LAST CHANGED : 2024/07/16 20:26:23 CRUISE NAME(S) : A13p5 (mgl2402) CRUISE DATES : 2024/02/03 11:32:20 to 2024/03/23 10:54:35 SHIP NAME : M.G. Langseth PORTS : Porto Grande, Cape Verde to Cape Town, South Africa CHIEF SCIENTIST : Erickson, Zach DATABASE NAME : aship DATA FILES : mgl2024_033_41238.raw to mgl2024_082_36000.raw PROCESSOR : J. Ash STATUS : to do done ------ ----------- averaged [ X ] loaded [ X ] NOTE: heading correction instrument exists NOTE: time-dependent heading corrections applied IN the ensembles (see cal/rotate/ens_hcorr.ang) check heading correction [ X ] calibration [ X ] edited [ x ] re-check heading correction [ X ] check editing [ x ] figures [ X ] INSTRUMENT : os75 ACQUISITION : PROGRAM : uhdas PROCESSING : python LOGGING : PARAMETERS : BT : bottom track mode (on or off) SI : sampling interval or averaging period for ensemble (sec) NB : number of bins BL : bin length (m) TD : transducer depth (m) BK : blanking length (m) HO : heading offset applied by DAS (deg) HB : heading bias (deg) CRPH : compensation for roll-pitch-heading, 1:on, 0:off) yy/mm/dd hh:mm:ss BT SI NB BL TD BK HO HB CRPH 2024/02/03 11:32:20 off 300 80 8 7 8 45.10 0.00 0001 2024/02/04 12:32:19 off 300 80 8 7 8 45.10 0.00 0001 2024/02/05 13:32:18 off 300 80 8 7 8 45.10 0.00 0001 2024/02/06 14:32:20 off 300 80 8 7 8 45.10 0.00 0001 2024/02/07 15:32:19 off 300 80 8 7 8 45.10 0.00 0001 2024/02/11 15:35:00 off 300 80 8 7 8 45.10 0.00 0001 2024/02/19 13:19:37 off 300 80 8 7 8 45.10 0.00 0001 2024/02/22 16:19:36 off 300 80 8 7 8 45.10 0.00 0001 2024/02/24 18:19:37 off 300 80 8 7 8 45.10 0.00 0001 2024/02/27 21:19:36 off 300 80 8 7 8 45.10 0.00 0001 2024/02/28 22:19:38 off 300 80 8 7 8 45.10 0.00 0001 2024/03/02 00:19:37 off 300 80 8 7 8 45.10 0.00 0001 2024/03/03 01:19:35 off 300 80 8 7 8 45.10 0.00 0001 2024/03/04 02:19:37 off 300 80 8 7 8 45.10 0.00 0001 2024/03/07 05:19:36 off 300 80 8 7 8 45.10 0.00 0001 2024/03/09 07:19:38 off 300 80 8 7 8 45.10 0.00 0001 2024/03/10 08:19:36 off 300 80 8 7 8 45.10 0.00 0001 2024/03/11 09:19:37 off 300 80 8 7 8 45.10 0.00 0001 2024/03/12 10:19:35 off 300 80 8 7 8 45.10 0.00 0001 2024/03/14 12:19:35 off 300 80 8 7 8 45.10 0.00 0001 2024/03/15 13:19:36 off 300 80 8 7 8 45.10 0.00 0001 2024/03/16 14:19:37 off 300 80 8 7 8 45.10 0.00 0001 2024/03/17 15:19:35 off 300 80 8 7 8 45.10 0.00 0001 2024/03/18 16:19:36 off 300 80 8 7 8 45.10 0.00 0001 2024/03/19 17:19:36 off 300 80 8 7 8 45.10 0.00 0001 2024/03/20 18:19:35 off 300 80 8 7 8 45.10 0.00 0001 HEADING : PRIMARY : heading from gyro CORRECTION : heading correction from posmv NOTE: time-dependent heading corrections applied IN the ensembles (see cal/rotate/ens_hcorr.ang) POSITIONS : gps positions from posmv CALIBRATION : (check original processing parameters) (1) transducer alignment original transducer alignment: 45.1 additional rotation -0.2451 final transducer angle is: 45.10 - (-0.2451) = 45.3451 (2) scale factor original scale factor 1 additional scale factor 1.0053 (3) ADCP (dx=starboard, dy=fwd) meters from GPS xducer_dx xducer_dy original: -1 6 correction 0 0 final offset -1 6 COMMENTS: The cruise was re-processed without changing the navigation devices. The cruise was reprocessed because strong scattering layers near shallow water were mis-interpreted as "the bottom", causing data loss in the processed data. PROCESSOR : James Ash --- original processing parameters from dbinfo.txt ---------- ## (determined from "sonar"): model = os ## (determined from "sonar"): frequency = 75 ## (determined from "sonar"): instname = os75 ## (determined from "sonar"): pingtype = bb badbeam None beam_order None beamangle 30 configtype python cruisename MGL2402 datatype uhdas dbname aship ens_len 300 fixfile aship.gps hcorr_inst posmv pgmin 50 pingpref None proc_engine python ref_method refsm refuv_smoothwin 3 refuv_source nav sonar os75bb txy_file aship.agt xducer_dx -1 xducer_dy 6 yearbase 2024 ================================================== POST PROCESSING STEPS: ================================================== -------------------------------------------------------------------------------- ### 1. Check visual oddities -------------------------------------------------------------------------------- ### Investigate the quality of the data. plot_nav.py nav/a*.gps figview.py dataviewer.py ### Check the calibration soefficients. catwt.py catxy.py **watertrack** ----------- Number of edited points: 222 out of 224 median mean std amplitude 1.0040 1.0043 0.0072 phase -0.2135 -0.2214 0.3920 ----------- **transducer-gps offset** ----------- guessing ADCP (dx=starboard, dy=fwd) meters from GPS positions from aship.agt calculation done at 2024/07/16 20:26:22 xducer_dx = 0.262725 xducer_dy = 0.254055 signal = 1503.109561 ----------- -------------------------------------------------------------------------------- ### 2. ADCP calibration -------------------------------------------------------------------------------- # Calibrations are close enough to proceed with editing. -------------------------------------------------------------------------------- ### 3. Editing points -------------------------------------------------------------------------------- ### Edit the dataset. dataviewer.py -e ### Recompute the calibration residuals. quick_adcp.py --steps2rerun navsteps:calib --auto catwt.py **watertrack** ----------- Number of edited points: 222 out of 224 median mean std amplitude 1.0050 1.0045 0.0072 phase -0.2150 -0.2236 0.3887 ----------- # There is a lot of watertrack calibration points and the standard deviation is # not bad. After editing out the bottom data, the calibration still suggesting # a change to the phase coefficient. Since a similar phase calibration is # suggested for the narrow band mode, we should adjust the watertrack # calibration. I've removed all artifacts from the data, I will not use # the median when adjusting the calibration. I will use the grand mean of the # narrow band and broadband modes. # (1.0045 + 1.0062)/2 = 1.00535 # (-0.2236 + -0.2666)/2 = -0.2451 quick_adcp.py --steps2rerun rotate:navsteps:calib --rotate_amplitude 1.0053 --rotate_angle -0.2451 --auto # recheck the calibration **watertrack** ----------- Number of edited points: 222 out of 224 median mean std amplitude 0.9990 0.9992 0.0072 phase 0.0345 0.0214 0.3887 ----------- # Looks good. -------------------------------------------------------------------------------- ### 4. Check edited, calibrated dataset against original dataset -------------------------------------------------------------------------------- ### To compare this sonar with another sonar (after both are finished). dataviewer.py -c ../os75nb . ### I ended up cleaning up the os75bb a little more. quick_adcp.py --steps2rerun navsteps:calib --auto -------------------------------------------------------------------------------- ### 5. Make plots and files -------------------------------------------------------------------------------- ### Section off the cruise. mkdir webpy cp ../os75nb/webpy/sectinfo.txt webpy quick_web.py --redo ### To extract matlab files quick_adcp.py --steps2rerun matfiles --auto ### To extract a netCDF file adcp_nc.py adcpdb contour/os75bb MGL2402 os75bb --ship_name "M.G. Langseth" ### To look at the headers ncdump -h contour/os75bb.nc