#!/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 25.34818411 56.22273493 -gcp 21600.0 0.0 25.30313373 56.23528892 -gcp 21600.0 21666.0 25.32628655 56.26123072 -gcp 0.0 21666.0 25.37185192 56.24723076 GX1006/GX_1006_SD_frame_178.jpg GX_1006_SD_frame_178.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "888.0 2976.0\n912.0 19560.0\n21408.0 19680.0\n21336.0 2856.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_178.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_178.vrt GX_1006_SD_frame_178.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_178.cut.vrt GX_1006_SD_frame_178.xyz