NSIDC recommended changes to the v2 mosaics

[mliukis]

Please follow NSIDC recommendations to change v2 mosaics format to prepare data for NSIDC ingestion.

[mliukis]

Format changes to implement per NSIDC suggestions:

All mosaics

• Global attributes:
  • Add :publisher_name = "NASA National Snow and Ice Data Center Distributed Active Archive Center"
  • Add :citation = "Gardner, A. S., Fahnestock, M., Greene, C. A., Kennedy, J. H., Liukis, M., & Scambos, T. 2024. MEaSUREs ITS_LIVE Regional Glacier and Ice Sheet Surface Velocities, Version 2 [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https//:doi.org/10.5067/JQ6337239C96. [Date accessed]."
  • Add :Conventions = "CF-1.8"
  • Replace
    :latitude = "[59.42, 60.11, 62.72]"; and
    :longitude = "[-146.05, -159.66, -130.11]";
    with
    :geospatial_bounds = "POLYGON((lat1 lon1, lat2 lon2,...))"; and
    :geospatial_bounds_crs= "EPSG:4326";
    • Note: won't apply the change as we are removing latitude and longitude attributes from mosaics
  • Change value of :title = "ITS_LIVE summary mosaics of image pair velocities"; to
    :title = "MEaSUREs ITS_LIVE Regional Glacier and Ice Sheet Surface Velocities, Version 2";
  • Note: won't combine url and s3 attributes into references for the sake of the users (easier to parse)
• mapping attributes:
  • Change datatype to double for :scale_factor_at_projection_origin = 1.0; // double
• floatingice, landice attributes:
  • Change dtype to ubyte for :flag_values = 0L, 1L; // long
  • Change :url = "https://its-live-data.s3.amazonaws.com/autorift_parameters/v001/NPS_0120m_floatingice.tif"; to
    :references = "https://its-live-data.s3.amazonaws.com/autorift_parameters/v001/NPS_0120m_floatingice.tif";

Static mosaics:

• count attributes:
  • Change attribute name note to comment
  • Change value of :standard_name = "count"; to
    :standard_name = "number_of_observations";
• dv[xy]_dt attributes:
  • Change value of :standard_name = "dv*_dt"; to "trend [2014-2022] in v*"
• sensor (note: each mission group value is consistent across all mosaics, but not all mosaics will have data for each of the mission group):
  • Change dtype to ubyte: ubyte sensor(sensor=5);
  • Add :flag_values = 1B, 2B, 3B, 4B, 5B; // ubyte
  • Add :flag_meanings = "L4_L5 L7 L8_L9 S1A_S1B S2A_S2B";
• v:
  • Change value for :standard_name = "climatological_velocity"; to
    "climatological [2014-2022] velocity";
  • Change value: :description = "determined by taking the hypotenuse of vx and vy. The climatology uses a time-intercept of January 1, 2018.";
• v_amp:
  • Change value for :standard_name = "v_amplitude"; to
    "climatological [2014-2022] mean seasonal amplitude"
• v_amp_error:
  • Change value for :standard_name = "v_amplitude_error"; to "v_amp error"
• v_error:
  • Change value for :standard_name = "v_velocity_error"; to "v error"

Annual mosaics

• v attributes:
  • Change value for :standard_name = "velocity"; to "mean annual velocity"
• v[*]_error attributes:
  • Change value for :standard_name = "[*_]velocity_error"; to v* error