#!/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 24.049238562583927 56.950287400316704 -gcp 21600.0 0.0 24.07481074333191 56.94976664584095 -gcp 21600.0 22101.0 24.074124097824097 56.935750317036074 -gcp 0.0 22101.0 24.04868066310883 56.93588787237029 GX4799/GX_4799_SD_frame_110.jpg GX_4799_SD_frame_110.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "792.0 2928.0\n1008.0 19296.0\n21168.0 19800.0\n21228.0 2952.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_110.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_110.vrt GX_4799_SD_frame_110.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_110.cut.vrt GX_4799_SD_frame_110.xyz