#!/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 26.11485826 57.0404902 -gcp 21600.0 0.0 26.1182905 57.12391542 -gcp 21600.0 23091.0 26.28320371 57.12433442 -gcp 0.0 23091.0 26.28245227 57.03711294 GX10525/GX_10525_SK_frame_504.jpg GX_10525_SK_frame_504.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1248.0 3024.0\n1320.0 20088.0\n20544.0 20376.0\n20880.0 2712.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_504.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_504.vrt GX_10525_SK_frame_504.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_504.cut.vrt GX_10525_SK_frame_504.xyz