#!/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 22.39524364 56.6855302 -gcp 21600.0 0.0 22.42408276 56.70352792 -gcp 21600.0 21912.0 22.45616198 56.68913043 -gcp 0.0 21912.0 22.42996216 56.66899772 GX4596/GX_4596_SD_frame_44.jpg GX_4596_SD_frame_44.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1080.0 3288.0\n864.0 19704.0\n21336.0 19800.0\n21378.0 3090.0" | \
  gdaltransform -tps -output_xy GX_4596_SD_frame_44.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4596_SD_frame_44.vrt GX_4596_SD_frame_44.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4596_SD_frame_44.cut.vrt GX_4596_SD_frame_44.xyz