#!/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 25.6795764 56.16182108 -gcp 21381.0 0.0 25.70472479 56.18676766 -gcp 21381.0 20811.0 25.75115919 56.17339762 -gcp 0.0 20811.0 25.72540998 56.1467329 GX1006/GX_1006_SD_frame_144.jpg GX_1006_SD_frame_144.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1008.0 2472.0\n624.0 18600.0\n21192.0 18672.0\n21168.0 2376.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_144.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_144.vrt GX_1006_SD_frame_144.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_144.cut.vrt GX_1006_SD_frame_144.xyz