#!/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 27.28698304 56.53421207 -gcp 18003.0 0.0 27.34061526 56.5306576 -gcp 18003.0 18003.0 27.33904265 56.49979601 -gcp 0.0 18003.0 27.27829936 56.50097909 GX18012/GX_18012_SK_frame_37.jpg GX_18012_SK_frame_37.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2688.0 2640.0\n2400.0 14640.0\n16536.0 15360.0\n17016.0 2928.0" | \
  gdaltransform -tps -output_xy GX_18012_SK_frame_37.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18012_SK_frame_37.vrt GX_18012_SK_frame_37.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18012_SK_frame_37.cut.vrt GX_18012_SK_frame_37.xyz