#!/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 24.75581477 56.67593288 -gcp 21540.0 0.0 24.77697023 56.65074961 -gcp 21540.0 21852.0 24.73111808 56.63800453 -gcp 0.0 21852.0 24.70724971 56.66357386 GX4477/GX_4477R_SD_frame_533.jpg GX_4477R_SD_frame_533.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 2784.0\n840.0 19440.0\n21144.0 19992.0\n21144.0 2832.0" | \
  gdaltransform -tps -output_xy GX_4477R_SD_frame_533.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4477R_SD_frame_533.vrt GX_4477R_SD_frame_533.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4477R_SD_frame_533.cut.vrt GX_4477R_SD_frame_533.xyz