A laser altimeter for topographic mapping has beenincluded in Chandrayaan-1 payloads. Togetherwith TMC, it should be able to provide a digitalelevation map of the Moon with 5m spatial resolution.The LLRI observations are not dependenton solar illumination and, therefore the shadowedareas of the Moon can also be mapped. The altimetryinformation will be used to correct the dataobtained by other instruments for viewing geometry.The LLRI employs a transmitting and a receivingoptics for the 1064 nm Nd-Yag laser beam tomeasure the roundtrip travel time which is convertedinto altitude information. The instrumenthas been described in detail elsewhere (Kamalakaret al 2005).
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