#!/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 24.08962150598736 56.91085643209123 -gcp 21600.0 0.0 24.064564325988044 56.91014604737007 -gcp 21600.0 21975.0 24.063015561883432 56.9241035826045 -gcp 0.0 21975.0 24.088439389370812 56.92501673319753 GX4799/GX_4799_SD_frame_72.jpg GX_4799_SD_frame_72.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "864.0 2784.0\n768.0 19560.0\n21336.0 19824.0\n21120.0 2712.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_72.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_72.vrt GX_4799_SD_frame_72.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_72.cut.vrt GX_4799_SD_frame_72.xyz