#!/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 23.14595227 56.73361767 -gcp 21600.0 0.0 23.12883607 56.62962135 -gcp 21600.0 20982.0 22.95571433 56.63973148 -gcp 0.0 20982.0 22.95818988 56.7314085 GX2685/GX_2685A_SK_frame_101.jpg GX_2685A_SK_frame_101.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1056.0 2544.0\n936.0 18984.0\n21336.0 19056.0\n21336.0 2304.0" | \
  gdaltransform -tps -output_xy GX_2685A_SK_frame_101.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2685A_SK_frame_101.vrt GX_2685A_SK_frame_101.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2685A_SK_frame_101.cut.vrt GX_2685A_SK_frame_101.xyz