#!/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 23.75039523 56.68091638 -gcp 21600.0 0.0 23.69961021 56.65162379 -gcp 21600.0 21603.0 23.65430921 56.67697139 -gcp 0.0 21603.0 23.69146184 56.7028621 GX2525/GX_2525_SK_frame_4.jpg GX_2525_SK_frame_4.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1056.0 2928.0\n984.0 19464.0\n21516.0 19530.0\n21504.0 2892.0" | \
  gdaltransform -tps -output_xy GX_2525_SK_frame_4.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2525_SK_frame_4.vrt GX_2525_SK_frame_4.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2525_SK_frame_4.cut.vrt GX_2525_SK_frame_4.xyz