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Creation of acoustic sample files using OG-1.0 format #176

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jcermauwedu opened this issue Mar 19, 2024 · 6 comments
Open

Creation of acoustic sample files using OG-1.0 format #176

jcermauwedu opened this issue Mar 19, 2024 · 6 comments

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@jcermauwedu
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The first sample is a simpler case. This has been described here and a suggested solution here.

Currently flattened versions are available from here: https://hoodfish.fish.washington.edu/erddap/files/unit_507_20240304T0000_acoustic/

A more complex case would be taking account of the nominal sensor orientation with respect to measured pitch and yaw of the glider. Instead bins simply varying by depth, each bin would have a 3D coordinate.

The end result is to build a pool of gold standard example datasets to test against a future OG-1.0 compliance tester.
@jcermauwedu
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There is a treasure trove of various examples that are used for the test suite for ERDDAP. It would be quite an exercise to walk a lot of these examples (a handful) for use in OG-1.0. REF: https://github.com/ERDDAP/erddapTest.

@jcermauwedu
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The closest example that fits what was proposed is https://github.com/ERDDAP/erddapTest/blob/main/CFPointConventions/trajectoryProfile/trajectoryProfile-Multidimensional-SingleTrajectory-H.6.2/trajectoryProfile-Multidimensional-SingleTrajectory-H.6.2.cdl, which is looks identical to the proposed (N_MEASUREMENTS, N_BINS). CF:H.6.2.

@jcermauwedu
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If we want to drill down to a specific sample. Here is one profile.
unit_507_20240304T0000_acoustic_ERDDAP
unit_507_1710386001_20240314T031321Z_rt_acoustic

netCDF file: https://hoodfish.fish.washington.edu/erddap/files/unit_507_20240304T0000_acoustic/unit_507_1710386001_20240314T031321Z_rt_acoustic.nc

@jcermauwedu
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@emmerbodc Getting closer. Need to circle back on a few thing now that I have a path forward. Need to make sure it is truly CF-1.10 compliant and then we will kick it over to a PR.

$ ncdump -b c unit_507_20240304T0000_acoustic_OG/unit_507_1710362769_20240313T204609Z_rt_acoustic.nc 
netcdf unit_507_1710362769_20240313T204609Z_rt_acoustic {
dimensions:
	N_MEASUREMENTS = 66 ;
	N_BINS = 20 ;
	traj_strlen = 22 ;
variables:
	double time(N_MEASUREMENTS) ;
		time:_FillValue = -9999.9 ;
		time:standard_name = "time" ;
		time:axis = "T" ;
		time:comment = "Measured or calculated time at each point in the time-series" ;
		time:long_name = "Time" ;
		time:observation_type = "measured" ;
		time:ioos_category = "Time" ;
		time:coordinates = "lat_uv lon_uv time_uv" ;
		time:units = "seconds since 1990-01-01T00:00:00+00:00" ;
		time:calendar = "gregorian" ;
	double depth(N_MEASUREMENTS, N_BINS) ;
		depth:_FillValue = NaN ;
		depth:axis = "Z" ;
		depth:accuracy = "n/a" ;
		depth:long_name = "Depth" ;
		depth:observation_type = "calculated" ;
		depth:platform = "platform" ;
		depth:precision = "n/a" ;
		depth:resolution = "n/a" ;
		depth:positive = "down" ;
		depth:reference_datum = "sea-surface" ;
		depth:standard_name = "depth" ;
		depth:units = "m" ;
		depth:valid_max = 2000. ;
		depth:valid_min = 0. ;
		depth:ioos_category = "Location" ;
		depth:colorBarMaximum = 2000. ;
		depth:colorBarMinimum = 0. ;
		depth:colorBarPalette = "OceanDepth" ;
		depth:instrument = "instrument_altimeter" ;
		depth:comment = "Native glider sensor name" ;
		depth:coordinates = "lat_uv lon_uv time_uv" ;
	double echogram_sv(N_MEASUREMENTS, N_BINS) ;
		echogram_sv:_FillValue = NaN ;
		echogram_sv:units = "1" ;
		echogram_sv:long_name = "Volume backscattering strength" ;
		echogram_sv:colorBarMinimum = -80. ;
		echogram_sv:colorBarMaximum = -30. ;
		echogram_sv:colorBarPalette = "EK80" ;
		echogram_sv:comment = "dimensionless units (dB re 1 m-1)" ;
		echogram_sv:ioos_category = "Other" ;
		echogram_sv:standard_name = "acoustic_volume_backscattering_strength_in_sea_water" ;
		echogram_sv:platform = "platform" ;
		echogram_sv:observation_type = "measured" ;
		echogram_sv:coordinates = "lat_uv lon_uv time_uv" ;
	double lat(N_MEASUREMENTS) ;
		lat:_FillValue = NaN ;
		lat:axis = "Y" ;
		lat:comment = "Interpolated latitude at each point in the time-series" ;
		lat:coordinate_reference_frame = "urn:ogc:crs:EPSG::4326" ;
		lat:long_name = "Precise Latitude" ;
		lat:observation_type = "measured" ;
		lat:platform = "platform" ;
		lat:reference = "WGS84" ;
		lat:standard_name = "latitude" ;
		lat:units = "degrees_north" ;
		lat:valid_max = 90. ;
		lat:valid_min = -90. ;
		lat:ioos_category = "Location" ;
		lat:colorBarMaximum = 90. ;
		lat:colorBarMinimum = -90. ;
		lat:coordinates = "lat_uv lon_uv time_uv" ;
	double lon(N_MEASUREMENTS) ;
		lon:_FillValue = NaN ;
		lon:axis = "X" ;
		lon:comment = "Interpolated longitude at each point in the time-series." ;
		lon:coordinate_reference_frame = "urn:ogc:crs:EPSG::4326" ;
		lon:long_name = "Precise Longitude" ;
		lon:observation_type = "measured" ;
		lon:platform = "platform" ;
		lon:reference = "WGS84" ;
		lon:standard_name = "longitude" ;
		lon:units = "degrees_east" ;
		lon:valid_max = 180. ;
		lon:valid_min = -180. ;
		lon:ioos_category = "Location" ;
		lon:colorBarMaximum = 180. ;
		lon:colorBarMinimum = -180. ;
		lon:coordinates = "lat_uv lon_uv time_uv" ;
	double lat_uv ;
		lat_uv:_FillValue = -9999.9 ;
		lat_uv:long_name = "Depth-Averaged Latitude" ;
		lat_uv:valid_max = 90. ;
		lat_uv:observation_type = "calculated" ;
		lat_uv:colorBarMaximum = 90. ;
		lat_uv:ioos_category = "Location" ;
		lat_uv:standard_name = "latitude" ;
		lat_uv:comment = "The depth-averaged current is an estimate of the net current measured while the glider is underwater.  The value is calculated over the entire underwater segment, which may consist of 1 or more dives." ;
		lat_uv:units = "degrees_north" ;
		lat_uv:platform = "platform" ;
		lat_uv:valid_min = -90. ;
		lat_uv:colorBarMinimum = -90. ;
	double lon_uv ;
		lon_uv:_FillValue = -9999.9 ;
		lon_uv:long_name = "Depth-Averaged Longitude" ;
		lon_uv:valid_max = 180. ;
		lon_uv:observation_type = "calculated" ;
		lon_uv:colorBarMaximum = 180. ;
		lon_uv:ioos_category = "Location" ;
		lon_uv:standard_name = "longitude" ;
		lon_uv:comment = "The depth-averaged current is an estimate of the net current measured while the glider is underwater.  The value is calculated over the entire underwater segment, which may consist of 1 or more dives." ;
		lon_uv:units = "degrees_east" ;
		lon_uv:platform = "platform" ;
		lon_uv:valid_min = -180. ;
		lon_uv:colorBarMinimum = -180. ;
	double time_uv ;
		time_uv:_FillValue = -9999.9 ;
		time_uv:comment = "The depth-averaged current is an estimate of the net current measured while the glider is underwater.  The value is calculated over the entire underwater segment, which may consist of 1 or more dives." ;
		time_uv:long_name = "Depth-Averaged Time" ;
		time_uv:observation_type = "calculated" ;
		time_uv:standard_name = "time" ;
		time_uv:ioos_category = "Time" ;
		time_uv:units = "seconds since 1990-01-01T00:00:00+00:00" ;
		time_uv:calendar = "gregorian" ;
	int profile_id ;
		profile_id:_FillValue = -999 ;
		profile_id:comment = "Sequential profile number within the trajectory.  This value is unique in each file that is part of a single trajectory/deployment." ;
		profile_id:long_name = "Profile ID" ;
		profile_id:valid_max = 2147483647 ;
		profile_id:valid_min = 0 ;
		profile_id:cf_role = "profile_id" ;
		profile_id:ioos_category = "Identifier" ;
		profile_id:coordinates = "lat_uv lon_uv time_uv" ;
	double profile_lat ;
		profile_lat:_FillValue = -9999.9 ;
		profile_lat:long_name = "Profile Latitude" ;
		profile_lat:valid_max = 90. ;
		profile_lat:observation_type = "calculated" ;
		profile_lat:colorBarMaximum = 90. ;
		profile_lat:ioos_category = "Location" ;
		profile_lat:standard_name = "latitude" ;
		profile_lat:comment = "Value is interpolated to provide an estimate of the latitude at the mid-point of the profile" ;
		profile_lat:units = "degrees_north" ;
		profile_lat:platform = "platform" ;
		profile_lat:valid_min = -90. ;
		profile_lat:colorBarMinimum = -90. ;
		profile_lat:coordinates = "lat_uv lon_uv time_uv" ;
	double profile_lon ;
		profile_lon:_FillValue = -9999.9 ;
		profile_lon:long_name = "Profile Longitude" ;
		profile_lon:valid_max = 180. ;
		profile_lon:observation_type = "calculated" ;
		profile_lon:colorBarMaximum = 180. ;
		profile_lon:ioos_category = "Location" ;
		profile_lon:standard_name = "longitude" ;
		profile_lon:comment = "Value is interpolated to provide an estimate of the longitude at the mid-point of the profile" ;
		profile_lon:units = "degrees_east" ;
		profile_lon:platform = "platform" ;
		profile_lon:valid_min = -180. ;
		profile_lon:colorBarMinimum = -180. ;
		profile_lon:coordinates = "lat_uv lon_uv time_uv" ;
	double profile_time ;
		profile_time:_FillValue = -9999.9 ;
		profile_time:long_name = "Profile Time" ;
		profile_time:observation_type = "calculated" ;
		profile_time:ioos_category = "Time" ;
		profile_time:standard_name = "time" ;
		profile_time:comment = "Timestamp corresponding to the mid-point of the profile" ;
		profile_time:platform = "platform" ;
		profile_time:coordinates = "lat_uv lon_uv time_uv" ;
		profile_time:units = "seconds since 1990-01-01T00:00:00+00:00" ;
		profile_time:calendar = "gregorian" ;
	double u ;
		u:_FillValue = -9999.9 ;
		u:long_name = "Depth-Averaged Eastward Sea Water Velocity" ;
		u:valid_max = 10. ;
		u:observation_type = "calculated" ;
		u:colorBarMaximum = 0.5 ;
		u:ioos_category = "Currents" ;
		u:standard_name = "eastward_sea_water_velocity" ;
		u:comment = "The depth-averaged current is an estimate of the net current measured while the glider is underwater.  The value is calculated over the entire underwater segment, which may consist of 1 or more dives." ;
		u:units = "m.s-1" ;
		u:platform = "platform" ;
		u:valid_min = -10. ;
		u:colorBarMinimum = -0.5 ;
		u:coordinates = "lon_uv lat_uv time_uv" ;
	double v ;
		v:_FillValue = -9999.9 ;
		v:long_name = "Depth-Averaged Northward Sea Water Velocity" ;
		v:valid_max = 10. ;
		v:observation_type = "calculated" ;
		v:colorBarMaximum = 0.5 ;
		v:ioos_category = "Currents" ;
		v:standard_name = "northward_sea_water_velocity" ;
		v:comment = "The depth-averaged current is an estimate of the net current measured while the glider is underwater.  The value is calculated over the entire underwater segment, which may consist of 1 or more dives." ;
		v:units = "m.s-1" ;
		v:platform = "platform" ;
		v:valid_min = -10. ;
		v:colorBarMinimum = -0.5 ;
		v:coordinates = "lon_uv lat_uv time_uv" ;
	int platform ;
		platform:_FillValue = -999 ;
		platform:type = "platform" ;
		platform:long_name = "G507 Slocum Glider" ;
		platform:ioos_category = "Identifier" ;
		platform:wmo_id = 4802989LL ;
		platform:comment = "Teledyne Webb Research Slocum G2 Glider" ;
		platform:id = 4802989LL ;
		platform:instrument = "instrument_ctd,instrument_acoustics" ;
		platform:coordinates = "lat_uv lon_uv time_uv" ;
	int instrument_ctd ;
		instrument_ctd:_FillValue = 0 ;
		instrument_ctd:calibration_report = "n/a" ;
		instrument_ctd:long_name = "Seabird WEBB pumped glider conductivity, temperature, depth sensor" ;
		instrument_ctd:factory_calibrated = "y" ;
		instrument_ctd:type = "instrument" ;
		instrument_ctd:serial_number = "712-9221" ;
		instrument_ctd:comment = "Slocum Glider UAF G507 -- pumped CTD" ;
		instrument_ctd:user_calibrated = "n/a" ;
		instrument_ctd:platform = "platform" ;
		instrument_ctd:make_model = "Seabird Slocum Glider Payload CTD" ;
		instrument_ctd:calibration_date = "2017" ;
		instrument_ctd:coordinates = "lat_uv lon_uv time_uv" ;
	char trajectory(traj_strlen) ;
		trajectory:cf_role = "trajectory_id" ;
		trajectory:long_name = "Trajectory/Deployment Name" ;
		trajectory:comment = "A trajectory is a single deployment of a glider and may span multiple data files." ;
		trajectory:ioos_category = "Identifier" ;
		trajectory:coordinates = "lat_uv lon_uv time_uv" ;

// global attributes:
		:Conventions = "OG-1.0,CF-1.10" ;
		:date_created = "2024-03-22T01:21:12Z" ;
		:featureType = "trajectoryProfile" ;
		:cdm_data_type = "trajectory" ;
		:comment = "UAF G507 Glider deployment in the North Pacific Ocean (March 2024)" ;
		:format_version = "IOOS_Glider_NetCDF_v2.0.nc" ;
		:keywords_vocabulary = "GCMD Science Keywords" ;
		:keywords = "Oceans > Ocean Pressure > Water Pressure, Oceans > Ocean Temperature > Water Temperature, Oceans > Salinity/Density > Conductivity, Oceans > Salinity/Density > Density, Oceans > Salinity/Density > Salinity" ;
		:license = "This data may be redistributed and used without restriction." ;
		:Metadata_Conventions = "CF-1.6, Unidata Dataset Discovery v1.0" ;
		:metadata_link = "https://gliders.ioos.us/erddap/info/unit_507-20240304T0000/index.html" ;
		:platform_type = "Slocum Glider" ;
		:processing_level = "Dataset taken from glider native file format and is provided as is with no expressed or implied assurance of quality assurance or quality control." ;
		:project = "AOOS Gliders in Support of Fisheries Management" ;
		:references = "https://www.uaf.edu/cfos/" ;
		:source = "Observational data from a profiling glider" ;
		:standard_name_vocabulary = "Standard Name Table (v84a)" ;
		:summary = "UAF G507 Glider deployment in the North Pacific Ocean (March 2024)" ;
		:title = "G507 Slocum Glider Dataset (March 2024)" ;
		:acknowledgement = "This work was supported by funding from NOAA/IOOS/AOOS." ;
		:contributor_email = "[email protected]" ;
		:contributor_name = "Seth Danielson" ;
		:contributor_role = "Principal Investigator" ;
		:contributor_url = "https://www.uaf.edu/cfos/people/faculty/detail/seth-danielson.php" ;
		:creator_email = "[email protected]" ;
		:creator_name = "Hank Statscewich" ;
		:creator_url = "https://uaf.edu/cfos/people/research-staff-and-post-docs/detail/hank-statscewich.php" ;
		:institution = "The University of Alaska Fairbanks College of Fisheries and Ocean Sciences" ;
		:ioos_regional_association = "aoos" ;
		:naming_authority = "edu.alaska" ;
		:platform_tags = "portal:25,axds:portal:25:tag:Gliders,axds:dashboard:glider:EcoMetrics Dashboard" ;
		:publisher_email = "[email protected]" ;
		:publisher_name = "AOOS Glider Observatory" ;
		:publisher_url = "https://aoos.org" ;
		:sea_name = "North Pacific Ocean" ;
		:support_email = "[email protected],[email protected],[email protected]" ;
		:support_name = "aoos,ioos,noaa" ;
		:support_role = "fiscal,fiscal,fiscal" ;
		:support_type = "ra,federal,federal" ;
		:wmo_id = 4802989LL ;
		:geospatial_lat_min = 59.83922 ;
		:geospatial_lat_max = 59.8421 ;
		:geospatial_lon_min = -149.47692 ;
		:geospatial_lon_max = -149.47529 ;
		:geospatial_bounds = "POLYGON ((59.842100 -149.476920, 59.842100 -149.475290, 59.839220 -149.475290, 59.839220 -149.476920, 59.842100 -149.476920))" ;
		:geospatial_vertical_min = 1.407026 ;
		:geospatial_vertical_max = 200.89151 ;
		:geospatial_vertical_units = "m" ;
		:time_coverage_start = "2024-03-13T20:46:09Z" ;
		:time_coverage_end = "2024-03-13T21:07:11Z" ;
		:time_coverage_duration = "P0DT0H21M2.478820864S" ;
		:date_issued = "2024-03-22T01:21:12Z" ;
		:date_modified = "2024-03-22T01:21:12Z" ;
		:history = "2024-03-22T01:21:12Z - Created with the GUTILS package: https://github.com/SECOORA/GUTILS" ;
		:id = "unit_507-20240304T0000" ;
data:

 time = 1079210769.3107, 1079210823.87811, 1079210843.11444, 
    1079210861.31677, 1079210880.47821, 1079210899.73987, 1079210917.97824, 
    1079210937.21442, 1079210955.51129, 1079210974.69778, 1079210993.93704, 
    1079211012.13187, 1079211031.35004, 1079211050.59244, 1079211068.82413, 
    1079211088.08414, 1079211107.33133, 1079211125.5705, 1079211144.8013, 
    1079211163.98578, 1079211182.2316, 1079211201.48706, 1079211219.71576, 
    1079211238.93393, 1079211258.19183, 1079211276.35315, 1079211295.48285, 
    1079211314.59253, 1079211333.70746, 1079211351.82446, 1079211370.90518, 
    1079211389.98102, 1079211409.22284, 1079211427.41132, 1079211446.62744, 
    1079211465.88534, 1079211484.12485, 1079211503.35443, 1079211521.64407, 
    1079211540.86838, 1079211560.11118, 1079211578.29343, 1079211597.53802, 
    1079211616.76047, 1079211635.00482, 1079211654.228, 1079211673.47107, 
    1079211691.68076, 1079211710.84463, 1079211730.09985, 1079211748.30179, 
    1079211767.5639, 1079211785.86224, 1079211805.05545, 1079211824.28693, 
    1079211842.45563, 1079211861.7066, 1079211880.91977, 1079211899.16354, 
    1079211918.40506, 1079211937.64313, 1079211955.86728, 1079211975.10645, 
    1079211994.28238, 1079212012.52759, 1079212031.78952 ;

 depth =
  // depth(0, 0-19)
    143.891510009766, 146.891510009766, 149.891510009766, 152.891510009766, 
    155.891510009766, 158.891510009766, 161.891510009766, 164.891510009766, 
    167.891510009766, 170.891510009766, 173.891510009766, 176.891510009766, 
    179.891510009766, 182.891510009766, 185.891510009766, 188.891510009766, 
    191.891510009766, 194.891510009766, 197.891510009766, 200.891510009766,
  // depth(1, 0-19)
    138.106964111328, 141.106964111328, 144.106964111328, 147.106964111328, 
    150.106964111328, 153.106964111328, 156.106964111328, 159.106964111328, 
    162.106964111328, 165.106964111328, 168.106964111328, 171.106964111328, 
    174.106964111328, 177.106964111328, 180.106964111328, 183.106964111328, 
    186.106964111328, 189.106964111328, 192.106964111328, 195.106964111328,
  // depth(2, 0-19)
    134.5859375, 137.5859375, 140.5859375, 143.5859375, 146.5859375, 
    149.5859375, 152.5859375, 155.5859375, 158.5859375, 161.5859375, 
    164.5859375, 167.5859375, 170.5859375, 173.5859375, 176.5859375, 
    179.5859375, 182.5859375, 185.5859375, 188.5859375, 191.5859375,
  // depth(3, 0-19)
    130.897232055664, 133.897232055664, 136.897232055664, 139.897232055664, 
    142.897232055664, 145.897232055664, 148.897232055664, 151.897232055664, 
    154.897232055664, 157.897232055664, 160.897232055664, 163.897232055664, 
    166.897232055664, 169.897232055664, 172.897232055664, 175.897232055664, 
    178.897232055664, 181.897232055664, 184.897232055664, 187.897232055664,
  // depth(4, 0-19)
    127.3203125, 130.3203125, 133.3203125, 136.3203125, 139.3203125, 
    142.3203125, 145.3203125, 148.3203125, 151.3203125, 154.3203125, 
    157.3203125, 160.3203125, 163.3203125, 166.3203125, 169.3203125, 
    172.3203125, 175.3203125, 178.3203125, 181.3203125, 184.3203125,
  // depth(5, 0-19)
    123.771347045898, 126.771347045898, 129.771347045898, 132.771347045898, 
    135.771347045898, 138.771347045898, 141.771347045898, 144.771347045898, 
    147.771347045898, 150.771347045898, 153.771347045898, 156.771347045898, 
    159.771347045898, 162.771347045898, 165.771347045898, 168.771347045898, 
    171.771347045898, 174.771347045898, 177.771347045898, 180.771347045898,
  // depth(6, 0-19)
    120.25032043457, 123.25032043457, 126.25032043457, 129.25032043457, 
    132.25032043457, 135.25032043457, 138.25032043457, 141.25032043457, 
    144.25032043457, 147.25032043457, 150.25032043457, 153.25032043457, 
    156.25032043457, 159.25032043457, 162.25032043457, 165.25032043457, 
    168.25032043457, 171.25032043457, 174.25032043457, 177.25032043457,
  // depth(7, 0-19)
    116.393951416016, 119.393951416016, 122.393951416016, 125.393951416016, 
    128.393951416016, 131.393951416016, 134.393951416016, 137.393951416016, 
    140.393951416016, 143.393951416016, 146.393951416016, 149.393951416016, 
    152.393951416016, 155.393951416016, 158.393951416016, 161.393951416016, 
    164.393951416016, 167.393951416016, 170.393951416016, 173.393951416016,
  // depth(8, 0-19)
    116.393951416016, 119.393951416016, 122.393951416016, 125.393951416016, 
    128.393951416016, 131.393951416016, 134.393951416016, 137.393951416016, 
    140.393951416016, 143.393951416016, 146.393951416016, 149.393951416016, 
    152.393951416016, 155.393951416016, 158.393951416016, 161.393951416016, 
    164.393951416016, 167.393951416016, 170.393951416016, 173.393951416016,
  // depth(9, 0-19)
    112.956756591797, 115.956756591797, 118.956756591797, 121.956756591797, 
    124.956756591797, 127.956756591797, 130.956756591797, 133.956756591797, 
    136.956756591797, 139.956756591797, 142.956756591797, 145.956756591797, 
    148.956756591797, 151.956756591797, 154.956756591797, 157.956756591797, 
    160.956756591797, 163.956756591797, 166.956756591797, 169.956756591797,
  // depth(10, 0-19)
    109.407775878906, 112.407775878906, 115.407775878906, 118.407775878906, 
    121.407775878906, 124.407775878906, 127.407775878906, 130.407775878906, 
    133.407775878906, 136.407775878906, 139.407775878906, 142.407775878906, 
    145.407775878906, 148.407775878906, 151.407775878906, 154.407775878906, 
    157.407775878906, 160.407775878906, 163.407775878906, 166.407775878906,
  // depth(11, 0-19)
    105.830856323242, 108.830856323242, 111.830856323242, 114.830856323242, 
    117.830856323242, 120.830856323242, 123.830856323242, 126.830856323242, 
    129.830856323242, 132.830856323242, 135.830856323242, 138.830856323242, 
    141.830856323242, 144.830856323242, 147.830856323242, 150.830856323242, 
    153.830856323242, 156.830856323242, 159.830856323242, 162.830856323242,
  // depth(12, 0-19)
    102.36572265625, 105.36572265625, 108.36572265625, 111.36572265625, 
    114.36572265625, 117.36572265625, 120.36572265625, 123.36572265625, 
    126.36572265625, 129.36572265625, 132.36572265625, 135.36572265625, 
    138.36572265625, 141.36572265625, 144.36572265625, 147.36572265625, 
    150.36572265625, 153.36572265625, 156.36572265625, 159.36572265625,
  // depth(13, 0-19)
    98.9564666748047, 101.956466674805, 104.956466674805, 107.956466674805, 
    110.956466674805, 113.956466674805, 116.956466674805, 119.956466674805, 
    122.956466674805, 125.956466674805, 128.956466674805, 131.956466674805, 
    134.956466674805, 137.956466674805, 140.956466674805, 143.956466674805, 
    146.956466674805, 149.956466674805, 152.956466674805, 155.956466674805,
  // depth(14, 0-19)
    95.2677764892578, 98.2677764892578, 101.267776489258, 104.267776489258, 
    107.267776489258, 110.267776489258, 113.267776489258, 116.267776489258, 
    119.267776489258, 122.267776489258, 125.267776489258, 128.267776489258, 
    131.267776489258, 134.267776489258, 137.267776489258, 140.267776489258, 
    143.267776489258, 146.267776489258, 149.267776489258, 152.267776489258,
  // depth(15, 0-19)
    91.7746887207031, 94.7746887207031, 97.7746887207031, 100.774688720703, 
    103.774688720703, 106.774688720703, 109.774688720703, 112.774688720703, 
    115.774688720703, 118.774688720703, 121.774688720703, 124.774688720703, 
    127.774688720703, 130.774688720703, 133.774688720703, 136.774688720703, 
    139.774688720703, 142.774688720703, 145.774688720703, 148.774688720703,
  // depth(16, 0-19)
    88.3933868408203, 91.3933868408203, 94.3933868408203, 97.3933868408203, 
    100.39338684082, 103.39338684082, 106.39338684082, 109.39338684082, 
    112.39338684082, 115.39338684082, 118.39338684082, 121.39338684082, 
    124.39338684082, 127.39338684082, 130.39338684082, 133.39338684082, 
    136.39338684082, 139.39338684082, 142.39338684082, 145.39338684082,
  // depth(17, 0-19)
    84.9282379150391, 87.9282379150391, 90.9282379150391, 93.9282379150391, 
    96.9282379150391, 99.9282379150391, 102.928237915039, 105.928237915039, 
    108.928237915039, 111.928237915039, 114.928237915039, 117.928237915039, 
    120.928237915039, 123.928237915039, 126.928237915039, 129.928237915039, 
    132.928237915039, 135.928237915039, 138.928237915039, 141.928237915039,
  // depth(18, 0-19)
    84.9282379150391, 87.9282379150391, 90.9282379150391, 93.9282379150391, 
    96.9282379150391, 99.9282379150391, 102.928237915039, 105.928237915039, 
    108.928237915039, 111.928237915039, 114.928237915039, 117.928237915039, 
    120.928237915039, 123.928237915039, 126.928237915039, 129.928237915039, 
    132.928237915039, 135.928237915039, 138.928237915039, 141.928237915039,
  // depth(19, 0-19)
    81.2395477294922, 84.2395477294922, 87.2395477294922, 90.2395477294922, 
    93.2395477294922, 96.2395477294922, 99.2395477294922, 102.239547729492, 
    105.239547729492, 108.239547729492, 111.239547729492, 114.239547729492, 
    117.239547729492, 120.239547729492, 123.239547729492, 126.239547729492, 
    129.239547729492, 132.239547729492, 135.239547729492, 138.239547729492,
  // depth(20, 0-19)
    77.718505859375, 80.718505859375, 83.718505859375, 86.718505859375, 
    89.718505859375, 92.718505859375, 95.718505859375, 98.718505859375, 
    101.718505859375, 104.718505859375, 107.718505859375, 110.718505859375, 
    113.718505859375, 116.718505859375, 119.718505859375, 122.718505859375, 
    125.718505859375, 128.718505859375, 131.718505859375, 134.718505859375,
  // depth(21, 0-19)
    74.4210357666016, 77.4210357666016, 80.4210357666016, 83.4210357666016, 
    86.4210357666016, 89.4210357666016, 92.4210357666016, 95.4210357666016, 
    98.4210357666016, 101.421035766602, 104.421035766602, 107.421035766602, 
    110.421035766602, 113.421035766602, 116.421035766602, 119.421035766602, 
    122.421035766602, 125.421035766602, 128.421035766602, 131.421035766602,
  // depth(22, 0-19)
    71.2632904052734, 74.2632904052734, 77.2632904052734, 80.2632904052734, 
    83.2632904052734, 86.2632904052734, 89.2632904052734, 92.2632904052734, 
    95.2632904052734, 98.2632904052734, 101.263290405273, 104.263290405273, 
    107.263290405273, 110.263290405273, 113.263290405273, 116.263290405273, 
    119.263290405273, 122.263290405273, 125.263290405273, 128.263290405273,
  // depth(23, 0-19)
    68.1055374145508, 71.1055374145508, 74.1055374145508, 77.1055374145508, 
    80.1055374145508, 83.1055374145508, 86.1055374145508, 89.1055374145508, 
    92.1055374145508, 95.1055374145508, 98.1055374145508, 101.105537414551, 
    104.105537414551, 107.105537414551, 110.105537414551, 113.105537414551, 
    116.105537414551, 119.105537414551, 122.105537414551, 125.105537414551,
  // depth(24, 0-19)
    64.7521820068359, 67.7521820068359, 70.7521820068359, 73.7521820068359, 
    76.7521820068359, 79.7521820068359, 82.7521820068359, 85.7521820068359, 
    88.7521820068359, 91.7521820068359, 94.7521820068359, 97.7521820068359, 
    100.752182006836, 103.752182006836, 106.752182006836, 109.752182006836, 
    112.752182006836, 115.752182006836, 118.752182006836, 121.752182006836,
  // depth(25, 0-19)
    61.5664825439453, 64.5664825439453, 67.5664825439453, 70.5664825439453, 
    73.5664825439453, 76.5664825439453, 79.5664825439453, 82.5664825439453, 
    85.5664825439453, 88.5664825439453, 91.5664825439453, 94.5664825439453, 
    97.5664825439453, 100.566482543945, 103.566482543945, 106.566482543945, 
    109.566482543945, 112.566482543945, 115.566482543945, 118.566482543945,
  // depth(26, 0-19)
    58.4087371826172, 61.4087371826172, 64.4087371826172, 67.4087371826172, 
    70.4087371826172, 73.4087371826172, 76.4087371826172, 79.4087371826172, 
    82.4087371826172, 85.4087371826172, 88.4087371826172, 91.4087371826172, 
    94.4087371826172, 97.4087371826172, 100.408737182617, 103.408737182617, 
    106.408737182617, 109.408737182617, 112.408737182617, 115.408737182617,
  // depth(27, 0-19)
    58.4087371826172, 61.4087371826172, 64.4087371826172, 67.4087371826172, 
    70.4087371826172, 73.4087371826172, 76.4087371826172, 79.4087371826172, 
    82.4087371826172, 85.4087371826172, 88.4087371826172, 91.4087371826172, 
    94.4087371826172, 97.4087371826172, 100.408737182617, 103.408737182617, 
    106.408737182617, 109.408737182617, 112.408737182617, 115.408737182617,
  // depth(28, 0-19)
    55.2789306640625, 58.2789306640625, 61.2789306640625, 64.2789306640625, 
    67.2789306640625, 70.2789306640625, 73.2789306640625, 76.2789306640625, 
    79.2789306640625, 82.2789306640625, 85.2789306640625, 88.2789306640625, 
    91.2789306640625, 94.2789306640625, 97.2789306640625, 100.278930664062, 
    103.278930664062, 106.278930664062, 109.278930664062, 112.278930664062,
  // depth(29, 0-19)
    52.1491317749023, 55.1491317749023, 58.1491317749023, 61.1491317749023, 
    64.1491317749023, 67.1491317749023, 70.1491317749023, 73.1491317749023, 
    76.1491317749023, 79.1491317749023, 82.1491317749023, 85.1491317749023, 
    88.1491317749023, 91.1491317749023, 94.1491317749023, 97.1491317749023, 
    100.149131774902, 103.149131774902, 106.149131774902, 109.149131774902,
  // depth(30, 0-19)
    49.2708282470703, 52.2708282470703, 55.2708282470703, 58.2708282470703, 
    61.2708282470703, 64.2708282470703, 67.2708282470703, 70.2708282470703, 
    73.2708282470703, 76.2708282470703, 79.2708282470703, 82.2708282470703, 
    85.2708282470703, 88.2708282470703, 91.2708282470703, 94.2708282470703, 
    97.2708282470703, 100.27082824707, 103.27082824707, 106.27082824707,
  // depth(31, 0-19)
    46.0571899414062, 49.0571899414062, 52.0571899414062, 55.0571899414062, 
    58.0571899414062, 61.0571899414062, 64.0571899414062, 67.0571899414062, 
    70.0571899414062, 73.0571899414062, 76.0571899414062, 79.0571899414062, 
    82.0571899414062, 85.0571899414062, 88.0571899414062, 91.0571899414062, 
    94.0571899414062, 97.0571899414062, 100.057189941406, 103.057189941406,
  // depth(32, 0-19)
    43.0950546264648, 46.0950546264648, 49.0950546264648, 52.0950546264648, 
    55.0950546264648, 58.0950546264648, 61.0950546264648, 64.0950546264648, 
    67.0950546264648, 70.0950546264648, 73.0950546264648, 76.0950546264648, 
    79.0950546264648, 82.0950546264648, 85.0950546264648, 88.0950546264648, 
    91.0950546264648, 94.0950546264648, 97.0950546264648, 100.095054626465,
  // depth(33, 0-19)
    39.7975769042969, 42.7975769042969, 45.7975769042969, 48.7975769042969, 
    51.7975769042969, 54.7975769042969, 57.7975769042969, 60.7975769042969, 
    63.7975769042969, 66.7975769042969, 69.7975769042969, 72.7975769042969, 
    75.7975769042969, 78.7975769042969, 81.7975769042969, 84.7975769042969, 
    87.7975769042969, 90.7975769042969, 93.7975769042969, 96.7975769042969,
  // depth(34, 0-19)
    36.6677780151367, 39.6677780151367, 42.6677780151367, 45.6677780151367, 
    48.6677780151367, 51.6677780151367, 54.6677780151367, 57.6677780151367, 
    60.6677780151367, 63.6677780151367, 66.6677780151367, 69.6677780151367, 
    72.6677780151367, 75.6677780151367, 78.6677780151367, 81.6677780151367, 
    84.6677780151367, 87.6677780151367, 90.6677780151367, 93.6677780151367,
  // depth(35, 0-19)
    33.56591796875, 36.56591796875, 39.56591796875, 42.56591796875, 
    45.56591796875, 48.56591796875, 51.56591796875, 54.56591796875, 
    57.56591796875, 60.56591796875, 63.56591796875, 66.56591796875, 
    69.56591796875, 72.56591796875, 75.56591796875, 78.56591796875, 
    81.56591796875, 84.56591796875, 87.56591796875, 90.56591796875,
  // depth(36, 0-19)
    33.56591796875, 36.56591796875, 39.56591796875, 42.56591796875, 
    45.56591796875, 48.56591796875, 51.56591796875, 54.56591796875, 
    57.56591796875, 60.56591796875, 63.56591796875, 66.56591796875, 
    69.56591796875, 72.56591796875, 75.56591796875, 78.56591796875, 
    81.56591796875, 84.56591796875, 87.56591796875, 90.56591796875,
  // depth(37, 0-19)
    30.29638671875, 33.29638671875, 36.29638671875, 39.29638671875, 
    42.29638671875, 45.29638671875, 48.29638671875, 51.29638671875, 
    54.29638671875, 57.29638671875, 60.29638671875, 63.29638671875, 
    66.29638671875, 69.29638671875, 72.29638671875, 75.29638671875, 
    78.29638671875, 81.29638671875, 84.29638671875, 87.29638671875,
  // depth(38, 0-19)
    27.2783660888672, 30.2783660888672, 33.2783660888672, 36.2783660888672, 
    39.2783660888672, 42.2783660888672, 45.2783660888672, 48.2783660888672, 
    51.2783660888672, 54.2783660888672, 57.2783660888672, 60.2783660888672, 
    63.2783660888672, 66.2783660888672, 69.2783660888672, 72.2783660888672, 
    75.2783660888672, 78.2783660888672, 81.2783660888672, 84.2783660888672,
  // depth(39, 0-19)
    24.2044448852539, 27.2044448852539, 30.2044448852539, 33.2044448852539, 
    36.2044448852539, 39.2044448852539, 42.2044448852539, 45.2044448852539, 
    48.2044448852539, 51.2044448852539, 54.2044448852539, 57.2044448852539, 
    60.2044448852539, 63.2044448852539, 66.2044448852539, 69.2044448852539, 
    72.2044448852539, 75.2044448852539, 78.2044448852539, 81.2044448852539,
  // depth(40, 0-19)
    21.3540878295898, 24.3540878295898, 27.3540878295898, 30.3540878295898, 
    33.3540878295898, 36.3540878295898, 39.3540878295898, 42.3540878295898, 
    45.3540878295898, 48.3540878295898, 51.3540878295898, 54.3540878295898, 
    57.3540878295898, 60.3540878295898, 63.3540878295898, 66.3540878295898, 
    69.3540878295898, 72.3540878295898, 75.3540878295898, 78.3540878295898,
  // depth(41, 0-19)
    18.2242889404297, 21.2242889404297, 24.2242889404297, 27.2242889404297, 
    30.2242889404297, 33.2242889404297, 36.2242889404297, 39.2242889404297, 
    42.2242889404297, 45.2242889404297, 48.2242889404297, 51.2242889404297, 
    54.2242889404297, 57.2242889404297, 60.2242889404297, 63.2242889404297, 
    66.2242889404297, 69.2242889404297, 72.2242889404297, 75.2242889404297,
  // depth(42, 0-19)
    15.122428894043, 18.122428894043, 21.122428894043, 24.122428894043, 
    27.122428894043, 30.122428894043, 33.122428894043, 36.122428894043, 
    39.122428894043, 42.122428894043, 45.122428894043, 48.122428894043, 
    51.122428894043, 54.122428894043, 57.122428894043, 60.122428894043, 
    63.122428894043, 66.122428894043, 69.122428894043, 72.122428894043,
  // depth(43, 0-19)
    11.824951171875, 14.824951171875, 17.824951171875, 20.824951171875, 
    23.824951171875, 26.824951171875, 29.824951171875, 32.824951171875, 
    35.824951171875, 38.824951171875, 41.824951171875, 44.824951171875, 
    47.824951171875, 50.824951171875, 53.824951171875, 56.824951171875, 
    59.824951171875, 62.824951171875, 65.824951171875, 68.824951171875,
  // depth(44, 0-19)
    8.55542755126953, 11.5554275512695, 14.5554275512695, 17.5554275512695, 
    20.5554275512695, 23.5554275512695, 26.5554275512695, 29.5554275512695, 
    32.5554275512695, 35.5554275512695, 38.5554275512695, 41.5554275512695, 
    44.5554275512695, 47.5554275512695, 50.5554275512695, 53.5554275512695, 
    56.5554275512695, 59.5554275512695, 62.5554275512695, 65.5554275512695,
  // depth(45, 0-19)
    8.55542755126953, 11.5554275512695, 14.5554275512695, 17.5554275512695, 
    20.5554275512695, 23.5554275512695, 26.5554275512695, 29.5554275512695, 
    32.5554275512695, 35.5554275512695, 38.5554275512695, 41.5554275512695, 
    44.5554275512695, 47.5554275512695, 50.5554275512695, 53.5554275512695, 
    56.5554275512695, 59.5554275512695, 62.5554275512695, 65.5554275512695,
  // depth(46, 0-19)
    5.53739929199219, 8.53739929199219, 11.5373992919922, 14.5373992919922, 
    17.5373992919922, 20.5373992919922, 23.5373992919922, 26.5373992919922, 
    29.5373992919922, 32.5373992919922, 35.5373992919922, 38.5373992919922, 
    41.5373992919922, 44.5373992919922, 47.5373992919922, 50.5373992919922, 
    53.5373992919922, 56.5373992919922, 59.5373992919922, 62.5373992919922,
  // depth(47, 0-19)
    2.26787185668945, 5.26787185668945, 8.26787185668945, 11.2678718566895, 
    14.2678718566895, 17.2678718566895, 20.2678718566895, 23.2678718566895, 
    26.2678718566895, 29.2678718566895, 32.2678718566895, 35.2678718566895, 
    38.2678718566895, 41.2678718566895, 44.2678718566895, 47.2678718566895, 
    50.2678718566895, 53.2678718566895, 56.2678718566895, 59.2678718566895,
  // depth(48, 0-19)
    2.27779388427734, 5.27779388427734, 8.27779388427734, 11.2777938842773, 
    14.2777938842773, 17.2777938842773, 20.2777938842773, 23.2777938842773, 
    26.2777938842773, 29.2777938842773, 32.2777938842773, 35.2777938842773, 
    38.2777938842773, 41.2777938842773, 44.2777938842773, 47.2777938842773, 
    50.2777938842773, 53.2777938842773, 56.2777938842773, _,
  // depth(49, 0-19)
    2.20387649536133, 5.20387649536133, 8.20387649536133, 11.2038764953613, 
    14.2038764953613, 17.2038764953613, 20.2038764953613, 23.2038764953613, 
    26.2038764953613, 29.2038764953613, 32.2038764953613, 35.2038764953613, 
    38.2038764953613, 41.2038764953613, 44.2038764953613, 47.2038764953613, 
    50.2038764953613, 53.2038764953613, _, _,
  // depth(50, 0-19)
    1.96229553222656, 4.96229553222656, 7.96229553222656, 10.9622955322266, 
    13.9622955322266, 16.9622955322266, 19.9622955322266, 22.9622955322266, 
    25.9622955322266, 28.9622955322266, 31.9622955322266, 34.9622955322266, 
    37.9622955322266, 40.9622955322266, 43.9622955322266, 46.9622955322266, 
    49.9622955322266, _, _, _,
  // depth(51, 0-19)
    1.88837814331055, 4.88837814331055, 7.88837814331055, 10.8883781433105, 
    13.8883781433105, 16.8883781433105, 19.8883781433105, 22.8883781433105, 
    25.8883781433105, 28.8883781433105, 31.8883781433105, 34.8883781433105, 
    37.8883781433105, 40.8883781433105, 43.8883781433105, 46.8883781433105, 
    _, _, _, _,
  // depth(52, 0-19)
    1.73062896728516, 4.73062896728516, 7.73062896728516, 10.7306289672852, 
    13.7306289672852, 16.7306289672852, 19.7306289672852, 22.7306289672852, 
    25.7306289672852, 28.7306289672852, 31.7306289672852, 34.7306289672852, 
    37.7306289672852, 40.7306289672852, 43.7306289672852, _, _, _, _, _,
  // depth(53, 0-19)
    1.79644012451172, 4.79644012451172, 7.79644012451172, 10.7964401245117, 
    13.7964401245117, 16.7964401245117, 19.7964401245117, 22.7964401245117, 
    25.7964401245117, 28.7964401245117, 31.7964401245117, 34.7964401245117, 
    37.7964401245117, 40.7964401245117, _, _, _, _, _, _,
  // depth(54, 0-19)
    1.79644012451172, 4.79644012451172, 7.79644012451172, 10.7964401245117, 
    13.7964401245117, 16.7964401245117, 19.7964401245117, 22.7964401245117, 
    25.7964401245117, 28.7964401245117, 31.7964401245117, 34.7964401245117, 
    37.7964401245117, 40.7964401245117, _, _, _, _, _, _,
  // depth(55, 0-19)
    1.55485534667969, 4.55485534667969, 7.55485534667969, 10.5548553466797, 
    13.5548553466797, 16.5548553466797, 19.5548553466797, 22.5548553466797, 
    25.5548553466797, 28.5548553466797, 31.5548553466797, 34.5548553466797, 
    37.5548553466797, _, _, _, _, _, _, _,
  // depth(56, 0-19)
    1.62066650390625, 4.62066650390625, 7.62066650390625, 10.6206665039062, 
    13.6206665039062, 16.6206665039062, 19.6206665039062, 22.6206665039062, 
    25.6206665039062, 28.6206665039062, 31.6206665039062, 34.6206665039062, 
    _, _, _, _, _, _, _, _,
  // depth(57, 0-19)
    1.40702629089355, 4.40702629089355, 7.40702629089355, 10.4070262908936, 
    13.4070262908936, 16.4070262908936, 19.4070262908936, 22.4070262908936, 
    25.4070262908936, 28.4070262908936, 31.4070262908936, _, _, _, _, _, _, 
    _, _, _,
  // depth(58, 0-19)
    1.50078010559082, 4.50078010559082, 7.50078010559082, 10.5007801055908, 
    13.5007801055908, 16.5007801055908, 19.5007801055908, 22.5007801055908, 
    25.5007801055908, 28.5007801055908, _, _, _, _, _, _, _, _, _, _,
  // depth(59, 0-19)
    1.45480918884277, 4.45480918884277, 7.45480918884277, 10.4548091888428, 
    13.4548091888428, 16.4548091888428, 19.4548091888428, 22.4548091888428, 
    25.4548091888428, _, _, _, _, _, _, _, _, _, _, _,
  // depth(60, 0-19)
    1.5206184387207, 4.5206184387207, 7.5206184387207, 10.5206184387207, 
    13.5206184387207, 16.5206184387207, 19.5206184387207, 22.5206184387207, 
    _, _, _, _, _, _, _, _, _, _, _, _,
  // depth(61, 0-19)
    1.6423168182373, 4.6423168182373, 7.6423168182373, 10.6423168182373, 
    13.6423168182373, 16.6423168182373, 19.6423168182373, _, _, _, _, _, _, 
    _, _, _, _, _, _, _,
  // depth(62, 0-19)
    1.62429046630859, 4.62429046630859, 7.62429046630859, 10.6242904663086, 
    13.6242904663086, 16.6242904663086, _, _, _, _, _, _, _, _, _, _, _, _, 
    _, _,
  // depth(63, 0-19)
    1.62429046630859, 4.62429046630859, 7.62429046630859, 10.6242904663086, 
    13.6242904663086, 16.6242904663086, _, _, _, _, _, _, _, _, _, _, _, _, 
    _, _,
  // depth(64, 0-19)
    1.52243137359619, 4.52243137359619, 7.52243137359619, 10.5224313735962, 
    13.5224313735962, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
  // depth(65, 0-19)
    1.67207336425781, 4.67207336425781, 7.67207336425781, 10.6720733642578, 
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _ ;

 echogram_sv =
  // echogram_sv(0, 0-19)
    -31, -31, -31, -31, -31, -31, -31, -31, -31, -31, -31, -31, -31, -31, 
    -31, -31, -31, -31, -31, -31,
  // echogram_sv(1, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(2, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(3, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(4, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(5, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(6, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(7, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(8, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(9, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(10, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -67, -73, -73,
  // echogram_sv(11, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(12, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -67, -67, -73,
  // echogram_sv(13, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -67, -61, -73,
  // echogram_sv(14, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -61, -67, -73,
  // echogram_sv(15, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -61, -67, -73,
  // echogram_sv(16, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -55, -61, -61, -73,
  // echogram_sv(17, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -67, -61, -61, -73,
  // echogram_sv(18, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -61, -67, -61,
  // echogram_sv(19, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -61, -67, -61,
  // echogram_sv(20, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -67, -61,
  // echogram_sv(21, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -67, -73, -67,
  // echogram_sv(22, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -61,
  // echogram_sv(23, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(24, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(25, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(26, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(27, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(28, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(29, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(30, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(31, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(32, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(33, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(34, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(35, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(36, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(37, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(38, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(39, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(40, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(41, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(42, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(43, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(44, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(45, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(46, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(47, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, -73,
  // echogram_sv(48, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, -73, _,
  // echogram_sv(49, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, -73, _, _,
  // echogram_sv(50, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, -73, _, _, _,
  // echogram_sv(51, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, -73, _, _, _, _,
  // echogram_sv(52, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, 
    -73, _, _, _, _, _,
  // echogram_sv(53, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, _, 
    _, _, _, _, _,
  // echogram_sv(54, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, _, 
    _, _, _, _, _,
  // echogram_sv(55, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, _, _, _, 
    _, _, _, _,
  // echogram_sv(56, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, _, _, _, _, 
    _, _, _, _,
  // echogram_sv(57, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, _, _, _, _, _, _, 
    _, _, _,
  // echogram_sv(58, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, -73, _, _, _, _, _, _, _, _, 
    _, _,
  // echogram_sv(59, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, -73, _, _, _, _, _, _, _, _, _, 
    _, _,
  // echogram_sv(60, 0-19)
    -73, -73, -73, -73, -73, -73, -73, -73, _, _, _, _, _, _, _, _, _, _, _, _,
  // echogram_sv(61, 0-19)
    -73, -73, -73, -73, -73, -73, -73, _, _, _, _, _, _, _, _, _, _, _, _, _,
  // echogram_sv(62, 0-19)
    -73, -73, -73, -73, -73, -73, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
  // echogram_sv(63, 0-19)
    -73, -73, -73, -73, -73, -73, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
  // echogram_sv(64, 0-19)
    -73, -55, -61, -73, -73, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
  // echogram_sv(65, 0-19)
    -67, -31, -73, -73, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _ ;

 lat = 59.8421046403177, 59.8419970771558, 59.8419375741301, 
    59.8418986683056, 59.8418506081694, 59.8418071251891, 59.8417636422088, 
    59.8417224478064, 59.8416766762481, 59.8416354818457, 59.8415919988654, 
    59.8415508044629, 59.8415050329047, 59.8414615499244, 59.841418066944, 
    59.8413768725416, 59.8413311009834, 59.841287618003, 59.8412487121785, 
    59.8412029406203, 59.8411594576399, 59.8411159746596, 59.8410747802572, 
    59.8410312972768, 59.8409878142965, 59.8409420427383, 59.8409008483359, 
    59.8408596539334, 59.8408138823752, 59.8407703993949, 59.8407292049924, 
    59.8406857220121, 59.8406422390318, 59.8405964674735, 59.8405552730711, 
    59.8405117900908, 59.8404683071104, 59.8404248241301, 59.8403813411498, 
    59.8403401467474, 59.8402989523449, 59.8402508922088, 59.8402096978064, 
    59.840166214826, 59.8401227318457, 59.8400792488654, 59.840035765885, 
    59.8399922829047, 59.8399510885023, 59.8399098940998, 59.8398618339637, 
    59.8398206395613, 59.8397771565809, 59.8397359621785, 59.8396901906203, 
    59.8396467076399, 59.8396055132375, 59.8395620302572, 59.8395208358548, 
    59.8394750642965, 59.8394315813162, 59.8393880983359, 59.8393469039334, 
    59.8393011323752, 59.8392576493949, 59.8392164549924 ;

 lon = -149.475288063162, -149.475348910741, -149.475382571104, 
    -149.475404579803, -149.47543176702, -149.475456364977, 
    -149.475480962935, -149.475504266263, -149.47553015885, 
    -149.475553462179, -149.475578060136, -149.475601363464, 
    -149.475627256051, -149.475651854009, -149.475676451967, 
    -149.475699755295, -149.475725647882, -149.47575024584, 
    -149.475772254539, -149.475798147126, -149.475822745083, 
    -149.475847343041, -149.475870646369, -149.475895244327, 
    -149.475919842284, -149.475945734871, -149.4759690382, -149.475992341528, 
    -149.476018234115, -149.476042832073, -149.476066135401, 
    -149.476090733359, -149.476115331316, -149.476141223903, 
    -149.476164527231, -149.476189125189, -149.476213723147, 
    -149.476238321104, -149.476262919062, -149.47628622239, 
    -149.476309525719, -149.476336712935, -149.476360016263, 
    -149.476384614221, -149.476409212179, -149.476433810136, 
    -149.476458408094, -149.476483006051, -149.47650630938, 
    -149.476529612708, -149.476556799924, -149.476580103253, 
    -149.47660470121, -149.476628004539, -149.476653897126, 
    -149.476678495083, -149.476701798411, -149.476726396369, 
    -149.476749699697, -149.476775592284, -149.476800190242, -149.4768247882, 
    -149.476848091528, -149.476873984115, -149.476898582073, -149.476921885401 ;

 lat_uv = _ ;

 lon_uv = _ ;

 time_uv = _ ;

 profile_id = 1710362769 ;

 profile_lat = 59.840776394132 ;

 profile_lon = -149.4760394409 ;

 profile_time = 1079211350.06525 ;

 u = _ ;

 v = _ ;

 platform = _ ;

 instrument_ctd = _ ;

 trajectory = "unit_507-20240304T0000" ;
}

Rendering in ERDDAP:

unit_507_20240304T0000_acoustic_OG

@jcermauwedu
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A somewhat ugly solution has been found avoiding use of netCDF4 groups. This avoids causing the CTD like data to become very sparse when adding N_BINS to a shared depth variable. In this example, two sets of dimensions are created and seem to work well within ERDDAP. A similar principle can be applied to support OG-1.0 format. See: https://hoodfish.fish.washington.edu/erddap/files/unit_507_20240304T0000_CF2/

The typical CTD parameters continue to use time, lat, lon, depth as their shared dimensions. The echogram now has its own dimensions: echogram_sv(echogram_time, echogram_depth). To make the dimensions more generic for other related acoustic variable, the dimensions might be acoustic_time and acoustic_depth.

The next attempt is to try and clean this up leveraging netCDF4 groups (#119). Keeping the typical CTD structured data in the [root] group and creating an [acoustics] group.

@jcermauwedu
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Adding for reference to some sample files:

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