Download Google Maps Images

gmaps-dl.sh

#!/bin/bash

function show_help
{
    echo "Usage: $0 (-x xcoord) (-y ycoord) (-l level)"
    echo "       [-r x width] [-s y width] -h for help"
}

if [ $# -le 1 ]; then
    show_help
    exit 1
fi

# A POSIX variable
OPTIND=1         # Reset in case getopts has been used previously in the shell.

## Note !1e0=png !1e3=webp !1e4=bin
G_SAT='https://www.google.com/maps/vt/pb=!1m5!1m4!1i$level!2i[$x-$x1]!3i[$y-$y1]!4i128!2m2!1e1!3i803!3m9!2sid!3sid!5e1105!12m1!1e4!12m1!1e47!12m1!1e3!4e0!5m1!1e0'
G_SAT_1='https://www.google.com/maps/vt/pb=!1m5!1m4!1i$level!2i[$x-$x1]!3i[$y-$y1]!4i128!2m2!1e1!3i803!3m9!2sid!3sid!5e1105!12m1!1e4!12m1!1e47!4e0!1e0'
G_MAP='https://www.google.com/maps/vt/pb=!1m5!1m4!1i$level!2i[$x-$x1]!3i[$y-$y1]!4i128!2m2!1e0!3i429133041!3m7!2sid!3sid!5e1105!12m1!1e47!12m1!1e3!4e0!5m1!1e0'
G_CON_0='https://www.google.com/maps/vt/pb=!1m4!1m3!1i$level!2i[$x-$x1]!3i[$y-$y1]!2m2!1e5!2sshading!2m2!1e6!2scontours!2m3!1e0!2sm!3i429133076!3m7!5e1105!12m1!1e67!12m1!1e63!12m1!1e3!4e0!5m2!5f1!6b1'
G_CON_1='https://www.google.com/maps/vt/pb=!1m4!1m3!1i$level!2i[$x-$x1]!3i[$y-$y1]!2m2!1e5!2sshading!2m2!1e6!2scontours!2m3!1e0!2sm!3i429133076!3m7!5e1105!12m1!1e67!12m1!1e63!5f1!6b1'
SOURCE_URL=$G_SAT
X_WIDTH=10
Y_WIDTH=10
EXT="png"
ANNOTATE=false

while getopts ":x:y:r:s:l:h?" opt; do
    case $opt in
        x  ) x=$OPTARG ;;
        y  ) y=$OPTARG ;;
        l  ) level=$OPTARG ;;
        r  ) X_WIDTH=$OPTARG ;;
        s  ) Y_WIDTH=$OPTARG ;;
        h  ) show_help; exit 0 ;;
        \? ) echo "Invalid option: -$OPTARG" >&2; exit 1 ;;
        :  )  echo "Option -$OPTARG requires an argument." >&2; exit 1 ;;
    esac
done

shift $((OPTIND-1))

if [ -z "$x" -o -z "$y" -o -z "$level" ]; then
   echo "Option -x -y -l required"
   exit 1
fi

echo "x: $x, y: $y, level: $level, xrange: $X_WIDTH, yrange: $Y_WIDTH"

function calculate
{
    let x1=x+$X_WIDTH
    let y1=y+$Y_WIDTH
    eval URL="$SOURCE_URL"
    echo $URL
}
function fetch
{
    echo "==> Downloading"
    curl -C - --output "#1_#2.${EXT}" "$URL"
}
function merge
{
    mkdir 'out'

    if $ANNOTATE; then
        echo "==> Annotating"
        mogrify -gravity South \
                -annotate +0+5 '%f' \
                -pointsize 11 \
                -fill white  \
                -bordercolor '#DFDFDF' \ #grey
                -border 1 *.${EXT}
    fi

    echo "==> Merging"
    for ((c=$x; c<=$x1; c++));
    do
        echo $c
        if [ $x -lt 10 ]; then
            for ((i=0; i<=9; i++));
            do
                echo -n "rename ${c}_${i} ";
                a=${c}_${i}.${EXT};
                j=`echo $a | cut -d _ -f 2` ;
                mv $a `printf ${c}_0${j}`;
            done
        fi
        montage -verbose \
                -mode concatenate \
                -tile 1x ${c}\_*.${EXT} out/${c}.${EXT}
    done

    cd 'out'
    for ((a=0; a<=9; a++)); # $(seq 0 1 9)
    do
        if [ -z ${a}.${EXT} ]; then
            mv ${a}.{EXT} 0${a}.${EXT};
        fi
    done;

    let START_POS=x/10
    let END_POS=x1/10
    let DIFF=$END_POS-$START_POS
    for ((a=START_POS; a<=END_POS; a++));
    do
        montage -verbose \
                -mode concatenate \
                -tile x1 ${a}*.${EXT} F${a}.${EXT}
    done;

    if [ $DIFF -gt 3 ]; then
        let HALF=$START_POS+$DIFF/2
        let NEXT=$HALF+1
        montage -verbose \
                -mode concatenate \
                -tile x1 $(eval echo F{${START_POS}..${HALF}}.${EXT}) L.${EXT}
        montage -verbose \
                -mode concatenate \
                -tile x1 $(eval echo F{${NEXT}..${END_POS}}.${EXT}) R.${EXT}
        montage -verbose \
                -mode concatenate \
                -tile x1 L.${EXT} R.${EXT} FINAL.${EXT}
    else
        montage -verbose \
                -mode concatenate \
                -tile x1 $(eval echo F{${START_POS}..${END_POS}}.${EXT}) FINAL.${EXT}
    fi
    cd ".."
    echo "==> Done merging"
}

function cleanup
{
    echo "==> Cleanup"
    mkdir "source"
    mv *.${EXT} source/
    mv out/FINAL.${EXT} .
    convert -resize 1366x\>  FINAL.${EXT} RE1000.${EXT}
}

function main
{
    mkdir "${level}-${x}-${y}"
    cd "${level}-${x}-${y}"
    calculate
    fetch
    merge
    cleanup
}

main