{
  "Spase": {
    "xmlns": "http://www.spase-group.org/data/schema",
    "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
    "xsi:schemaLocation": "http://www.spase-group.org/data/schema http://www.spase-group.org/data/schema/spase-2_6_1.xsd",
    "_Note": "Nodes prefixed with a _ are not valid SPASE, but are included for debugging. Values prefixed with a x_ are not valid SPASE but may considered for addition for completeness.",
    "Version": "2.6.1",
    "_MasterURL": "https://cdaweb.gsfc.nasa.gov/pub/software/cdawlib/0JSONS/i2_av_syo_00000000_v01.json (from all.xml)",
    "NumericalData": {
      "ResourceID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/SyowaBase/PT22S",
      "_ResourceID": "Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ResourceID.json",
      "ResourceHeader": {
        "ResourceName": "ISIS-2 Topside Sounder Ionogram over Syowa Base, Antartica (lat/lon=-69/40)",
        "_ResourceName": "Source: Master/CDFglobalAttributes/Logical_source_description",
        "AlternateName": "I2_AV_SYO",
        "_AlternateName": "Source: Master/CDFglobalAttributes/Logical_source",
        "Description": "A 7-track ISIS 2 analog telemetry tape from Ottawa (#561) has been digitized using the GSFC facilities of the Data Evaluation Laboratory (DEL) within the Mission Operations and Data Systems Directorate (Code 500) at Goddard.  The digitization was performed using an A/D converter board and software device driver compatible with the OS/2 operating system used by the 486-based Programmable Telemetry Processor (PTP) associated software has been installed on their PTP and de-bugged so that we now have a working system for making digital ISIS ionograms directly from the telemetry tapes.  Earlier, we successfully digitized the PCM and NASA 36 bit time-code data from this same tape. The ionograms were digitized at the rate of 40,000 16-bit samples/sec. This sample rate is higher than the Nyquist frequency of 30 kHz appropriate for the post-detection ISIS 2 sounder-receiver video output which extends from DC to 15 kHz (see p. 50 of the 1971 ISIS 2 report by Daniels).  The sample frequency of 40 kHz provides a measurement every 25 microseconds corresponding to an apparent range (ct/2) interval of 3.747 km.  With the ISIS 2 prf of 45 sounder pulses/s, there are (1/45)/(2.5**(-5)) = 888.89 samples between each of the approximately 1015 sounder pulses per ionogram (including the fixed-frequency portion) or nearly 10**6 16-bit samples/ionogram (approximately 1.8 MBytes) for just the sounder-receiver video data. Adding header information, and the pcm data containing data from the other instruments, yields about 2 MBytes of data for the 22.5 s period corresponding to one ionogram. Two steps were taken in order to reduce this large volume of nearly 2 MBytes/ionogram.  First, every four 25 microsecond samples following the sounder pulse were averaged.  Second, the 16 bit samples were reduced to 8 bit samples.  The first step decreased the apparent-range resolution to 15 km, but yielded high-quality ionograms because of the improved S/N due to the averaging. ",
        "_Description": "Source: Master/CDFglobalAttributes/TEXT",
        "_Rights": {
          "Name": "SPDX",
          "Description": "Creative Commons Zero v1.0 Universal",
          "URL": "https://spdx.org/licenses/CC0-1.0.html",
          "SchemeURI": "https://spdx.org/licenses/"
        },
        "InformationURL": [
          {
            "Name": "ISIS/Alouette Topside Sounder Data Restoration Project Site",
            "URL": "https://spdf.gsfc.nasa.gov/isis/isis-status.html",
            "Description": "ISIS/Alouette Page maintained by NASA GSFC with Science and Instrument Descriptions, Data Access, Software, and Publication Lists",
            "_Note": "URL also in all.xml, master. Using InformationURL.json."
          },
          {
            "Name": "NSSDC Master Catalog",
            "URL": "https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1969-009A",
            "Description": "Information about the Swept Frequency Sounder, SFS, Experiment on ISIS 1",
            "_Note": "Source: InformationURL.json"
          }
        ]
      },
      "ProviderResourceName": "Topside Sounder Ionogram",
      "DOI": null,
      "_DOI": "Source: https://github.com/rweigel/cdawmeta-spase/blob/main/DOI.json",
      "AccessInformation": [
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: R.F. Benson at NASA GSFC",
          "Format": [
            "CDF"
          ],
          "Style": "Listing",
          "AccessURL": {
            "Name": "HTTPS from SPDF",
            "URL": "https://cdaweb.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SYO_69S_040E",
            "Description": "In CDF via HTTP from CDAWeb",
            "AccessFilenameTemplate": "i2_av_syo_%Y%j%H%M%S_%Q.cdf",
            "AccessDirectoryTemplate": "%Y/%j",
            "ProductKey": "I2_AV_SYO"
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: R.F. Benson at NASA GSFC",
          "Format": [
            "CDF"
          ],
          "Style": "Listing",
          "AccessURL": {
            "Name": "FTPS from SPDF",
            "URL": "ftps://cdaweb.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SYO_69S_040E",
            "Description": "In CDF via HTTP from CDAWeb",
            "AccessFilenameTemplate": "i2_av_syo_%Y%j%H%M%S_%Q.cdf",
            "AccessDirectoryTemplate": "%Y/%j",
            "ProductKey": "I2_AV_SYO"
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: R.F. Benson at NASA GSFC",
          "Format": [
            "CDF",
            "CSV",
            "GIF",
            "NetCDF",
            "PNG",
            "PS",
            "PDF",
            "XML",
            "x_Script.IDL",
            "x_Script.Python",
            "Text.ASCII",
            "x_WAV"
          ],
          "AccessURL": {
            "Name": "CDAWeb Web Service",
            "URL": "https://cdaweb.gsfc.nasa.gov/WebServices/",
            "Style": "WebService",
            "Description": "Instructions for using web services to access this dataset an other other metadata and options for CDAWeb datasets. The ProductKey here corresponds to the query parameter 'dataset' in the tables at the AccessURL in a dataset-related request can be made.",
            "ProductKey": "I2_AV_SYO"
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: R.F. Benson at NASA GSFC",
          "Format": [
            "CDF",
            "GIF",
            "PDF",
            "Text.ASCII",
            "x_WAV"
          ],
          "AccessURL": {
            "Name": "CDAWeb Web Service user interface",
            "URL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?index=sp_phys&dataset=I2_AV_SYO",
            "Style": "WebService",
            "ProductKey": "I2_AV_SYO",
            "Description": "Web service user interface for this product."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: R.F. Benson at NASA GSFC",
          "Format": [
            "x_Script.IDL",
            "x_Script.Python"
          ],
          "AccessURL": {
            "Name": "CDAWeb Python Script",
            "URL": "https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/I2_AV_SYO/clientLibraryExample/",
            "ProductKey": "I2_AV_SYO",
            "Style": "WebService",
            "Description": "Web service that generates a Python script to access this product."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/SSCWeb. Please also acknowledge the data producer: R.F. Benson at NASA GSFC",
          "Format": [
            "HTML"
          ],
          "AccessURL": {
            "Name": "4D Orbit Viewer",
            "URL": "https://sscweb.gsfc.nasa.gov/4dorbit/?sc=I2_AV_SYO",
            "ProductKey": "I2_AV_SYO",
            "Style": "x_Visualization",
            "Description": "Web Service to this product."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: R.F. Benson at NASA GSFC",
          "Format": [
            "CSV",
            "JSON",
            "Binary"
          ],
          "AccessURL": {
            "Name": "CDAWeb HAPI Server",
            "URL": "https://hapi-server.org/servers/#server=CDAWeb&dataset=I2_AV_SYO",
            "Style": "HAPI",
            "ProductKey": "I2_AV_SYO",
            "Description": "Web Service to this product using the HAPI interface."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: R.F. Benson at NASA GSFC",
          "Format": [
            "x_Script.IDL",
            "x_Script.Javascript",
            "x_Script.MATLAB",
            "x_Script.Python",
            "x_Script.Autoplot",
            "x_Script.curl",
            "x_Script.wget"
          ],
          "AccessURL": {
            "Name": "CDAWeb HAPI Script in Multiple Languages",
            "URL": "https://hapi-server.org/servers/#server=CDAWeb&dataset=I2_AV_SYO&return=script",
            "Style": "HAPI",
            "ProductKey": "I2_AV_SYO",
            "Description": "Web Service user interface that generates scripts in IDL, Javascript, MATLAB, Python, Autoplot, curl, wget to access this product. See https://hapi-server.org/servers/api for the API."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: R.F. Benson at NASA GSFC",
          "Format": [
            "PNG",
            "PDF",
            "SVG"
          ],
          "AccessURL": {
            "Name": "HAPI visualizations",
            "URL": "https://hapi-server.org/plot/?server=https://cdaweb.gsfc.nasa.gov/hapi&dataset=I2_AV_SYO&format=gallery",
            "Style": "x_Visualization",
            "ProductKey": "I2_AV_SYO",
            "Description": "Web Service that generates plots. See https://hapi-server.org/plot/ for the API."
          }
        }
      ],
      "_AccessInformation": "Source: https://github.com/rweigel/cdawmeta-spase/blob/main/AccessInformation.json",
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "1973-02-03T05:49:37Z",
          "StopDate": "1983-01-13T11:06:43Z"
        },
        "_TemporalDescription": "Generated from all.xml/@timerange_start and all.xml/@timerange_stop",
        "Cadence": "PT0.022S",
        "_Cadence": "Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/isis/ionogram_cdf/isis2/SYO_69S_040E/1973/034/i2_av_syo_1973034054937_v01.cdf. The most common cadence, 22 [ms] = PT0.022S, occurred for 50.9137% of the 1003 timesteps. "
      },
      "Keyword": [
        "International Satellite for Ionosphere Studies 2 (from all.xml/observatory/description/@short)",
        "Syowa (from all.xml/instrument/description/@short)",
        "Space Physics (from Master/CDFglobalAttributes/Discipline)",
        "Ionospheric Science (from Master/CDFglobalAttributes/Discipline)",
        "ISIS-2 (from Master/CDFglobalAttributes/Source_name)",
        "International Satellite for Ionosphere Studies 2 (from Master/CDFglobalAttributes/Source_name)",
        "AV (from Master/CDFglobalAttributes/Data_type)",
        "Average Ionogram (from Master/CDFglobalAttributes/Data_type)",
        "SYO (from all.xml/instrument/@ID)"
      ],
      "ObservedRegion": [
        "Earth.NearSurface.Ionosphere",
        "Earth.Magnetosphere",
        "Earth.NearSurface.AuroralRegion",
        "Earth.NearSurface.EquatorialRegion",
        "Earth.NearSurface.Ionosphere.Topside",
        "Earth.Magnetosphere.Polar",
        "Earth.NearSurface.PolarCap",
        "Earth.NearSurface"
      ],
      "_ObservedRegion": "Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ObservedRegion.json",
      "ProcessingLevel": null,
      "_ProcessingLevel": "Processing level is not available in the master file; it should be there instead of, say, https://github.com/rweigel/cdawmeta-spase/blob/main/ProcessingLevel.json",
      "InstrumentID": "spase://SMWG/Instrument/ISIS2/SFS",
      "MeasurementType": [
        "Spectrum",
        "Waves.Active"
      ],
      "Parameter2": [
        {
          "Name": "Time",
          "ParameterKey": "Epoch",
          "Description": "CATDESC: 'Time'. Notes not in Master CDF: 'The units are the units in CDF files. For other web services, this variable is may be represented as a time string.'",
          "Units": "ms",
          "Support": {
            "Qualifier": "Scalar",
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Apparent Range",
          "ParameterKey": "ampl",
          "Description": "Master CDF CATDESC: 'Sounder amplitude at 223 virtual heights for fixed & swept frequency'. Master CDF VAR_NOTES: ' '. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": " ",
          "FillValue": -128,
          "Structure": {
            "Size": [
              223
            ]
          }
        },
        {
          "Name": "interpolated frequencies",
          "ParameterKey": "freq",
          "Description": "Master CDF CATDESC: 'Interpolated fixed & sweep frequencies'. Master CDF VAR_NOTES: 'This variable could be used as x-axis on amplitude spectrograms if fixed part is subtracted.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "MHz",
          "FillValue": -1e+31
        },
        {
          "Name": "height",
          "ParameterKey": "height",
          "Description": "Master CDF CATDESC: 'Altitude'. Master CDF VAR_NOTES: 'Virtual variable.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "km",
          "FillValue": -1e+31
        },
        {
          "Name": "Electron Gyrofrequency",
          "ParameterKey": "FH",
          "Description": "Master CDF CATDESC: 'Electron Gyrofrequency'. Master CDF VAR_NOTES: ' '. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "MHz",
          "FillValue": -1e+31
        }
      ]
    }
  }
}