#!/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 26.70244192 57.40214022 -gcp 18063.0 0.0 26.70889133 57.30068056 -gcp 18063.0 18003.0 26.52461866 57.29756078 -gcp 0.0 18003.0 26.51571174 57.39799011 GX8473/GX_8473_SK_frame_225.jpg GX_8473_SK_frame_225.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2328.0 2976.0\n2928.0 15096.0\n16224.0 14856.0\n16152.0 2544.0" | \
  gdaltransform -tps -output_xy GX_8473_SK_frame_225.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_8473_SK_frame_225.vrt GX_8473_SK_frame_225.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_8473_SK_frame_225.cut.vrt GX_8473_SK_frame_225.xyz