#!/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 27.31281589 57.40674599 -gcp 18063.0 0.0 27.32415897 57.30582272 -gcp 18063.0 18003.0 27.13928817 57.29932491 -gcp 0.0 18003.0 27.12592264 57.40002797 GX8473/GX_8473_SK_frame_236.jpg GX_8473_SK_frame_236.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2712.0 3216.0\n3000.0 14832.0\n16176.0 15144.0\n16368.0 3024.0" | \
  gdaltransform -tps -output_xy GX_8473_SK_frame_236.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_8473_SK_frame_236.vrt GX_8473_SK_frame_236.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_8473_SK_frame_236.cut.vrt GX_8473_SK_frame_236.xyz