#!/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 24.06828224658966 57.01313127234566 -gcp 21600.0 0.0 24.094042181968693 57.01493618424375 -gcp 21600.0 21852.0 24.097266197204593 57.00095605117516 -gcp 0.0 21852.0 24.07187104225159 56.99902190409678 GX4799/GX_4799_SD_frame_9.jpg GX_4799_SD_frame_9.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 2928.0\n816.0 19584.0\n21192.0 19920.0\n21168.0 2976.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_9.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_9.vrt GX_4799_SD_frame_9.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_9.cut.vrt GX_4799_SD_frame_9.xyz