#!/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 25.78406776 57.07360007 -gcp 42708.0 0.0 25.79236462 56.9906663 -gcp 42708.0 42588.0 25.63711246 56.98526873 -gcp 0.0 42588.0 25.62738981 57.06978301 GX220/GX_220_SK_frame_583.jpg GX_220_SK_frame_583.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "426.0 3651.0\n348.0 37908.0\n41976.0 38136.0\n41904.0 3408.0" | \
  gdaltransform -tps -output_xy GX_220_SK_frame_583.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_220_SK_frame_583.vrt GX_220_SK_frame_583.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_220_SK_frame_583.cut.vrt GX_220_SK_frame_583.xyz