#!/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 24.04833077432734 56.93818805629741 -gcp 21600.0 0.0 24.073759317398075 56.93778579091913 -gcp 21600.0 22101.0 24.073369974647054 56.923733470303624 -gcp 0.0 22101.0 24.04786195337546 56.92381867607057 GX4799/GX_4799_SD_frame_112-113.jpg GX_4799_SD_frame_112-113.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1032.0 2688.0\n864.0 10848.0\n20880.0 11208.0\n21048.0 2760.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_112-113.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_112-113.vrt GX_4799_SD_frame_112-113.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_112-113.cut.vrt GX_4799_SD_frame_112-113.xyz