#!/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 24.07047629 56.99021179 -gcp 21381.0 0.0 24.12224293 56.99232173 -gcp 21381.0 20811.0 24.12658811 56.96445619 -gcp 0.0 20811.0 24.07492876 56.96204635 GX4199/GX_4199_SD_frame_139.jpg GX_4199_SD_frame_139.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "648.0 2088.0\n624.0 18840.0\n20736.0 19056.0\n20760.0 2088.0" | \
  gdaltransform -tps -output_xy GX_4199_SD_frame_139.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4199_SD_frame_139.vrt GX_4199_SD_frame_139.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4199_SD_frame_139.cut.vrt GX_4199_SD_frame_139.xyz