#!/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 24.076194618398922 56.946686563764786 -gcp 21600.0 0.0 24.101613073829046 56.94786723046999 -gcp 21600.0 21729.0 24.103862416302082 56.93399457688312 -gcp 0.0 21729.0 24.078422187168837 56.93260091942151 GX4799/GX_4799_SD_frame_21.jpg GX_4799_SD_frame_21.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 2880.0\n840.0 19488.0\n21336.0 19560.0\n21216.0 2808.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_21.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_21.vrt GX_4799_SD_frame_21.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_21.cut.vrt GX_4799_SD_frame_21.xyz