#!/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 23.7873733 56.64891026 -gcp 21600.0 0.0 23.75845588 56.62516458 -gcp 21600.0 22038.0 23.71374719 56.6411659 -gcp 0.0 22038.0 23.74280473 56.66578978 GX4598/GX_4598_SD_frame_171.jpg GX_4598_SD_frame_171.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "816.0 3168.0\n768.0 19728.0\n21216.0 19920.0\n21240.0 3192.0" | \
  gdaltransform -tps -output_xy GX_4598_SD_frame_171.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4598_SD_frame_171.vrt GX_4598_SD_frame_171.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4598_SD_frame_171.cut.vrt GX_4598_SD_frame_171.xyz