LAST CHANGED : 2024/07/16 20:37:10 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 60 16 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 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 = nb 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 os75nb 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 teh calibration coefficients. catwt.py catxy.py **watertrack** ----------- Number of edited points: 221 out of 222 median mean std amplitude 1.0070 1.0061 0.0058 phase -0.2490 -0.2671 0.3012 ----------- **transducer-gps offset** ----------- guessing ADCP (dx=starboard, dy=fwd) meters from GPS positions from aship.agt calculation done at 2024/07/16 20:37:09 xducer_dx = 0.427995 xducer_dy = 0.213147 signal = 1503.109561 ----------- -------------------------------------------------------------------------------- ### 2. ADCP calibration -------------------------------------------------------------------------------- # Calibrations are close enough to proceed with editing. -------------------------------------------------------------------------------- ### 3. Editing points -------------------------------------------------------------------------------- ### Edit out bad values. dataviewer.py -e ### Recompute the calibration residuals. quick_adcp.py --steps2rerun navsteps:calib --auto # Recheck the calibration coeffiecients. catwt.py **watertrack** ----------- Number of edited points: 221 out of 222 median mean std amplitude 1.0060 1.0062 0.0058 phase -0.2510 -0.2666 0.3011 ----------- # There are alot of watertrack calibration points, and the standard deviation is # reasonable. After editing out the bottom data, the calibration still suggesting # a change to the phase coefficient. Since a simmilar phase calibration is # suggested for the broad band mode, we should adjust the watertrack calibration. # I've removed all artifacts from the data, so 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 223 median mean std amplitude 1.0010 1.0010 0.0058 phase -0.0095 -0.0214 0.3003 ----------- -------------------------------------------------------------------------------- ### 4. Check edited, calibrated dataset against original dataset -------------------------------------------------------------------------------- ### Run this: (Has this corrected the problems in the original?) dataviewer.py -c . ../os75nb_orig ### Run this to compare this sonar with another sonar (after both are finished) dataviewer.py -c ../os75bb . -------------------------------------------------------------------------------- ### 5. Make plots and files -------------------------------------------------------------------------------- quick_web.py --interactive ### To extract matlab files. quick_adcp.py --steps2rerun matfiles --auto ### To extract a netCDF file. adcp_nc.py adcpdb contour/os75nb MGL2402 os75nb --ship_name "M.G. Langseth" ### To look at the headers. ncdump -h contour/os75nb.nc