#!/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 24.10826307 57.01535365 -gcp 21600.0 0.0 24.06454791 57.00081811 -gcp 21600.0 21729.0 24.03554895 57.0253475 -gcp 0.0 21729.0 24.0820161 57.04020813 GX2200/GX_2200_SD_frame_83.jpg GX_2200_SD_frame_83.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 3120.0\n1104.0 19320.06670372429\n21240.0 19031.666481378543\n21168.0 2975.9466370205673" | \
  gdaltransform -tps -output_xy GX_2200_SD_frame_83.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2200_SD_frame_83.vrt GX_2200_SD_frame_83.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2200_SD_frame_83.cut.vrt GX_2200_SD_frame_83.xyz