#!/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 23.07691841 57.39451903 -gcp 17754.0 0.0 23.04022458 57.36253566 -gcp 17754.0 17817.0 22.97931882 57.38475682 -gcp 0.0 17817.0 23.0190022 57.41439539 GX18588/GX_18588_SK_frame_53.jpg GX_18588_SK_frame_53.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3408.0 1896.0\n3216.0 13008.0\n16416.0 12936.0\n16272.0 1776.0" | \
  gdaltransform -tps -output_xy GX_18588_SK_frame_53.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18588_SK_frame_53.vrt GX_18588_SK_frame_53.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18588_SK_frame_53.cut.vrt GX_18588_SK_frame_53.xyz