#!/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 25.67658305 57.07669171 -gcp 11376.0 0.0 25.67967296 56.98723668 -gcp 11376.0 10980.0 25.51827908 56.98445445 -gcp 0.0 10980.0 25.51390171 57.07495974 GX220/GX_220_SK_frame_581.jpg GX_220_SK_frame_581.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "576.0 1320.0\n10800.0 1175.9866295264624\n10920.0 9648.05348189415\n576.0 9696.066852367687" | \
  gdaltransform -tps -output_xy GX_220_SK_frame_581.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_220_SK_frame_581.vrt GX_220_SK_frame_581.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_220_SK_frame_581.cut.vrt GX_220_SK_frame_581.xyz