#!/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 25.05942956 56.93118656 -gcp 43200.0 0.0 25.08158226 57.02794231 -gcp 43200.0 42339.0 25.24524495 57.01262765 -gcp 0.0 42339.0 25.22593372 56.92353549 GX825/GX_825_SK_frame_72_copy_1200_dpi.jpg GX_825_SK_frame_72_copy_1200_dpi.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1488.0 3215.7860724233988\n42288.0 3551.7325905292482\n41880.0 37704.013370473534\n1728.0 37440.267409470755" | \
  gdaltransform -tps -output_xy GX_825_SK_frame_72_copy_1200_dpi.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_825_SK_frame_72_copy_1200_dpi.vrt GX_825_SK_frame_72_copy_1200_dpi.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_825_SK_frame_72_copy_1200_dpi.cut.vrt GX_825_SK_frame_72_copy_1200_dpi.xyz