#!/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 25.87325335 56.77988843 -gcp 21600.0 0.0 25.88709354 56.86143135 -gcp 21600.0 24024.0 26.05538607 56.85388829 -gcp 0.0 24024.0 26.04210377 56.77060029 GX10673/GX_10673_SK_frame_971.jpg GX_10673_SK_frame_971.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "624.0 3840.0\n792.0 20808.0\n20424.0 20976.0\n20136.0 3672.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_971.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_971.vrt GX_10673_SK_frame_971.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_971.cut.vrt GX_10673_SK_frame_971.xyz