#!/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 25.11532918 57.07150049 -gcp 21600.0 0.0 25.11828092 56.98610064 -gcp 21600.0 21792.0 24.95597616 56.98384242 -gcp 0.0 21792.0 24.95208044 57.07113676 GX220/GX_220_SK_frame_571.jpg GX_220_SK_frame_571.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "612.0 2148.0\n720.0 19008.0\n21168.0 19056.0\n21240.0 1800.0" | \
  gdaltransform -tps -output_xy GX_220_SK_frame_571.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_220_SK_frame_571.vrt GX_220_SK_frame_571.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_220_SK_frame_571.cut.vrt GX_220_SK_frame_571.xyz