0 Himawari Scraper

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

himawari8.sh

#!/bin/sh
## 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;
##  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_DIRECTORY="./"
OUTPUT_FILENAME="himawari8.png";
URL_BASE='http://himawari8.nict.go.jp/img/D531106';

## The amount of tiles on one side
## This value should be either 1, 2, 4, or 16
## Each tile is 550px x 550px, so 4 (default) will produce an image 2,200px x 2,200px
TILE_COUNT='4';

DOWNLOAD_LOCK=false;

## Check requirements
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_picture () {
    ## Set download lock
    DOWNLOAD_LOCK=true;

    ## 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';

    ### Check if we're using GNU or BSD
    if date -j >/dev/null 2>&1; then
        ## Get the date for date(1) from BSD utils
        IMAGE_URL="$(date -jf '%Y-%m-%d %H:%M:%S' "${LATEST_FILE}" "${DATE_FORMAT}")";
    else
        ## Get the date for date(1) from GNU utils
        IMAGE_URL="$(date -d "${LATEST_FILE}" "${DATE_FORMAT}")";
    fi;

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

    ## Download each of the files
    echo "Downloading tiles...";
    X=0;
    while [ "${X}" -lt "${TILE_COUNT}" ]; do
        Y=0;
        while [ "${Y}" -lt "${TILE_COUNT}" ]; do
            curl -so "${TMP_IMAGE_DIR}/${Y}_${X}.png" "${URL_BASE}/${TILE_COUNT}d/550/${IMAGE_URL}_${X}_${Y}.png";
            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;

    ## Beautiful code
    printf "\rTiles downloaded."; printf ' %0.s' {0..9}; printf '\n\n';

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

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

    ## Unset download lock
    DOWNLOAD_LOCK=false;

}

download_is_ok () {
    if ${DOWNLOAD_LOCK}; then
        return 1;
    fi    
    
    if [ $(networksetup -getcurrentlocation) = "Home" ]; then
        return 0;
    else
        return 1;
    fi
}

while true; do
    if download_is_ok; then
        get_picture;
    fi
    sleep 1200;
done


exit 0;