#!/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 24.084901765957472 56.94044992400501 -gcp 21600.0 0.0 24.05905237863428 56.94040562632392 -gcp 21600.0 21729.0 24.058677579168748 56.95455974138629 -gcp 0.0 21729.0 24.08497130748299 56.95481824587253 GX4799/GX_4799_SD_frame_35.jpg GX_4799_SD_frame_35.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "888.0 2616.0\n792.0 19560.0\n21192.0 19608.0\n21072.0 2808.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_35.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_35.vrt GX_4799_SD_frame_35.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_35.cut.vrt GX_4799_SD_frame_35.xyz