#!/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 27.07634211 57.39761249 -gcp 10383.0 0.0 27.08998524 57.31058023 -gcp 10383.0 10476.0 26.9300183 57.30390438 -gcp 0.0 10476.0 26.91551685 57.38946072 GX8473/GX_8473_SK_frame_232.jpg GX_8473_SK_frame_232.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "660.0 1248.0\n9948.0 1031.6857938718663\n9888.0 9191.906406685237\n936.0 9240.0" | \
  gdaltransform -tps -output_xy GX_8473_SK_frame_232.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_8473_SK_frame_232.vrt GX_8473_SK_frame_232.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_8473_SK_frame_232.cut.vrt GX_8473_SK_frame_232.xyz