#!/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 24.04014050960541 57.036967736794125 -gcp 21600.0 0.0 24.0658575296402 57.03967333221642 -gcp 21600.0 21852.0 24.07113611698151 57.02571126243701 -gcp 0.0 21852.0 24.045086503028873 57.02253746494162 GX4799/GX_4799_SD_frame_94.jpg GX_4799_SD_frame_94.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1032.0 2760.0\n816.0 19656.0\n21216.0 19680.0\n21096.0 2904.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_94.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_94.vrt GX_4799_SD_frame_94.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_94.cut.vrt GX_4799_SD_frame_94.xyz