#!/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 24.03755754232407 56.94496832849565 -gcp 21600.0 0.0 24.062703849030868 56.943838106795546 -gcp 21600.0 21975.0 24.06067833750082 56.92983910861161 -gcp 0.0 21975.0 24.03537690639496 56.93088287326589 GX4799/GX_4799_SD_frame_67.jpg GX_4799_SD_frame_67.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "816.0 2808.0\n744.0 19704.0\n21264.0 20280.0\n21120.0 2856.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_67.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_67.vrt GX_4799_SD_frame_67.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_67.cut.vrt GX_4799_SD_frame_67.xyz