NASA PDS file format

it stands for planetary data system

 how it works

NASA data archive examples

it contains data with cartographic ( think maps) and topographic info

somewhat similar to FIT and SER files

from ISRO introduction:

NASA planetary missions in the scientific
user community.
- Adopted by ESA, JAXA and other
space agencies across globe.
- Features of PDS
Self structured, documented &
Peer Review Data Sets
Long-term access and usability of data
- ISRO had also adopted PDS3 for
following missions
Chandrayaan-1
Mars Orbiter Mission.
- ISRO will adopt PDS4 for
Chandrayaan-2 and continue PDS4
for future planetary missions.
PDS Home Page (http://pds.nasa.gov)

 wiki