''' How to use this script:
- put AirSimClient.py and this file in the same folder
- modify root path in main function root = join('/home/zhudelong/Videos/airsim', str(sample_idx))
- modify the sample_idx in main function for "each new sampling location" sample_idx = 0
- drag the drone to desired position
- run airsim, then this script
- after sampling one round, please slack Deron for checking
'''