#!/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 26.17812395 57.40237524 -gcp 10059.0 0.0 26.18684649 57.3169218 -gcp 10059.0 10080.0 26.03271604 57.31239204 -gcp 0.0 10080.0 26.02192283 57.39616197 GX8473/GX_8473_SK_frame_216.jpg GX_8473_SK_frame_216.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "672.0 972.0\n9984.0 876.0935933147632\n9864.0 9096.026740947076\n864.0 9120.354317548747" | \
  gdaltransform -tps -output_xy GX_8473_SK_frame_216.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_8473_SK_frame_216.vrt GX_8473_SK_frame_216.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_8473_SK_frame_216.cut.vrt GX_8473_SK_frame_216.xyz