Download map tiles from a tile server and stitch them together into a single image. An alternative to taking a screenshot of google maps.

map-download.sh

# Download map tiles from a tile server and stitch them together into a single image
# An alternative to taking a screenshot of google maps

# Edit the settings below and then run ./map-download.sh
# To find the z, x, and y coordinates that you want, this tool might be useful:
# https://github.com/skyqrose/coordinates-tile-server

# Requires ImageMagick's convert command to assemble the images
# Note that ImageMagick has security vulnerabilities when working with untrusted files
# So there's some risk to using this with untrusted tileservers

# Map settings
URL="https://a.tile.openstreetmap.org/{z}/{x}/{y}.png"
ZOOM=14
STARTX=4957
ENDX=4958
STARTY=6059
ENDY=6060

# Where files will be downloaded to and combined
# Downloads to filenames based on the coordinates $x or $x-$y, e.g. 4957 or 4957-6059
# So don't run this where similarly named files might be overwritten
DIRECTORY=.
OUTPUTFILE=out

cd $DIRECTORY\
|| { echo "directory $DIRECTORY does not exist"; exit 1; }
z=$ZOOM
xs=$(seq $STARTX $ENDX)
ys=$(seq $STARTY $ENDY)
for x in $xs
do
  colfiles=
  for y in $ys
  do
    url=$URL
    url=${url//\{z\}/$z}
    url=${url//\{x\}/$x}
    url=${url//\{y\}/$y}
    echo wget -q -O $x-$y $url
    wget -q -O $x-$y $url\
    || { echo "failed to fetch tile $url"; exit 2; }
    colfiles="$colfiles $x-$y"
  done
  echo convert $colfiles -append $x
  convert $colfiles -append $x\
  || { echo "failed to join column at x=$x"; exit 3; }
  echo rm $colfiles
  rm $colfiles
done
echo convert $xs +append $OUTPUTFILE
convert $xs +append $OUTPUTFILE\
|| { echo "failed to join columns together"; exit 4; }
echo rm $xs
rm $xs
echo done. output is at $DIRECTORY/$OUTPUTFILE