#!/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 26.06056648 56.7757543 -gcp 21600.0 0.0 26.08098507 56.85716145 -gcp 21600.0 23775.0 26.24604283 56.84722011 -gcp 0.0 23775.0 26.23150052 56.76374802 GX10673/GX_10673_SK_frame_968.jpg GX_10673_SK_frame_968.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1068.0 3960.0\n1032.0 20916.0\n20640.0 20988.0\n20448.0 3696.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_968.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_968.vrt GX_10673_SK_frame_968.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_968.cut.vrt GX_10673_SK_frame_968.xyz