#!/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 26.16788682 57.03844609 -gcp 21600.0 0.0 26.17304559 57.12311858 -gcp 21600.0 23091.0 26.33703278 57.12246049 -gcp 0.0 23091.0 26.3376854 57.03629399 GX10525/GX_10525_SK_frame_503.jpg GX_10525_SK_frame_503.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1248.0 3336.0\n1032.0 20352.0\n20592.0 20592.0\n20808.0 3108.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_503.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_503.vrt GX_10525_SK_frame_503.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_503.cut.vrt GX_10525_SK_frame_503.xyz