#!/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 25.62579463 56.0168855 -gcp 21600.0 0.0 25.57559945 56.0214784 -gcp 21600.0 22038.0 25.58244392 56.05136528 -gcp 0.0 22038.0 25.63604802 56.04664137 GX4599/GX_4599_SD_frame_133.jpg GX_4599_SD_frame_133.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "912.0 2832.0\n984.0 19656.0\n21480.0 19872.0\n21468.0 2598.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_133.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_133.vrt GX_4599_SD_frame_133.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_133.cut.vrt GX_4599_SD_frame_133.xyz