GIS Mapping on Indian Railway off-track assets i.e. assets away from track e.g. Land bulding, Colony structure, Roads, water tanks, Hospitals, workshops, production units, training institutes, School, RDSO etc. using survey by Handheld GPS Devices for section of DEN-II/DLI as per technical guidelines issues by letter no. 2015/track-1/24(1)/18/1 dated 14.12.2018