#!/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 22.55438447 56.66648037 -gcp 21600.0 0.0 22.57343888 56.68666747 -gcp 21600.0 21729.0 22.60948777 56.67608901 -gcp 0.0 21729.0 22.59103073 56.65591927 GX4596/GX_4596_SD_frame_51.jpg GX_4596_SD_frame_51.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1080.0 3336.0\n696.0 19608.0\n21288.0 20040.0\n21144.0 3072.0" | \
  gdaltransform -tps -output_xy GX_4596_SD_frame_51.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4596_SD_frame_51.vrt GX_4596_SD_frame_51.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4596_SD_frame_51.cut.vrt GX_4596_SD_frame_51.xyz