#!/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 24.40395111 57.44024955 -gcp 21600.0 0.0 24.34860408 57.44725338 -gcp 21600.0 21852.0 24.35996473 57.47669359 -gcp 0.0 21852.0 24.41642547 57.47115186 GX4195/GX_4195_SD_frame_2.jpg GX_4195_SD_frame_2.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "792.0 3456.0\n888.0 19512.0\n21408.0 19752.0\n21216.0 3024.0" | \
  gdaltransform -tps -output_xy GX_4195_SD_frame_2.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4195_SD_frame_2.vrt GX_4195_SD_frame_2.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4195_SD_frame_2.cut.vrt GX_4195_SD_frame_2.xyz