maptiles_concat.sh

# original idea from http://gis.stackexchange.com/questions/73946/automatically-download-and-merge-webmap-tiles-into-one-big-image
# pre-requisite: imagemagick
# ( e.g. sudo apt-get imagemagick )

X1=0
Y1=0
X2=9
Y2=13
Z=4
for x in `seq $X1 $X2`; do
	for y in `seq $Y1 $Y2`; do
		echo "Getting ${x},${y}"
		# padding is necessary because image filename alphabetical ordering is important for montage command
		imgfile=${Z}_$(printf %03d ${y})_$(printf %03d ${x}).jpg
		#URL to pull images from
		curl -s https://www.nps.gov/maps/hfc/park-maps/iatr/brochure-map/TileGroup0/${Z}-${x}-${y}.jpg -o ${imgfile}.jpg &
	done
	wait
done
# the -tile param here is only being passed the x, and derives the y from the number of images
# see http://www.imagemagick.org/Usage/montage/
montage -mode concatenate -tile "$((X2-X1+1))x" "${Z}_*.jpg" iceagetrailmap_${Z}.jpg