#!/bin/bash

GDAL_TILE_PROCESSES=16
GDAL_TILE_ZOOMS=8-14
GDAL_SAMPLING_WARP=cubic
GDAL_SAMPLING_TILE=antialias

# Create virtual dataset with coordinates
gdal_translate -of VRT -a_srs EPSG:4326 -outsize 300% 300% -gcp 0.0 0.0 22.67351612 56.62762008 -gcp 21600.0 0.0 22.67495513 56.64994542 -gcp 21600.0 21729.0 22.71371841 56.64969767 -gcp 0.0 21729.0 22.71560669 56.6272718 GX4596/GX_4596_SD_frame_55.jpg GX_4596_SD_frame_55.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "17688.0 3024.0\n17568.0 792.0\n2640.0 936.0\n2604.0 2370.0\n888.0 2448.0\n888.0 19656.0\n2760.0 19704.0\n3048.0 21336.0\n21288.0 21312.0\n21120.0 2976.0" | \
  gdaltransform -tps -output_xy GX_4596_SD_frame_55.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4596_SD_frame_55.vrt GX_4596_SD_frame_55.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4596_SD_frame_55.cut.vrt GX_4596_SD_frame_55.xyz