#!/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 24.072412848472602 56.9947412999199 -gcp 21600.0 0.0 24.047135710716255 56.9920879505163 -gcp 21600.0 21975.0 24.04236137866974 57.005834797247005 -gcp 0.0 21975.0 24.06715571880341 57.00889318182512 GX4799/GX_4799_SD_frame_46.jpg GX_4799_SD_frame_46.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "888.0 3192.0\n984.0 19944.0\n21216.0 19848.0\n21192.0 2976.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_46.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_46.vrt GX_4799_SD_frame_46.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_46.cut.vrt GX_4799_SD_frame_46.xyz