#!/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 22.98288881 57.42624257 -gcp 17754.0 0.0 22.92607187 57.40400349 -gcp 17754.0 17817.0 22.88378597 57.43602993 -gcp 0.0 17817.0 22.94372556 57.45745939 GX18588/GX_18588_SK_frame_57.jpg GX_18588_SK_frame_57.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3912.0 2208.0\n3960.0 12840.0\n16296.0 12984.0\n16200.0 1944.0" | \
  gdaltransform -tps -output_xy GX_18588_SK_frame_57.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18588_SK_frame_57.vrt GX_18588_SK_frame_57.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18588_SK_frame_57.cut.vrt GX_18588_SK_frame_57.xyz