#!/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 24.075433015823364 56.985456676717575 -gcp 21600.0 0.0 24.101144671440128 56.986082153517124 -gcp 21600.0 21852.0 24.1022926568985 56.971947906139576 -gcp 0.0 21852.0 24.07657027244568 56.97119061512326 GX4799/GX_4799_SD_frame_14.jpg GX_4799_SD_frame_14.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "576.0 2784.0\n756.0 19620.0\n21168.0 19800.0\n21120.0 2880.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_14.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_14.vrt GX_4799_SD_frame_14.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_14.cut.vrt GX_4799_SD_frame_14.xyz