#!/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 25.16863349 57.07053022 -gcp 21600.0 0.0 25.17255689 56.98533994 -gcp 21600.0 21792.0 25.01062648 56.98198228 -gcp 0.0 21792.0 25.00641295 57.06946235 GX220/GX_220_SK_frame_572.jpg GX_220_SK_frame_572.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "648.0 2052.0\n684.0 18972.0\n21312.0 19008.0\n21264.0 1632.0" | \
  gdaltransform -tps -output_xy GX_220_SK_frame_572.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_220_SK_frame_572.vrt GX_220_SK_frame_572.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_220_SK_frame_572.cut.vrt GX_220_SK_frame_572.xyz