic source regions.