#!/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 25.81141233 56.41553347 -gcp 21600.0 0.0 25.76008185 56.4164473 -gcp 21600.0 22038.0 25.76027003 56.44659866 -gcp 0.0 22038.0 25.81484506 56.44621158 GX4599/GX_4599_SD_frame_146.jpg GX_4599_SD_frame_146.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "660.0 2664.0\n696.0 19464.0\n21480.0 19728.0\n21264.0 2568.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_146.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_146.vrt GX_4599_SD_frame_146.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_146.cut.vrt GX_4599_SD_frame_146.xyz