#!/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 27.1951273 57.40952187 -gcp 18063.0 0.0 27.21248375 57.30826391 -gcp 18063.0 18003.0 27.03044863 57.29832901 -gcp 0.0 18003.0 27.0092557 57.39798212 GX8473/GX_8473_SK_frame_234.jpg GX_8473_SK_frame_234.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2592.0 2772.0\n2880.0 14760.0\n14592.0 15240.0\n16296.0 14208.0\n16536.0 2520.0" | \
  gdaltransform -tps -output_xy GX_8473_SK_frame_234.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_8473_SK_frame_234.vrt GX_8473_SK_frame_234.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_8473_SK_frame_234.cut.vrt GX_8473_SK_frame_234.xyz