Using osm_cartography

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Hello I am new to ROS. I want to visualise the data from OpenStreetMaps on Rviz. For that I have downloaded the .osm file. When I use the command

roslaunch osm_cartography viz_osm.launch

I am getting error,

Traceback (most recent call last):
  File "/home/pallav/catkin_ws2/src/open_street_map/osm_cartography/scripts/viz_osm", line 50, in <module>
    import geodesy.utm
  File "/home/pallav/catkin_ws2/src/geographic_info-master/geodesy/src/geodesy/utm.py", line 52, in <module>
    import pyproj
ImportError: No module named pyproj

What should I do? Thanks in advance.