#!/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 24.03727128628892 56.968369637048724 -gcp 21600.0 0.0 24.062847729375985 56.9679059824996 -gcp 21600.0 21975.0 24.062120330313764 56.95378971608702 -gcp 0.0 21975.0 24.036585578616645 56.95403756348302 GX4799/GX_4799_SD_frame_63.jpg GX_4799_SD_frame_63.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "888.0 2736.0\n840.0 19512.0\n21384.0 20016.0\n21048.0 2784.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_63.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_63.vrt GX_4799_SD_frame_63.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_63.cut.vrt GX_4799_SD_frame_63.xyz