#!/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 25.6644541 56.09324912 -gcp 21600.0 0.0 25.62784704 56.11312347 -gcp 21600.0 22038.0 25.66482031 56.13490797 -gcp 0.0 22038.0 25.70255495 56.11437569 GX4599/GX_4599_SD_frame_136.jpg GX_4599_SD_frame_136.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "804.0 3030.0\n738.0 19758.0\n21360.0 20040.0\n21336.0 2844.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_136.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_136.vrt GX_4599_SD_frame_136.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_136.cut.vrt GX_4599_SD_frame_136.xyz