#!/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 24.05128241 57.05011446 -gcp 21381.0 0.0 24.10228729 57.05688882 -gcp 21381.0 20811.0 24.11506534 57.02861036 -gcp 0.0 20811.0 24.06205416 57.02278274 GX4199/GX_4199_SD_frame_128.jpg GX_4199_SD_frame_128.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "648.0 1992.0\n744.0 18600.0\n20856.0 18864.0\n20976.0 2064.0" | \
  gdaltransform -tps -output_xy GX_4199_SD_frame_128.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4199_SD_frame_128.vrt GX_4199_SD_frame_128.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4199_SD_frame_128.cut.vrt GX_4199_SD_frame_128.xyz