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0 Himawari Scraper

Example: https://denpa.moe/~syrup/himawari8.png 

himawari8.sh

#!/usr/bin/env bash

## This script downloads an image of earth from Japan's Himawari8 satellite.
## It is configurable for 1,100^2, 2,200^2, or 8,800^2 pixel outputs.
## It requires;
##  aria2c(1) from https://aria2.github.io/
##  montage(1) from imagemagick (http://www.imagemagick.org/)
##  date(1) from either BSD or GNU utils
##  curl(1) from http://curl.haxx.se/
##  jq(1) from https://stedolan.github.io/jq/

## Configuration
OUTPUT_DIR='/Users/adriel/Downloads'
TMP_DIR="$TMPDIR"
URL_BASE='https://himawari8-dl.nict.go.jp/himawari8/img/D531106';
## The amount of tiles on one side
## This value should be either 1, 2, 4, 16 or 20
## Each tile is 550px x 550px, so 4 (default) will produce an image 2,200px x 2,200px
TILE_COUNT='20';

## Check requirements
## TODO Add check for gdate (GNU date (for Mac))
if ! aria2c --version >/dev/null 2>&1; then
    echo "aria2c(1) is not installed, but is required by this script.";
    echo "Please see installation instructions at https://aria2.github.io/";
    exit 1;
fi;
if ! jq --version >/dev/null 2>&1; then
    echo "jq(1) is not installed, but is required by this script.";
    echo "Please see installation instructions at https://stedolan.github.io/jq/";
    exit 1;
fi;
if ! curl --version >/dev/null 2>&1; then
    echo "curl(1) is not installed, but is required by this script.";
    echo "Please see installation instructions at http://curl.haxx.se/";
    exit 1;
fi;
if ! montage --version >/dev/null 2>&1; then
    echo "montage(1) from ImageMagick is not installed, but is required by this script.";
    echo "Please see installation instructions at http://www.imagemagick.org/";
    exit 1;
fi;
if ! date >/dev/null 2>&1; then
    echo "date(1) is not installed, but is required by this script.";
    echo "Please get a copy for your OS from either GNU or BSD utils.";
    exit 1;
fi;

## Get the latest picture
LATEST_FILE="$(curl -s "${URL_BASE}/latest.json" | jq -r -e .date)";
if [ "$?" -ne 0 ]; then
    echo "Unable to get latest picture date";
    exit 1;
fi;

## Parse the date into the filename
DATE_FORMAT='+%Y/%m/%d/%H%M%S';
IMAGE_URL="$(gdate -d "${LATEST_FILE}" "${DATE_FORMAT}")";
IMAGE_CAP_DATE="$(gdate -d "${LATEST_FILE}" "+%F %T")";

sec=$(TZ="UTC" gdate +'%s' -d "$IMAGE_CAP_DATE");
NZ_DATE=$(TZ="Pacific/Auckland" gdate -d "@$sec" "+%Y-%m-%d %I.%M%p %Z");
OUTPUT_FILENAME="${NZ_DATE}_himawari8.png";
echo -e "GMT: $IMAGE_URL \nNZT: $NZ_DATE";

## Make the directory for the images
TMP_IMAGE_DIR="$(mktemp -d "${TMP_DIR}/himawari8.XXXXXXXX")";

## Download each of the files
echo "Downloading tiles...";
> "${TMP_IMAGE_DIR}/dl_list.txt";
X=0;
while [ "${X}" -lt "${TILE_COUNT}" ]; do
    Y=0;
    while [ "${Y}" -lt "${TILE_COUNT}" ]; do
		## Add leading 0's to X & Y to keep images in A-Z order
		PADDED_X=$(printf "%02d\n" $X);
		PADDED_Y=$(printf "%02d\n" $Y);
		# https://himawari8-dl.nict.go.jp/himawari8/img/D531106/20d/550/2019/08/20/084000_0_7.png
		echo -e "${URL_BASE}/${TILE_COUNT}d/550/${IMAGE_URL}_${X}_${Y}.png \n out=sat_${PADDED_Y}_${PADDED_X}.png" >> "${TMP_IMAGE_DIR}/dl_list.txt"
        printf "\rDownloaded ${X}, ${Y} ($((X * TILE_COUNT + Y + 1)) / $((TILE_COUNT * TILE_COUNT)))";
        printf ' %0.s' {0..9};
        Y="$((Y+1))";
    done;
    X="$((X+1))";
done;

## Concurrent download images
aria2c --max-concurrent-downloads=50 -i "${TMP_IMAGE_DIR}/dl_list.txt" -d "$TMP_IMAGE_DIR" -q;

## Beautiful code
printf "\rTile links generated."; printf ' %0.s' {0..9}; printf '\n\n';

## Create the image
echo "Creating image...";
montage "${TMP_IMAGE_DIR}/"*.png -geometry 550x550 "${OUTPUT_DIR}/${OUTPUT_FILENAME}" >/dev/null 2>&1;
# gm montage "${TMP_IMAGE_DIR}/"*.png -geometry 550x550 "${OUTPUT_DIR}/${OUTPUT_FILENAME}";
echo "Image created: ${OUTPUT_DIR}/${OUTPUT_FILENAME}";
open "${OUTPUT_DIR}/${OUTPUT_FILENAME}"

## Remove the temporary directory
if [ -n "${TMP_IMAGE_DIR}" ]; then
    rm "${TMP_IMAGE_DIR}/"*.png;
	rm "${TMP_IMAGE_DIR}/dl_list.txt";
	rmdir "${TMP_IMAGE_DIR}";
fi;

exit 0;