#!/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 25.76594667 57.14898117 -gcp 21537.0 0.0 25.77348483 57.23243088 -gcp 21537.0 23466.0 25.94000941 57.23029511 -gcp 0.0 23466.0 25.94021193 57.14552663 GX10802/GX_10802_SK_frame_386.jpg GX_10802_SK_frame_386.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1008.0 2736.0\n1056.0 19272.0\n20904.0 19368.0\n20664.0 2280.0" | \
  gdaltransform -tps -output_xy GX_10802_SK_frame_386.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10802_SK_frame_386.vrt GX_10802_SK_frame_386.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10802_SK_frame_386.cut.vrt GX_10802_SK_frame_386.xyz