冰雪资料的准备
==================

* 实时的北半球1公里分辨率冰雪资料，每天下载一次，资料位置在：

    .. code-block:: bash
        
        https://www.natice.noaa.gov/ims/grib2_v3_p2_2020_4km.html

* 为了可以在 *RAP* 和 *HRRR* 系统中使用，必须做以下操作:

    .. code-block:: bash
    
        # in cron jobs, please do sync as following
        15,30,45,0 * * * * rsync -av /path/of/imssnow/rap.20* ${ROOT_DIR}/com/rap/prod
        # Populate to *rap_e* directory for *HRRR* access
        15,30,45,0 * * * * ${ROOT_DIR}/utils/imssnow_populate.py


        # 请修改如下脚本，设置正确的SNOWICE数据的路径:
        $  ${ROOT_DIR}/nwprod/rap.v4.0.12/scripts/exrap_check_imssnow.sh.ecf
        $  ${ROOT_DIR}/nwprod/rap.v4.0.12/scripts/exrap_analysis.sh.ecf

* *rap* (cyc = 00)

    .. code-block:: bash
    
        exrap_analysis.sh.ecf
        # process_imssnow run after DA

* *hrrr* (cyc = 00)

    .. code-block:: bash
    
        exhrrr_analysis.sh.ecf
        #  process_imssnow run after DA


* :code:`process_imssnow` 修改如下变量：

    1. LU_INDEX
    #. SEAICE
    #. IVGTYP
    #. ISLTYP
    #. SNOW
    #. SNOWH
    #. SNOWC
    #. XLAND
    #. LANDMASK