I am doing some project on Slam. I have a data set of a moving Robot which can give me the value of forward velocity(m/s) and angular velocity(rad/s) and time(s). Now if this data are provided I can find out the x,y,theta value of a Robot which I can plot and find the Robot path.
Now I am working on Graph Slam and little bit confused in this aspect. I know Graph slam also gives us path and map, but I can already determine the path using forward velocity and angular velocity then what is the need for Graph Slam?