#!/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 24.078758955001835 56.979134094665014 -gcp 21600.0 0.0 24.05336916446686 56.97737129408386 -gcp 21600.0 21975.0 24.049742817878727 56.99129599975937 -gcp 0.0 21975.0 24.075288176536564 56.993449712993225 GX4799/GX_4799_SD_frame_43.jpg GX_4799_SD_frame_43.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "720.0 3024.0\n840.0 19824.0\n21240.0 20064.0\n21216.0 3000.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_43.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_43.vrt GX_4799_SD_frame_43.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_43.cut.vrt GX_4799_SD_frame_43.xyz