#!/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 24.34091806 57.79272918 -gcp 21381.0 0.0 24.39303875 57.78838301 -gcp 21381.0 20811.0 24.38640833 57.75979966 -gcp 0.0 20811.0 24.33211555 57.76474583 GX4199/GX_4199_SD_frame_122.jpg GX_4199_SD_frame_122.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "624.0 2112.0\n696.0 18936.0\n21144.0 19056.0\n20904.0 2136.0" | \
  gdaltransform -tps -output_xy GX_4199_SD_frame_122.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4199_SD_frame_122.vrt GX_4199_SD_frame_122.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4199_SD_frame_122.cut.vrt GX_4199_SD_frame_122.xyz