#!/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 24.074950218200687 56.963976573310006 -gcp 21600.0 0.0 24.100549221038822 56.96495626914215 -gcp 21600.0 21729.0 24.10260379314423 56.95098075619532 -gcp 0.0 21729.0 24.076913595199585 56.94971983616462 GX4799/GX_4799_SD_frame_18.jpg GX_4799_SD_frame_18.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 2952.0\n792.0 19728.0\n21072.0 19872.0\n21168.0 2844.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_18.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_18.vrt GX_4799_SD_frame_18.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_18.cut.vrt GX_4799_SD_frame_18.xyz