#!/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 24.074462056159973 56.97544469507472 -gcp 21600.0 0.0 24.10009860992432 56.97628375862835 -gcp 21600.0 21852.0 24.101734757423404 56.96215456556658 -gcp 0.0 21852.0 24.07604455947876 56.96115139967862 GX4799/GX_4799_SD_frame_16.jpg GX_4799_SD_frame_16.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "636.0 3000.0\n876.0 19812.0\n21120.0 19680.0\n21288.0 2916.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_16.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_16.vrt GX_4799_SD_frame_16.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_16.cut.vrt GX_4799_SD_frame_16.xyz