hi. How can i draw the trajectory of my flight in 3d space without using GPS and may be using the Dataflash logs with imu and yaw pitch roll values. something like Reconstruction 3D flight trajectory of a quadcopter in indoor environment - YouTube
Do the logs have position estimates without the gps? You can use the pitch, roll, yaw and speed and create a 3d velocity vector which you can integrate over time to generate position estimates. The uncertainty in position might grow pretty fast without a gps, though.
If you are asking how to make a 3d plot of the data that might be better asked on a forum for the specific software you are using - python or matlab?
thanku. yes the logs have imu data and pitch yaw and roll. i was just wondering if there is something opensource to feed in this data and get a 3d trajectory
Look into python and matplotlib. Or use Octave which can run matlab scripts.