Venus Climate Orbiter Akatsuki Cloud Motion Vector Data Set
===========================================================

  Releases
  --------

    - v1.1
      - Release Date: 2022-12-02
      - Change Log:
        - Added data/uvi_20190212_201512-201812 for data used in
          Horinouchi+2020

    - v1.0
      - Release Date: 2021-12-22

    Data sets used to create this data set:

      - Venus Climate Orbiter Akatsuki UVI Longitude-Latitude Map data
        https://doi.org/10.17597/isas.darts/vco-00016

      - Venus Climate Orbiter Akatsuki IR2 Calibrated Data PDS3 data set
        https://doi.org/10.17597/isas.darts/vco-00009

      - Venus Climate Orbiter Akatsuki SPICE Kernels PDS3 dataset
        https://doi.org/10.17597/isas.darts/vco-00001


  Data Citation
  -------------

    The citation for this data set is as follows:

      Horinouchi, T., S. Murakami, K. Ogohara, T. Kouyama, M. Takagi (2021),
      Venus Climate Orbiter Akatsuki Cloud Motion Vector Data Set v1.0, 
      JAXA Data Archives and Transmission System, 
      https://doi.org/10.17597/isas.darts/vco-00020


  Overview
  --------

    This data set contains cloud motion vector data derived from images
    acquired by the UVI instrument and the IR2 instrument of the Venus
    Climate Orbiter (VCO, also known as PLANET-C and Akatsuki) spacecraft.
    This data set consists of NetCDF files.


  Processing
  ----------

    Cloud tracking program called al3ct was used to derive cloud motion
    vector data from Level 3 data products.

    Please refer Ogohara+2012, Ikegawa and Horinouchi (2016),
    Horinouchi+2017 for the cloud tracking method used to create this
    data set.


  Data
  ----

    Please refer 00README.txt in the 'data/*' subdirectories.


  Filename
  --------

    Please refer 00README.txt in the 'data/*' subdirectories.


  Directory Structure
  -------------------

    Directory structure is as follows:

      00readme.txt                        this file

      data/                               directory for data
      data/${release}/                    directory for each release
      data/${release}/00README.txt        readme for the release

      checksum.txt                        list of checksums

    where

      ${release}:       release directory


    In 'data/' directory, there are subdirectories associated with each
    internal release to the Akatsuki Science Working Team.


  License
  -------

    This data set is distributed under "ISAS Data Policy" (*1). Rules
    described in the policy follow "Government of Japan Standard Terms of
    Use (Version 2.0)" (*2) and are compatible with Creative Commons
    Attribution 4.0 International License (CC BY 4.0) (*3).

    (*1) https://www.isas.jaxa.jp/en/researchers/data-policy/
    (*2) https://www.kantei.go.jp/jp/singi/it2/densi/kettei/gl2_betten_1_en.pdf
    (*3) https://creativecommons.org/licenses/by/4.0/deed.en


  References
  ----------

    - Ogohara, K., T. Kouyama, H. Yamamoto, N. Sato, M. Takagi, T. Imamura (2012),
      Automated cloud tracking system for the Akatsuki Venus climate orbiter data,
      Icarus, 217, 661-668, https://doi.org/10.1016/j.icarus.2011.05.017

    - Ikegawa, S., and T. Horinouchi (2016),
      Improved automatic estimation of winds at the cloud top of Venus
      using superposition of cross-correlation surfaces,
      Icarus, 271, 98-119, https://doi.org/10.1016/j.icarus.2016.01.018

    - Horinouchi, T., S. Murakami T. Kouyama, K. Ogohara, A. Yamazaki,
      M. Yamada, S. Watanabe (2017),
      Image velocimetry for clouds with relaxation labeling based on
      deformation consistency,
      Measurement Science and Technology, 28(8), 085301 (10pp),
      https://doi.org/10.1088/1361-6501/aa695c

    - Horinouchi, T., T. Kouyama, Y. J. Lee, S. Murakami, K. Ogohara,
      M. Takagi, T. Imamura,K. Nakajima, J. Peralta, A. Yamazaki, M. Yamada,
      S. Watanabe (2018),
      Mean winds at the cloud top of Venus obtained from two-wavelength UV
      imaging by Akatsuki,
      Earth, Planets and Space, 70:10, https://doi.org/10.1186/s40623-017-0775-3

    - Horinouchi, T., Y.-Y. Hayashi, S. Watanabe, M Yamada, A. Yamazaki,
      T. Kouyama, M. Taguchi, T. Fukuhara, M. Takagi, K. Ogohara, S. Murakami,
      J. Peralta, S. S. Limaye, T. Imamura, M. Nakamura, T. M. Sato,
      T. Satoh (2020),
      How waves and turbulence maintain the super-rotation of Venus' atmosphere,
      Science, 368, 405-409, https://doi.org/10.1126/science.aaz4439