#!/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 25.96074364 57.07094679 -gcp 42708.0 0.0 25.96287592 56.98854178 -gcp 42708.0 42588.0 25.80861865 56.9868521 -gcp 0.0 42588.0 25.80499991 57.07074507 GX220/GX_220_SK_frame_586.jpg GX_220_SK_frame_586.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2448.0 3888.0\n2256.0 37584.0\n40032.0 37632.0\n40080.0 3456.0" | \
  gdaltransform -tps -output_xy GX_220_SK_frame_586.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_220_SK_frame_586.vrt GX_220_SK_frame_586.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_220_SK_frame_586.cut.vrt GX_220_SK_frame_586.xyz