#!/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 23.67178838 56.97769642 -gcp 17754.0 0.0 23.65887172 56.9390908 -gcp 17754.0 17817.0 23.58095994 56.95270271 -gcp 0.0 17817.0 23.6102223 56.98809497 GX18588/GX_18588_SK_frame_18.jpg GX_18588_SK_frame_18.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3360.0 1680.0\n3264.0 12216.0\n16584.0 12336.0\n16404.0 1500.0" | \
  gdaltransform -tps -output_xy GX_18588_SK_frame_18.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18588_SK_frame_18.vrt GX_18588_SK_frame_18.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18588_SK_frame_18.cut.vrt GX_18588_SK_frame_18.xyz