#!/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 24.04720656 57.0892839 -gcp 17754.0 0.0 24.08600682 57.05722 -gcp 17754.0 17817.0 24.02741922 57.03494523 -gcp 0.0 17817.0 23.98488464 57.06639037 GX18588/GX_18588_SK_frame_4.jpg GX_18588_SK_frame_4.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3408.0 1920.0\n2808.0 12504.0\n3792.0 12696.0\n12576.0 10200.0\n16272.0 9576.0\n16344.0 1704.0" | \
  gdaltransform -tps -output_xy GX_18588_SK_frame_4.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18588_SK_frame_4.vrt GX_18588_SK_frame_4.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18588_SK_frame_4.cut.vrt GX_18588_SK_frame_4.xyz