#!/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 25.7048324 57.04075912 -gcp 43200.0 0.0 25.70455181 57.12478795 -gcp 43200.0 46686.0 25.87079206 57.12670338 -gcp 0.0 46686.0 25.87429048 57.04042529 GX10525/GX_10525_SK_frame_510.jpg GX_10525_SK_frame_510.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3216.0 26256.0\n3504.0 39936.0\n41376.0 40080.0\n41616.0 25536.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_510.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_510.vrt GX_10525_SK_frame_510.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_510.cut.vrt GX_10525_SK_frame_510.xyz