#! /bin/bash

#==============================================================
# <base_url> : base URL of GPM_3IMERGDE data on GES DISC server
#==============================================================
base_url=https://gpm1.gesdisc.eosdis.nasa.gov/data/GPM_L3/GPM_3IMERGDE.07

#-------------------------
# <yyyymmdd> : target date
#-------------------------
if [ $# -lt 1 ]; then
    echo
    echo "#################################"
    echo "#                               #"
    echo "#  parameter <yyyymmdd> needed  #"
    echo "#                               #"
    echo "#################################"
    echo
    exit
fi
yyyymmdd=${1}
yyyy=$(echo ${yyyymmdd} | cut -c1-4)
mm=$(echo ${yyyymmdd} | cut -c5-6)

#----------------------------
# <full_path> : full path URL
#----------------------------
full_path=${base_url}/${yyyy}/${mm}

#-----------------------------------
# <ff> : GPM_3IMERGDE data file name
#-----------------------------------
ff=3B-DAY-E.MS.MRG.3IMERG.${yyyymmdd}-S000000-E235959.V07B.nc4

#------------
# downloading
#------------
wget -q ${full_path}/${ff}

#------------------------------
# list downloaded file (if any)
#------------------------------
echo
if [ -s ${ff} ]; then
    ls -l ${ff}
else
    echo "#### ${ff} not found"
fi
echo

exit