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  <attribute name="date_created" value="2026-03-22T01:08:01Z" />
  <attribute name="date_issued" value="2026-03-22T01:08:01Z" />
  <attribute name="date_modified" value="2026-04-21T05:09:08Z" />
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  <attribute name="institution" value="Scripps Institution of Oceanography, University of California San Diego" />
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  <attribute name="uuid" value="64191F0D-7D89-4D6A-96E3-A011EE835188" />
  <attribute name="title" value="Zero-crossing wave records derived from sea surface displacement values collected in situ by Datawell DWR-M4 directional buoy located near SAN FRANCISCO BAR, CA from 2026/03/21 23:57:52 to 2026/03/22 00:12:48." />
  <attribute name="summary" value="Zero-crossing wave records derived from sea surface displacement values collected in situ by Datawell DWR-M4 directional buoy located near SAN FRANCISCO BAR, CA from 2026/03/21 23:57:52 to 2026/03/22 00:12:48. Continuous displacement records were sampled at 2.560Hz in a water depth of approximately 15 meters." />
  <attribute name="keywords" value="EARTH SCIENCE, OCEANS, OCEAN WAVES, GRAVITY WAVES, WIND WAVES, OCEAN, PACIFIC OCEAN, EASTERN PACIFIC OCEAN" />
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  <attribute name="platform_id" value="142p1" />
  <attribute name="cdip_deployment_id" value="142p1_d29" />
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  <attribute name="wmo_platform_code" value="46237" />
  <attribute name="id" value="CDIP_142p1_20260321-20260322_zc" />
  <attribute name="comment" value="Zero-crossing analysis performed by CDIP on standard Datawell surface displacement data." />
  <attribute name="acknowledgment" value="CDIP is primarily supported by the U.S. Army Corps of Engineers (USACE). Field operator: CDIP" />
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  <attribute name="contributor_name" value="CDIP, USACE" />
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  <attribute name="geospatial_vertical_units" value="meters" />
  <attribute name="geospatial_vertical_origin" value="sea surface" />
  <attribute name="geospatial_vertical_positive" value="up" />
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  <attribute name="time_coverage_start" value="2026-03-21T23:57:52Z" />
  <attribute name="time_coverage_end" value="2026-04-21T04:27:47Z" />
  <attribute name="time_coverage_resolution" value="PT0.39S" />
  <attribute name="source" value="insitu observations" />
  <attribute name="instrument" value="metaInstrumentation" />
  <attribute name="platform" value="wave_buoy" />
  <attribute name="platform_vocabulary" value="http://mmisw.org/ont/ioos/platform" />
  <attribute name="platform_name" value="SAN FRANCISCO BAR, CA BUOY - 142p1" />
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  <group name="CFMetadata">
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    <attribute name="geospatial_lat_max" value="37.788" type="float" />
    <attribute name="geospatial_lon_units" value="degrees_east" />
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    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="45.0" />
    <attribute name="time_coverage_duration" value="P0Y0M30DT4H29M54.897S" />
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  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-05-09" />
    <attribute name="nciso_version" value="2.4.8" />
  </group>
  <variable name="zcrossTimeBounds" shape="zcrossTime metaBoundsCount" type="double">
    <attribute name="long_name" value="time cell bounds" />
    <attribute name="units" value="milliseconds since 1970-01-01 00:00:00 UTC" />
    <attribute name="calendar" value="standard" />
    <attribute name="coverage_content_type" value="auxiliaryInformation" />
    <attribute name="_ChunkSizes" type="uint" value="1 2" />
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    <attribute name="long_name" value="primary zero-crossing QC flag" />
    <attribute name="_FillValue" type="byte" value="-127" />
    <attribute name="standard_name" value="status_flag" />
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    <attribute name="valid_max" type="byte" value="9" />
    <attribute name="flag_values" type="byte" value="1 2 3 4 9" />
    <attribute name="flag_meanings" value="good not_evaluated questionable bad missing" />
    <attribute name="reference" value="Ocean Data Standards, UNESCO 2013 - IOC Manuals and Guides, 54, Volume 3 Version 1" />
    <attribute name="ancillary_variables" value="zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="qualityInformation" />
    <attribute name="_ChunkSizes" type="uint" value="4096" />
  </variable>
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    <attribute name="long_name" value="secondary QC flag" />
    <attribute name="_FillValue" type="byte" value="-127" />
    <attribute name="valid_min" type="byte" value="0" />
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    <attribute name="flag_values" type="byte" value="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18" />
    <attribute name="flag_meanings" value="unspecified sensor_issues gaps_present period_out_of_range height_out_of_range horiz_motion_out_of_range consecutive_values max_accel_exceeded too_few_waves_in_window windowed_height_low height_spike period_spike excessive_horiz_motion peak_to_h3_ratio_bad rogue_bad_direction rogue_warning rogue_limit_exceeded in_filter_window_of_bad_value dwtp_nan_present" />
    <attribute name="reference" value="http://cdip.ucsd.edu/documentation" />
    <attribute name="coverage_content_type" value="qualityInformation" />
    <attribute name="_ChunkSizes" type="uint" value="4096" />
  </variable>
  <variable name="zcrossZPeak" shape="zcrossTime" type="float">
    <attribute name="long_name" value="trough/crest displacement" />
    <attribute name="units" value="m" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="20.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossXValue" shape="zcrossTime" type="float">
    <attribute name="long_name" value="N/S displacement at zero-crossing" />
    <attribute name="units" value="m" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
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    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossYValue" shape="zcrossTime" type="float">
    <attribute name="long_name" value="W/E displacement at zero-crossing" />
    <attribute name="units" value="m" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="20.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossHorizontalMax" shape="zcrossTime" type="float">
    <attribute name="long_name" value="maximum horizontal displacement" />
    <attribute name="units" value="m" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="20.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossMaxAccel" shape="zcrossTime" type="float">
    <attribute name="long_name" value="zero-cross maximum surface acceleration" />
    <attribute name="units" value="m/s^2" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="9.8" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossHeight" shape="zcrossTime" type="float">
    <attribute name="long_name" value="zero-cross wave height" />
    <attribute name="units" value="m" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="40.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="comment" value="Calculated for one full upcross or downcross wave in combination with the following zero-crossing." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossPeriod" shape="zcrossTime" type="float">
    <attribute name="long_name" value="zero-cross wave period" />
    <attribute name="units" value="s" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="40.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="comment" value="Calculated for one full upcross or downcross wave in combination with the following zero-crossing." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossDirection" shape="zcrossTime" type="float">
    <attribute name="long_name" value="zero-cross wave direction" />
    <attribute name="units" value="degreeT" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="360.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="comment" value="Calculated for one full upcross or downcross wave in combination with the following zero-crossing." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossHeightMean" shape="zcrossTime" type="float">
    <attribute name="long_name" value="windowed zero-cross wave height mean" />
    <attribute name="units" value="m" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="standard_name" value="sea_surface_wave_mean_height" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="20.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="comment" value="Calculated from all waves passing single-record QC in a window extending 900 seconds or 500 zero-crossings before and after zcrossTime." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossPeriodMean" shape="zcrossTime" type="float">
    <attribute name="long_name" value="windowed zero-cross wave period mean" />
    <attribute name="units" value="s" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="standard_name" value="sea_surface_wave_mean_period" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="30.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="comment" value="Calculated from all waves passing single-record QC in a window extending 900 seconds or 500 zero-crossings before and after zcrossTime." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossHeightStdDev" shape="zcrossTime" type="float">
    <attribute name="long_name" value="windowed zero-cross wave height stddev" />
    <attribute name="units" value="m" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="10.0" />
    <attribute name="coverage_content_type" value="auxiliaryInformation" />
    <attribute name="comment" value="Calculated from all waves passing single-record QC in a window extending 900 seconds or 500 zero-crossings before and after zcrossTime." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossPeriodStdDev" shape="zcrossTime" type="float">
    <attribute name="long_name" value="windowed zero-cross wave period stddev" />
    <attribute name="units" value="s" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="15.0" />
    <attribute name="coverage_content_type" value="auxiliaryInformation" />
    <attribute name="comment" value="Calculated from all waves passing single-record QC in a window extending 900 seconds or 500 zero-crossings before and after zcrossTime." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossHThird" shape="zcrossTime" type="float">
    <attribute name="long_name" value="windowed significant wave height" />
    <attribute name="units" value="m" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="standard_name" value="sea_surface_wave_significant_height" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="20.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="comment" value="Calculated from all waves passing single-record QC in a window extending 900 seconds or 500 zero-crossings before and after zcrossTime." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossTThird" shape="zcrossTime" type="float">
    <attribute name="long_name" value="windowed significant wave period" />
    <attribute name="units" value="s" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="standard_name" value="sea_surface_wave_significant_period" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="20.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="comment" value="Calculated from all waves passing single-record QC in a window extending 900 seconds or 500 zero-crossings before and after zcrossTime." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossDThird" shape="zcrossTime" type="float">
    <attribute name="long_name" value="windowed significant mean wave direction" />
    <attribute name="units" value="degreeT" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="standard_name" value="sea_surface_wave_from_direction" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="360.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="comment" value="Calculated from all waves passing single-record QC in a window extending 900 seconds or 500 zero-crossings before and after zcrossTime." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="zcrossHTenth" shape="zcrossTime" type="float">
    <attribute name="long_name" value="windowed H1/10 wave height" />
    <attribute name="units" value="m" />
    <attribute name="_FillValue" type="float" value="-999.99" />
    <attribute name="standard_name" value="sea_surface_wave_mean_height_of_highest_tenth" />
    <attribute name="coordinates" value="metaDeployLatitude metaDeployLongitude" />
    <attribute name="grid_mapping" value="metaGridMapping" />
    <attribute name="valid_min" type="float" value="0.0" />
    <attribute name="valid_max" type="float" value="20.0" />
    <attribute name="ancillary_variables" value="zcrossFlagPrimary zcrossFlagSecondary" />
    <attribute name="coverage_content_type" value="physicalMeasurement" />
    <attribute name="comment" value="Calculated from all waves passing single-record QC in a window extending 900 seconds or 500 zero-crossings before and after zcrossTime." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="indexStartTime" shape="" type="int">
    <attribute name="comment" value="The first zcrossTime record starting on or after timestamp TS is indexKey[TS-indexStartTime+1], with indexKey and zcrossTime indices starting from 1." />
    <attribute name="long_name" value="zcrossTime index start timestamp" />
    <attribute name="name" value="index start time" />
    <attribute name="units" value="seconds since 1970-01-01 00:00:00 UTC" />
  </variable>
  <variable name="indexKey" shape="indexCount" type="int">
    <attribute name="long_name" value="zcrossTime record keys at one-second resolution" />
    <attribute name="name" value="zcrossTime record key" />
    <attribute name="comment" value="The first zcrossTime record starting on or after timestamp TS is indexKey[TS-indexStartTime+1], with indexKey and zcrossTime indices starting from 1." />
    <attribute name="_ChunkSizes" type="uint" value="1024" />
  </variable>
  <variable name="metaStationName" shape="metaStationNameLength" type="char">
    <attribute name="long_name" value="station name" />
    <attribute name="standard_name" value="platform_name" />
    <attribute name="cf_role" value="timeseries_id" />
    <attribute name="coverage_content_type" value="referenceInformation" />
  </variable>
  <variable name="metaPlatform" shape="" type="char">
    <attribute name="long_name" value="platform_attributes" />
    <attribute name="make_model" value="Datawell DWR-M4 directional buoy" />
    <attribute name="serial_number" value="Hull: 74241; hatchcover: 74210" />
    <attribute name="hull_diameter_meters" type="float" value="0.9" />
    <attribute name="documentation_url" value="http://datawell.nl" />
    <attribute name="mooring" value="Datawell-compliant" />
    <attribute name="mooring_length_meters" type="float" value="55.0" />
    <attribute name="coverage_content_type" value="referenceInformation" />
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  <variable name="metaInstrumentation" shape="" type="char">
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