echopype_notes.md

2018/02/03-04

• Things to be changed in zplsc_b.py
  • make a new generic filename matcher to get file date and time
  • use default logging module to replace call to log
  • need to deal with InstrumentDataException part -- learn how to write error-exception stuff
• Start reading zplsc_b.py and zplsc_echogram.py to see waht can be stripped offset
• function read_header gives config_header and config_transducer
• don't need ZplscBParticleKey.ECHOGRAM_PATH, can also take out anything with relpath
• need to change from datetime import datetime to from datetime import datetime as dt and replace all datetime to dt in the code
• function process_sample uses build_windows_time and windows_to_ntp
• the following block in function process_sample should be stored and passed when sample_data['mode'][0] = 1

  # Read the athwartship and alongship angle measurements
  if sample_data['mode'][0] > 1:
      numpy.fromfile(input_file, dtype=angle_dtype, count=count)
  
  

  • can do the following to get angle data out:

    angle_data = np.fromfile(input_file, dtype=angle_dtype, count=count)
    angle_data_nparray = np.vstack(angle_data)
    

    here angle_data has the same length as power_data then the output would look like:

    array([[(  1,   0)],
       [(  1,   0)],
       [(  2,   0)],
       ...,
       [(104, 107)],
       [(-26, 121)],
       [(111, 127)]], dtype=[('athwart', 'i1'), ('along', 'i1')])
    

• in read_config_header: in python 3, need to change xrange to range, and add byte declaration when using strip function for byte object (in values[i] = values[i].strip(b'\x00'))
• toward end of parse_echogram_file probably don't need to append next_time to particle_data

  particle_data = first_ping_metadata, next_time
  

• Need to check if temperature is a parameter set by user when initiating echosounder recording, or a feed-in parameters measured in real-time when recording data. If the latter, will have to return a separate variable for all temperature samples from next_sample in parse_echogram_file