#!/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 27.28765407 56.52569777 -gcp 18003.0 0.0 27.34186633 56.52239455 -gcp 18003.0 18003.0 27.33943246 56.49115342 -gcp 0.0 18003.0 27.2796456 56.49294708 GX18012/GX_18012_SK_frame_38.jpg GX_18012_SK_frame_38.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2856.0 2880.0\n2280.0 14712.0\n16296.0 15432.0\n16848.0 3096.0" | \
  gdaltransform -tps -output_xy GX_18012_SK_frame_38.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18012_SK_frame_38.vrt GX_18012_SK_frame_38.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18012_SK_frame_38.cut.vrt GX_18012_SK_frame_38.xyz