#!/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 24.06521916 57.04689898 -gcp 21381.0 0.0 24.11815524 57.05173669 -gcp 21381.0 20811.0 24.12662029 57.02265426 -gcp 0.0 20811.0 24.0725255 57.01892829 GX4199/GX_4199_SD_frame_129.jpg GX_4199_SD_frame_129.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "792.0 2016.0\n840.0 18720.0\n21072.0 18696.0\n20808.0 2088.0" | \
  gdaltransform -tps -output_xy GX_4199_SD_frame_129.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4199_SD_frame_129.vrt GX_4199_SD_frame_129.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4199_SD_frame_129.cut.vrt GX_4199_SD_frame_129.xyz